In recent years, China's coal gasification technology has developed rapidly, and slag gasification has become the main development direction. This high-efficiency coal conversion process is accompanied by high temperature and high pressure, strong reducing atmosphere, and highly acidic coal cinder. Cr has the lowest solubility in coal slag. Therefore, increasingly higher levels of chromia refractory materials are being continuously researched and improved as lining materials for coal-water slurry pressurization gasifiers. There are still many problems in the development and application of high-chromium refractories. Among them, the outstanding performance of chromia materials with higher content is poor thermal shock resistance, so that the superior slag resistance performance of materials is difficult to be fully utilized. Limit your application. This article examines the effect of the addition on optimizing the structure of high chromium materials, improving the mechanical properties and thermal shock resistance of the material.
The microstructure of high-chromium materials can form a continuous solid solution, which can significantly promote the sintering of Cr materials, and can significantly increase the degree of close bonding between the matrix and the particles. In the presence of Al, the microstructure of the high-chromium material is characterized by the continuous structure of the sintered solid solution of Cr in the matrix. A solid solution is formed around the Cr particles and directly bonded to the matrix. This continuous particle is directly bonded to the matrix. The structure makes the strength of the material significantly improved, and the amount of Al added achieves better results. This is related to the toughening effect of microcracks produced by the phase transition of ZrO. However, when the addition amount reaches a certain level, the retention of the residual strength of the material decreases as the addition amount of ZrO increases. The relationship between the room temperature performance of high-chromium materials and the amount of ZrO added is seen in the increase of the amount of addition, the apparent porosity of the sample increases, the bulk density decreases, the room temperature compressive strength and the room temperature flexural strength when the ZrO addition is less than 2b, with ZrO The increase in volume shows a downward trend, and when it exceeds 2b, it starts to rise again.
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