On the afternoon of October 27, 2009, at the China Superhard Materials Technology Development Forum organized by the Superhard Materials Branch of China Machine Tool Industry Association, 25 experts and scholars preached the economic operation situation and technical research of the superhard materials industry. Academic papers. The papers covered include the development of the super-hard materials industry, super-hard abrasives and related materials, super-hard materials and applications, raw and auxiliary materials, testing and equipment, management and teaching and research, and a comprehensive and complete response. The technical level of China's superhard materials industry.
The summary of the speeches of various experts and scholars is now published as follows. I wish that China's super-hard materials industry will catch up with the world's advanced level and realize the great goal of super-hard materials. The technical forum in the first half of the afternoon of the 27th was presided over by Professor Wang Qinsheng, deputy director of the Expert Committee of Superhard Materials.
Topic 1: "A Brief Analysis of the Economic Operation Situation of Superhard Materials Industry in 2008". Speaker: Li Zhihong Abstract of the paper:
This paper analyzes the economic operation situation of China's superhard materials industry affected by the economic crisis. The growth rate of major economic indicators fell sharply, but the product structure improved significantly and the overall economy was still operating at a high level. Enterprises with high product quality, diversified market and domestic sales are less affected, and the growth rate of major economic indicators is still above 15%. The main products have been recognized by more and more international merchants, and the number and geographical scope of exports have expanded rapidly. Although the technology and product levels have been greatly improved, they have not been well reflected in the international market, and products from developed countries still dominate the high-end market. Improving the ability of independent innovation and vigorously adjusting the industry and product structure are still the direction that the industry's ambitions need to work hard.
Topic 2: "Pre-alloyed powder technology and research and development of Fe-based prealloyed powder". Speaker: Fang Xiaohu Abstract:
Pre-alloyed powder is a very important advanced technology in the current diamond tool manufacturing. This paper focuses on the performance and application characteristics of the latest pre-alloyed powders at home and abroad, and introduces new developments in the preparation and application of iron-based and alloy powders.
Topic 3: "Diamond Metal (Diamond Gold) Composites: Thermal Transmissive Interface for Computer Chips." Speaker: Yuan Zhizhong Abstract:
Industrial diamond abrasive particles can be infiltrated with copper or aluminum to form diamond metal (drilled gold) heat sinks. This composite material not only has a much higher thermal conductivity than the existing copper heat sink, but its thermal expansion rate can be adjusted to be synchronized with the semiconductor chip. In this way, the gold heat sink can be directly soldered to the chip to prevent the heat flow from being blocked by the heat sink. This article not only describes the design concept of the diamond heat sink, but also provides a lot of measured results, and recommends a low-cost manufacturing method as a reference to avoid the temperature loss of the computer CPU chip in the future.
Topic 4: "The world market status of gem-quality synthetic diamonds". Speaker: Yuan Zhizhong Abstract:
This paper introduces the current market situation of gem-quality synthetic diamonds, introduces HPHT synthetic diamonds and their identification methods, and details the methods of chemical vapor deposition (CVD) synthetic diamonds and the color, clarity and identification of them. The advantages of CVD synthesis and market application prospects. The technical forum for the second half of the afternoon on the 27th was hosted by Sun Yichao.
Topic 5: Research Progress in Boron-Based Superhard Materials. Speaker: 寇 自力 Abstract:
The design and synthesis of superhard materials is one of the hot topics in the field of materials science research. In recent years, due to the development of superhard material design theory, people have been experimentally and theoretically looking for materials with hardness close to or even exceeding diamond. This paper reviews the research status of boron-based materials such as BN, BxN, BxC, BxO, and BxCyNz in recent years, and introduces the latest research progress of strong incompressible material MxBy (M-transition metal) as a possible superhard material.
Topic 6: "Completion and Improvement of PCD/PCBN Performance for Cutting". Speaker: Jiang Rongchao Abstract of the paper:
This paper briefly introduces the development of PCD/PCBN, describes its grade and performance, and explores ways to improve and improve its quality and performance.
Topic 7: "Superhard Composites of SPS Sintered Diamond and Sialon Ceramics". Speaker: Wang Mingzhi Speech Summary:
In this paper, Sialon ceramics is used as a binder to sinter diamond ceramic composites using SPS technology. Through the formulation adjustment and optimization, the obtained sintered body has a dense and well-bonded structure under the condition of 1200 ° C + 50 MPa + 5 min heat preservation, and the diamond has no obvious graphitization.
Topic 8: "Structural Measurement of Composite Diamond Layers". Speaker: Hao Zhaoyin Speech Summary:
Due to the reaction of the diamond particles with the W and Co metals under high temperature and high pressure, the diamond layer of the composite sheet has a complicated structure. Electron microscopy and X-ray diffraction measurements show that in the diamond layer, in addition to the main diamond structure, there are WC, Co3, W3C, WC1-x structures, etc., and the morphology of the interconnected diamond particles is observed. It is important to understand the wear resistance of the composite sheet. Topic 9: Raman Spectra of Different Types of Cubic Boron Nitride Crystals. Speaker: Lu Zhanling's speech summary: The different types of cubic boron nitride (cBN) crystals were synthesized by Raman spectroscopy. The results show that the Raman spectra are significantly different and can be divided into several types: (1) typical cBN In the Raman spectrum, there are only two Raman peaks corresponding to cBN To and Lo modes, which are located at 1055 cm-1 and 1305 cm-1, respectively; (2) in addition to the characteristic peaks of cBN, at 925 cm-1, 955 cm-1 and 1245 cm- An extra peak appears around 1; (3) there is a peak of cBN To mode, but the peak corresponding to the Lo mode disappears, and an asymmetrical broad peak appears around 1286 cm-1. In addition, a plurality of additional peaks appeared at 760 cm-1, 920 cm-1, and 1015 cm-1. (4) A broad peak with a peak shape asymmetry appeared around 1286 cm-1, and the peak corresponding to the To mode has a large displacement. The Raman spectrum has a strong background from the low wave number end to the high wave number end. The reasons for these Raman peaks were analyzed and discussed.
Topic 10: "Study on the application of nano-diamonds to the polishing of sapphire substrates." Speaker: Liu Xueyu Speech Summary:
Sapphire is an important substrate for the epitaxial growth of gallium nitride. The C(001) oriented sapphire substrate was polished with nano-diamonds with Dmax≤100nm and D50 of 53.9nm, and compared with the polishing effect of SiO2. The results show that the polishing mechanism is different. The nano-diamond can quickly eliminate scratches in the polishing process, and obtain a smooth surface of 0.157 nm (AFM: 20 μm × 20 μm), but cannot effectively eliminate scratches in the polishing process. The polishing efficiencies of nanodiamond and SiO2 were 142 nm/min and 70.49 nm/min, respectively.
Lecture 11: "Effect of Cubic Boron Nitride Content on Properties of Polycrystalline Boron Nitride Composite Sheets". Speaker: Xie Hui Speech Abstract:
In this paper, the effect of cubic boron nitride (cBN) content on the sintering condition and properties of polycrystalline cubic boron nitride (PCBN) composite sheets was investigated. The phase analysis, microstructure observation, hardness test and conductivity test of PCBN composite sheets with different cBN contents were carried out. The results show that the phase of PCBN composites with different cBN content is different. With the increase of cBN content, the direct contact area between cBN particles and particles increases, the hardness of PCBN composite sheet increases, and the conductivity decreases. At the same time, the mechanism of the influence of cBN content on the performance of PCBN composite sheets was analyzed. Speech summary:
The few examples provided in this paper are sufficient to demonstrate the position and role of CVD diamond films in modern technology and industry. This is only the clue of the industrial application of CVD diamond film. More mystery needs to be explored, discovered and mastered. At the same time, it is pointed out that although there are still many technical problems that are not ideally solved, the application range of CVD diamond films is expanding day by day.
Topic 13: "Research on the Manufacturing Process of Diamond Ring Band Saw Blade for Silicon Crystal Cutting". Speaker: Zhan Zhibin Speech Summary:
In this paper, the technology, process, testing and environmental protection aspects of the manufacture of diamond ring band saw blades for single crystal silicon rod/polycrystalline silicon ingot cutting are introduced. The electrode band saw blade is made by electrodeposition method, and the steel material with good toughness and high strength is selected as the base material. Combined with high-quality diamond, the geometrical dimensions, yaw and runout of the base are strictly controlled, the surface of the diamond is treated, and the particle size is reformed. In the middle, the exclusive design of the rotating device is adopted, and the most advanced hourly parameter (Ah) measurement and control is introduced, and the band saw blade is manufactured with stable performance, long service life and high precision. In the subsequent treatment, the design adopted a zero-emission process and treated with wastewater generated by the membrane separation technology team. For low-concentration exhaust gas, the full sealing air exhaust channel is combined with the SDG composite adsorbent, and the purification efficiency can reach 98%, ensuring the national environmental protection requirements.
Topic 14: Characterization of the Microstructure of Nano-Diamond/Nickel Composite Brush Plating. Speaker: Zhao Mengyue Speech Summary:
A common fast nickel coating and a diamond/nickel composite brush coating were prepared on the basis of 45# steel, which was compared by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and metallographic microscope. The microstructure of the two coatings was investigated. The results of SEM analysis showed that the surface of the nano-composite brush coating was in the shape of a typical “cauliflower headâ€, and the dispersed nano-diamonds were wrapped by nickel. Compared with ordinary fast nickel, the mass fraction of the characteristic element C of the nano-particles in the diamond/nickel composite brush coating is 7.37%. The XRD analysis shows that the coating gradually changes to the amorphous state with the increase of the amount of nano-diamond added. The particle size gradually decreases.
Topic 15: Research on the grinding performance of nano-SiO2 modified diamond flexible grinding wheel. Speaker: Liu Zhihuan Speech Abstract:
In this paper, the effects of ultrasonic dispersion time and nano-addition on the mechanical properties of resin adhesives for flexible grinding wheels were studied. It was determined that the nano-SiO2 content was increased by 4% and 7% when it was 3%. After adding W40 diamond to the compound ratio of 2:1, the tensile strength of the adhesive modified by 3% nano-SiO2 was increased by 40%, the tensile shear strength was increased by 36%, and the diamond prepared by resin adhesive modified by 3% nano-SiO2 was prepared. The grinding performance of the flexible grinding wheel is greatly improved compared with the unmodified one, and the correspondingness of the mechanical properties of the adhesive and the grinding performance of the diamond flexible grinding wheel is also proved.
Topic 16: "Impact of Pre-Alloyed Powder Oxygen Content on the Microstructure and Properties of Diamond Tools". Speaker: Dong Shushan Speech Summary:
The oxygen content has an important influence on the properties and applications of the atomized prealloyed powder. Reducing the oxygen content is beneficial to activating the interface of the powder particles, lowering the sintering temperature, increasing the degree of densification of the sintered carcass, and improving the mechanical holding force of the carcass to the diamond, thereby improving the comprehensive performance of the diamond tool. In this paper, the influence of oxygen content on the sharpness and service life of diamond saw blade is studied. The suitable oxygen content range is determined to be 2500~4800ppm.
Topic 17: "The Effect of Pre-Alloy Composition and Sintering Process on the Sharpness of Saw Blades". Speaker: Dong Shushan Speech Summary:
In this paper, the effects of alloying elements Fe, Cu, Ni and Sn in iron-based (Fe-Cu) water atomized prealloyed powders and their effects on matrix microstructure, diamond holding power and saw blade sharpness are discussed. The computer optimization design method adjusts the formula combination, comprehensively analyzes the influence of alloy composition and sintering process on the sharpness of stone cutting saw blade, and discusses the technical way to improve the comprehensive performance of saw blade.
Lecture 18: "Research on Improving the Performance of Diamond Wire Saws for Reinforced Concrete Cutting". Speaker: Meng Yunkai Speech summary:
By analyzing the common problems in the process of sawing reinforced concrete by diamond wire saw, some technical problems to be solved in the development of diamond wire saw are pointed out. By adopting corresponding measures, the sawing efficiency is high and the quality is stable and reliable. A diamond wire saw for reinforced concrete cutting with low manufacturing costs. Topic 19: "Development and Application of New Diamond Composite Drill Bits". Speaker: Chen Jinliang Speech Summary:
This paper gives a detailed description of the structural characteristics and performance influencing factors of diamond composite sheets and composite drill bits, and analyzes the impact on the overall performance of diamond composite sheets. On this basis, combined with the use of the construction site, the characteristics of the diamond composite drill bit and the impregnated diamond drill bit were compared. It is proved that under certain formation conditions, the composite drill bit is a new type, longevity and high efficiency instead of the impregnated diamond drill bit. The economical drill bit can be widely used in underground coal mine geological exploration, gas drainage, discharge water, bolts and other drilling, as well as soft and hard rock drilling of various types of exploration drilling on the ground.
Topic 20: "Automated Production of Vacuum Brazed Diamond Tools". Speaker: Xie Tao Speech Abstract:
According to the process characteristics of vacuum brazing diamond tools, the relationship between diamond particle size, distribution density and amount of brazing filler metal in single-layer brazing process is studied. A vacuum brazing diamond automatic cloth distributing device and process are introduced. Automated production of brazed diamond tools is achieved by completing the uniform distribution of diamond and braze at one time.
Topic 21: Diamond Grinding Blocks for Ceramic Tile Polishing. Speaker: Liu Xuejing Speech Abstract:
This paper briefly introduces the structure and manufacturing process of diamond grinding blocks, and analyzes the characteristics of diamond grinding blocks from the aspects of optimizing labor conditions, energy saving, environmental protection and cost, and discusses the factors affecting the polishing effect of diamond grinding blocks and puts forward some improvements. Measures, looking forward to the development direction of diamond grinding blocks.
Topic 22: Experimental Research on Precision Grinding of Li-Ti Ferrite Ceramics. Speaker: Zhan Weiqiang Speech summary:
The application of ferrite ceramics is greatly limited due to the difficulty in ensuring the quality of the surface finish. In this paper, the grinding test of Li-Ti ferrite ceramics was carried out by using 80/100# resin bond diamond grinding wheel and W20 graphite white corundum grinding wheel. The grinding force, performance roughness and material removal rate were measured, and the unit width was analyzed. Grinding force, surface roughness and material removal rate per unit width with the variation of grinding parameters, the surface micro-morphology of the ferrite workpiece after grinding was observed and analyzed. The results show that the above-mentioned grinding wheel can achieve high-efficiency precision grinding of ferrite ceramics.
Topic 23: Analysis and Solution of Flatness Problems in the Production of Sintered Diamond-like Circular Saw Blades. Speaker: Yuan Yifei Speech summary:
Starting from the specifications, type, cutter formula, sintering equipment and process system of sintered diamond-like circular saw blades, the causes of the one-time flatness and difficult leveling problems of the products were analyzed. Through the type test, formula component test, sintering process test, the main factors affecting the flatness of the saw blade were qualitatively explained. The results show that the use of intermediate thickening or laser slitting matrix, reducing the content of Fe elemental powder in the cutter head formula, using tube furnace sintering equipment, etc., can reduce the blade flatness tolerance from 25% to 5 Below %; cold hammering methods such as hammering and rolling, and high and low temperature annealing thermal leveling methods can solve the production problem that the saw blade is difficult to level.
Topic 24: "A Study on the Performance of a New Type of Resin for Diamond Wheels". Speaker: Ye Xiaochuan Speech Abstract:
A new resin YF for diamond grinding wheels was introduced, and the grinding ratio of the diamond grinding wheel made thereof was tested. The results show that the diamond grinding wheel prepared with the new resin under water-cooling and dry-grinding conditions has excellent grinding performance. The surface morphology of several resin grinding wheels was observed by a stereo microscope, and the reason for the difference was found out: the holding force of the resin on the abrasive directly affected the wear resistance of the grinding wheel.
Lecture 25: "Study on the Uniform Design of Pre-alloyed Powder and Formulation for Reinforced Concrete Diamond Thin Wall Bits". Speaker: Wang Liwei Speech summary:
In this paper, a pre-alloyed powder was selected as one of the carcass components of reinforced concrete diamond thin-walled bricks. The carcass was optimized by uniform formulation design, and the sintering performance and drilling performance of the formulation were studied. A large number of internal and external tests have shown that the pre-alloyed powder can reduce the sintering temperature of the carcass by 30 °C, and can greatly improve the performance of the drill bit, which is 30% faster than similar foreign products. The uniform design of the formula has the advantages of fast and efficient, greatly The development time is shortened, the development cost is reduced, and the utility model has good practical value.
The summary of the speeches of various experts and scholars is now published as follows. I wish that China's super-hard materials industry will catch up with the world's advanced level and realize the great goal of super-hard materials. The technical forum in the first half of the afternoon of the 27th was presided over by Professor Wang Qinsheng, deputy director of the Expert Committee of Superhard Materials.
Topic 1: "A Brief Analysis of the Economic Operation Situation of Superhard Materials Industry in 2008". Speaker: Li Zhihong Abstract of the paper:
This paper analyzes the economic operation situation of China's superhard materials industry affected by the economic crisis. The growth rate of major economic indicators fell sharply, but the product structure improved significantly and the overall economy was still operating at a high level. Enterprises with high product quality, diversified market and domestic sales are less affected, and the growth rate of major economic indicators is still above 15%. The main products have been recognized by more and more international merchants, and the number and geographical scope of exports have expanded rapidly. Although the technology and product levels have been greatly improved, they have not been well reflected in the international market, and products from developed countries still dominate the high-end market. Improving the ability of independent innovation and vigorously adjusting the industry and product structure are still the direction that the industry's ambitions need to work hard.
Topic 2: "Pre-alloyed powder technology and research and development of Fe-based prealloyed powder". Speaker: Fang Xiaohu Abstract:
Pre-alloyed powder is a very important advanced technology in the current diamond tool manufacturing. This paper focuses on the performance and application characteristics of the latest pre-alloyed powders at home and abroad, and introduces new developments in the preparation and application of iron-based and alloy powders.
Topic 3: "Diamond Metal (Diamond Gold) Composites: Thermal Transmissive Interface for Computer Chips." Speaker: Yuan Zhizhong Abstract:
Industrial diamond abrasive particles can be infiltrated with copper or aluminum to form diamond metal (drilled gold) heat sinks. This composite material not only has a much higher thermal conductivity than the existing copper heat sink, but its thermal expansion rate can be adjusted to be synchronized with the semiconductor chip. In this way, the gold heat sink can be directly soldered to the chip to prevent the heat flow from being blocked by the heat sink. This article not only describes the design concept of the diamond heat sink, but also provides a lot of measured results, and recommends a low-cost manufacturing method as a reference to avoid the temperature loss of the computer CPU chip in the future.
Topic 4: "The world market status of gem-quality synthetic diamonds". Speaker: Yuan Zhizhong Abstract:
This paper introduces the current market situation of gem-quality synthetic diamonds, introduces HPHT synthetic diamonds and their identification methods, and details the methods of chemical vapor deposition (CVD) synthetic diamonds and the color, clarity and identification of them. The advantages of CVD synthesis and market application prospects. The technical forum for the second half of the afternoon on the 27th was hosted by Sun Yichao.
Topic 5: Research Progress in Boron-Based Superhard Materials. Speaker: 寇 自力 Abstract:
The design and synthesis of superhard materials is one of the hot topics in the field of materials science research. In recent years, due to the development of superhard material design theory, people have been experimentally and theoretically looking for materials with hardness close to or even exceeding diamond. This paper reviews the research status of boron-based materials such as BN, BxN, BxC, BxO, and BxCyNz in recent years, and introduces the latest research progress of strong incompressible material MxBy (M-transition metal) as a possible superhard material.
Topic 6: "Completion and Improvement of PCD/PCBN Performance for Cutting". Speaker: Jiang Rongchao Abstract of the paper:
This paper briefly introduces the development of PCD/PCBN, describes its grade and performance, and explores ways to improve and improve its quality and performance.
Topic 7: "Superhard Composites of SPS Sintered Diamond and Sialon Ceramics". Speaker: Wang Mingzhi Speech Summary:
In this paper, Sialon ceramics is used as a binder to sinter diamond ceramic composites using SPS technology. Through the formulation adjustment and optimization, the obtained sintered body has a dense and well-bonded structure under the condition of 1200 ° C + 50 MPa + 5 min heat preservation, and the diamond has no obvious graphitization.
Topic 8: "Structural Measurement of Composite Diamond Layers". Speaker: Hao Zhaoyin Speech Summary:
Due to the reaction of the diamond particles with the W and Co metals under high temperature and high pressure, the diamond layer of the composite sheet has a complicated structure. Electron microscopy and X-ray diffraction measurements show that in the diamond layer, in addition to the main diamond structure, there are WC, Co3, W3C, WC1-x structures, etc., and the morphology of the interconnected diamond particles is observed. It is important to understand the wear resistance of the composite sheet. Topic 9: Raman Spectra of Different Types of Cubic Boron Nitride Crystals. Speaker: Lu Zhanling's speech summary: The different types of cubic boron nitride (cBN) crystals were synthesized by Raman spectroscopy. The results show that the Raman spectra are significantly different and can be divided into several types: (1) typical cBN In the Raman spectrum, there are only two Raman peaks corresponding to cBN To and Lo modes, which are located at 1055 cm-1 and 1305 cm-1, respectively; (2) in addition to the characteristic peaks of cBN, at 925 cm-1, 955 cm-1 and 1245 cm- An extra peak appears around 1; (3) there is a peak of cBN To mode, but the peak corresponding to the Lo mode disappears, and an asymmetrical broad peak appears around 1286 cm-1. In addition, a plurality of additional peaks appeared at 760 cm-1, 920 cm-1, and 1015 cm-1. (4) A broad peak with a peak shape asymmetry appeared around 1286 cm-1, and the peak corresponding to the To mode has a large displacement. The Raman spectrum has a strong background from the low wave number end to the high wave number end. The reasons for these Raman peaks were analyzed and discussed.
Topic 10: "Study on the application of nano-diamonds to the polishing of sapphire substrates." Speaker: Liu Xueyu Speech Summary:
Sapphire is an important substrate for the epitaxial growth of gallium nitride. The C(001) oriented sapphire substrate was polished with nano-diamonds with Dmax≤100nm and D50 of 53.9nm, and compared with the polishing effect of SiO2. The results show that the polishing mechanism is different. The nano-diamond can quickly eliminate scratches in the polishing process, and obtain a smooth surface of 0.157 nm (AFM: 20 μm × 20 μm), but cannot effectively eliminate scratches in the polishing process. The polishing efficiencies of nanodiamond and SiO2 were 142 nm/min and 70.49 nm/min, respectively.
Lecture 11: "Effect of Cubic Boron Nitride Content on Properties of Polycrystalline Boron Nitride Composite Sheets". Speaker: Xie Hui Speech Abstract:
In this paper, the effect of cubic boron nitride (cBN) content on the sintering condition and properties of polycrystalline cubic boron nitride (PCBN) composite sheets was investigated. The phase analysis, microstructure observation, hardness test and conductivity test of PCBN composite sheets with different cBN contents were carried out. The results show that the phase of PCBN composites with different cBN content is different. With the increase of cBN content, the direct contact area between cBN particles and particles increases, the hardness of PCBN composite sheet increases, and the conductivity decreases. At the same time, the mechanism of the influence of cBN content on the performance of PCBN composite sheets was analyzed. Speech summary:
The few examples provided in this paper are sufficient to demonstrate the position and role of CVD diamond films in modern technology and industry. This is only the clue of the industrial application of CVD diamond film. More mystery needs to be explored, discovered and mastered. At the same time, it is pointed out that although there are still many technical problems that are not ideally solved, the application range of CVD diamond films is expanding day by day.
Topic 13: "Research on the Manufacturing Process of Diamond Ring Band Saw Blade for Silicon Crystal Cutting". Speaker: Zhan Zhibin Speech Summary:
In this paper, the technology, process, testing and environmental protection aspects of the manufacture of diamond ring band saw blades for single crystal silicon rod/polycrystalline silicon ingot cutting are introduced. The electrode band saw blade is made by electrodeposition method, and the steel material with good toughness and high strength is selected as the base material. Combined with high-quality diamond, the geometrical dimensions, yaw and runout of the base are strictly controlled, the surface of the diamond is treated, and the particle size is reformed. In the middle, the exclusive design of the rotating device is adopted, and the most advanced hourly parameter (Ah) measurement and control is introduced, and the band saw blade is manufactured with stable performance, long service life and high precision. In the subsequent treatment, the design adopted a zero-emission process and treated with wastewater generated by the membrane separation technology team. For low-concentration exhaust gas, the full sealing air exhaust channel is combined with the SDG composite adsorbent, and the purification efficiency can reach 98%, ensuring the national environmental protection requirements.
Topic 14: Characterization of the Microstructure of Nano-Diamond/Nickel Composite Brush Plating. Speaker: Zhao Mengyue Speech Summary:
A common fast nickel coating and a diamond/nickel composite brush coating were prepared on the basis of 45# steel, which was compared by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and metallographic microscope. The microstructure of the two coatings was investigated. The results of SEM analysis showed that the surface of the nano-composite brush coating was in the shape of a typical “cauliflower headâ€, and the dispersed nano-diamonds were wrapped by nickel. Compared with ordinary fast nickel, the mass fraction of the characteristic element C of the nano-particles in the diamond/nickel composite brush coating is 7.37%. The XRD analysis shows that the coating gradually changes to the amorphous state with the increase of the amount of nano-diamond added. The particle size gradually decreases.
Topic 15: Research on the grinding performance of nano-SiO2 modified diamond flexible grinding wheel. Speaker: Liu Zhihuan Speech Abstract:
In this paper, the effects of ultrasonic dispersion time and nano-addition on the mechanical properties of resin adhesives for flexible grinding wheels were studied. It was determined that the nano-SiO2 content was increased by 4% and 7% when it was 3%. After adding W40 diamond to the compound ratio of 2:1, the tensile strength of the adhesive modified by 3% nano-SiO2 was increased by 40%, the tensile shear strength was increased by 36%, and the diamond prepared by resin adhesive modified by 3% nano-SiO2 was prepared. The grinding performance of the flexible grinding wheel is greatly improved compared with the unmodified one, and the correspondingness of the mechanical properties of the adhesive and the grinding performance of the diamond flexible grinding wheel is also proved.
Topic 16: "Impact of Pre-Alloyed Powder Oxygen Content on the Microstructure and Properties of Diamond Tools". Speaker: Dong Shushan Speech Summary:
The oxygen content has an important influence on the properties and applications of the atomized prealloyed powder. Reducing the oxygen content is beneficial to activating the interface of the powder particles, lowering the sintering temperature, increasing the degree of densification of the sintered carcass, and improving the mechanical holding force of the carcass to the diamond, thereby improving the comprehensive performance of the diamond tool. In this paper, the influence of oxygen content on the sharpness and service life of diamond saw blade is studied. The suitable oxygen content range is determined to be 2500~4800ppm.
Topic 17: "The Effect of Pre-Alloy Composition and Sintering Process on the Sharpness of Saw Blades". Speaker: Dong Shushan Speech Summary:
In this paper, the effects of alloying elements Fe, Cu, Ni and Sn in iron-based (Fe-Cu) water atomized prealloyed powders and their effects on matrix microstructure, diamond holding power and saw blade sharpness are discussed. The computer optimization design method adjusts the formula combination, comprehensively analyzes the influence of alloy composition and sintering process on the sharpness of stone cutting saw blade, and discusses the technical way to improve the comprehensive performance of saw blade.
Lecture 18: "Research on Improving the Performance of Diamond Wire Saws for Reinforced Concrete Cutting". Speaker: Meng Yunkai Speech summary:
By analyzing the common problems in the process of sawing reinforced concrete by diamond wire saw, some technical problems to be solved in the development of diamond wire saw are pointed out. By adopting corresponding measures, the sawing efficiency is high and the quality is stable and reliable. A diamond wire saw for reinforced concrete cutting with low manufacturing costs. Topic 19: "Development and Application of New Diamond Composite Drill Bits". Speaker: Chen Jinliang Speech Summary:
This paper gives a detailed description of the structural characteristics and performance influencing factors of diamond composite sheets and composite drill bits, and analyzes the impact on the overall performance of diamond composite sheets. On this basis, combined with the use of the construction site, the characteristics of the diamond composite drill bit and the impregnated diamond drill bit were compared. It is proved that under certain formation conditions, the composite drill bit is a new type, longevity and high efficiency instead of the impregnated diamond drill bit. The economical drill bit can be widely used in underground coal mine geological exploration, gas drainage, discharge water, bolts and other drilling, as well as soft and hard rock drilling of various types of exploration drilling on the ground.
Topic 20: "Automated Production of Vacuum Brazed Diamond Tools". Speaker: Xie Tao Speech Abstract:
According to the process characteristics of vacuum brazing diamond tools, the relationship between diamond particle size, distribution density and amount of brazing filler metal in single-layer brazing process is studied. A vacuum brazing diamond automatic cloth distributing device and process are introduced. Automated production of brazed diamond tools is achieved by completing the uniform distribution of diamond and braze at one time.
Topic 21: Diamond Grinding Blocks for Ceramic Tile Polishing. Speaker: Liu Xuejing Speech Abstract:
This paper briefly introduces the structure and manufacturing process of diamond grinding blocks, and analyzes the characteristics of diamond grinding blocks from the aspects of optimizing labor conditions, energy saving, environmental protection and cost, and discusses the factors affecting the polishing effect of diamond grinding blocks and puts forward some improvements. Measures, looking forward to the development direction of diamond grinding blocks.
Topic 22: Experimental Research on Precision Grinding of Li-Ti Ferrite Ceramics. Speaker: Zhan Weiqiang Speech summary:
The application of ferrite ceramics is greatly limited due to the difficulty in ensuring the quality of the surface finish. In this paper, the grinding test of Li-Ti ferrite ceramics was carried out by using 80/100# resin bond diamond grinding wheel and W20 graphite white corundum grinding wheel. The grinding force, performance roughness and material removal rate were measured, and the unit width was analyzed. Grinding force, surface roughness and material removal rate per unit width with the variation of grinding parameters, the surface micro-morphology of the ferrite workpiece after grinding was observed and analyzed. The results show that the above-mentioned grinding wheel can achieve high-efficiency precision grinding of ferrite ceramics.
Topic 23: Analysis and Solution of Flatness Problems in the Production of Sintered Diamond-like Circular Saw Blades. Speaker: Yuan Yifei Speech summary:
Starting from the specifications, type, cutter formula, sintering equipment and process system of sintered diamond-like circular saw blades, the causes of the one-time flatness and difficult leveling problems of the products were analyzed. Through the type test, formula component test, sintering process test, the main factors affecting the flatness of the saw blade were qualitatively explained. The results show that the use of intermediate thickening or laser slitting matrix, reducing the content of Fe elemental powder in the cutter head formula, using tube furnace sintering equipment, etc., can reduce the blade flatness tolerance from 25% to 5 Below %; cold hammering methods such as hammering and rolling, and high and low temperature annealing thermal leveling methods can solve the production problem that the saw blade is difficult to level.
Topic 24: "A Study on the Performance of a New Type of Resin for Diamond Wheels". Speaker: Ye Xiaochuan Speech Abstract:
A new resin YF for diamond grinding wheels was introduced, and the grinding ratio of the diamond grinding wheel made thereof was tested. The results show that the diamond grinding wheel prepared with the new resin under water-cooling and dry-grinding conditions has excellent grinding performance. The surface morphology of several resin grinding wheels was observed by a stereo microscope, and the reason for the difference was found out: the holding force of the resin on the abrasive directly affected the wear resistance of the grinding wheel.
Lecture 25: "Study on the Uniform Design of Pre-alloyed Powder and Formulation for Reinforced Concrete Diamond Thin Wall Bits". Speaker: Wang Liwei Speech summary:
In this paper, a pre-alloyed powder was selected as one of the carcass components of reinforced concrete diamond thin-walled bricks. The carcass was optimized by uniform formulation design, and the sintering performance and drilling performance of the formulation were studied. A large number of internal and external tests have shown that the pre-alloyed powder can reduce the sintering temperature of the carcass by 30 °C, and can greatly improve the performance of the drill bit, which is 30% faster than similar foreign products. The uniform design of the formula has the advantages of fast and efficient, greatly The development time is shortened, the development cost is reduced, and the utility model has good practical value.
Five Bars Aluminum Checkered Plate sheet
5-Bar Tread Plate has very good corrosion resistance to seawater and marine and industrial atmospheres. It also has very good weldability and cold formability, always used for anti-slip floor etc.Chequered plates with distinct design and highly slip resistance can be easily configured into a variety of designs and patterns as per the client`s requirement. Aluminum plates can be supplied in different forms of finished products including diamond plates, aluminum checkered plates, tread plates and stair tread.Aluminum chequered plate is a product where quality and functionality meets beauty. It is used in air-conditioning, cable, exchanger, cigarettes, food, medicine, decoration, packaging, electrical, electric products and etc.
Five Bars Checkered Plate,Five Bars Aluminum Checkered Plate,Thickness Five Bar Checkered Plate
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