Aluminum silicate material is widely used in the market for insulation materials, and its types are also very rich, such as aluminum silicate board, aluminum silicate needle acupuncture blanket and so on. Let's take a look at what the excellent properties of aluminum silicate materials are.
As one of the high temperature insulation materials, aluminum silicate has light weight, heat resistance up to 1050 degrees, good heat preservation effect, and is widely used in power plants, petroleum, chemical and other industries.
(1) High temperature resistance performance According to the different types of raw materials, aluminum silicate fibers can be classified into low temperature type (below 900 °C), standard type (below 1200 °C), and high temperature type (1400~1600 °C) according to the maximum use temperature. It is much higher than the maximum operating temperature (500~700 °C) of fibrous thermal insulation materials such as rock wool and glass wool.
(2) Thermal conductivity The small aluminum silicate fiber has a small thermal conductivity in a high temperature region and has an excellent heat insulating effect. At 1000 ° C, its thermal conductivity is only 15% of refractory clay bricks, about 38% of lightweight clay bricks, but its thermal conductivity is closely related to temperature, bulk density, slag ball content and fiber diameter.
The thermal conductivity of aluminum silicate fiber decreases with the increase of bulk density, but the decreasing extent is gradually reduced. Even when the bulk density exceeds a certain range, the thermal conductivity no longer decreases, and there is an increasing trend.
2 At different temperatures, there is a minimum thermal conductivity and a corresponding minimum bulk density.
3 The minimum thermal density corresponding to the minimum thermal conductivity increases with increasing temperature.
(3) The bulk density is generally between 90 and 220 kg/m3, which is equivalent to 1/5~1/3 of the lightweight refractory brick.
(4) Good thermal stability Since the aluminum silicate fiber has elasticity and is a long fiber, structural stress is not generated even if the temperature is drastically changed, and the product is a porous material in which fibers are interwoven, and the expansion of the monomer fiber Can be absorbed by the product itself. Therefore, with sufficient construction technology, sufficient strength and resistance to quenching and rapid heat can be obtained.
(5) Good chemical stability, except for strong alkali, hydrofluoric acid, and phosphoric acid, which are hardly eroded by other chemicals. Aluminosilicate fibers have excellent chemical stability in oxidizing and neutral atmospheres. The chemical stability of the reducing atmosphere, alkali metal oxides and sulfides is relatively poor, and crystallization is liable to occur, deteriorating the fiber properties. The chemical stability of aluminum silicate fiber depends mainly on its chemical composition and impurity content. The following table lists the chemical stability of three different compositions of aluminum silicate fiber. It can be seen from the table that the pure Al2O3 fiber has the best chemical stability, and when SiO2 fluctuates within the range of 50% to 60%, it has little effect on the chemical stability.
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