Mullite is an excellent refractory material. In addition, mullite is also a high-temperature structural material widely used in other industries.
(1) Mullite refractory material
Mullite, as an excellent refractory material, has high melting point, high high-temperature strength, low number of thermal expansion tickets, 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 glass chambers at the top; In the field of ceramics, mullite can be used for high-temperature structural ceramics; In the gas industry, 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, pads made from slag are used for kiln lining. This ZrO2/AL2O3/mullite slag contains 3-6wt% ZrO2 and<20wt% SiO2, and has excellent corrosion resistance and thermal shock resistance.
(2) 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 chemical coatings due to its excellent properties.
(3) 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, and when the external load exceeds a certain limit, more microcracks will be generated internally, consuming energy. How to toughen mullite materials has become a hot research topic in recent years, as it causes catastrophic damage to mullite ceramics. Domestic and foreign researchers have conducted extensive research on mullite composite materials. And certain achievements have been made 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 and improve their strength and toughness. After years of effort, the thermodynamic behavior of mullite based composite materials has been improved through particle reinforcement (SiC, ZrO2) or flakes, and some progress has been made in mullite toughening.
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