Mullite is a high-performance refractory material. In addition, mullite is also a high-temperature structural material widely used in other industries.
Mullite refractory material
Mullite, as an excellent refractory material, has high melting point, high high-temperature strength, low coefficient of thermal expansion, and excellent thermal shock resistance, making it a refractory material in many industrial fields. Mullite, as an aggregate, is widely used in metallurgy, glass, ceramics and other fields. In the metallurgical industry, mullite can be used for hot blast furnace bricks or kiln furniture bricks; In the glass industry, mullite can be used in structures such as glass containers, water feeders, and the top of glass kilns; In the field of ceramics, mullite can be used for high-temperature structural ceramics in the gas industry, and mullite can be used in oil gasification equipment and all gasification workshops, coke ovens, and gas generators. Molaishi bricks can be used as the main component of the upper lining of furnaces, blast furnaces, and continuous casting furnaces. In Japan, cushion plates made from slag are used for kiln lining. This ZRO2/AL2O3/mullite slag ZrO2 contains 3-6 wt%, SiO2<20 wt%, and has excellent corrosion resistance and thermal shock resistance.
Mullite coating
Many ceramic and metal materials can be damaged by long-term exposure to high temperatures, reduction, oxidation, and other environments. This type of problem can be solved by coating the material surface with a compound coating material that can maintain stability in the usage environment. The chemical stability and corrosion resistance of mullite make it widely used in compound coatings due to its excellent properties.
Mullite composite material
Due to its excellent high-temperature mechanical properties, chemical stability, creep resistance, thermal shock resistance, and low coefficient of thermal expansion, mullite is widely used in the field of high-temperature thermal materials. However, mullite does not have a dislocation slip system. When the external load exceeds a certain limit, more microcracks will be generated internally, consuming energy and causing catastrophic damage to mullite ceramics. Therefore, how to toughen mullite materials has become a hot research topic in recent years. Domestic and foreign researchers have conducted extensive research on mullite composite materials and have achieved certain results in the field of mullite toughening. Mullite composite materials include mullite matrix, mullite fibers, etc. Mullite composite materials can reduce the inherent brittleness of mullite material systems. Improve its strength and toughness. After years of effort, the thermodynamic behavior of mullite based composite materials has been improved through particle strengthening (SiC, ZrO2) or flaking, and some progress has been made in mullite toughening.
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