Mullite is a high quality refractory material, and this mineral is relatively rare. Mullite is an aluminosilicate, forming mineral at a high temperature, and artificial heating of aluminosilicates results in the formation of mullite. Natural mullite crystals are elongated and needle-like in radial clusters. Mullite ore is used in the production of high temperature refractory materials. It is widely used as a thermal barrier coating in carbon/carbon composites. Mullite(Al2O3-SiO2) element is a binary solid solution, stable at atmospheric pressure. Natural mullite with the chemical formula Al2O3-SiO2 is rare and is usually synthesized by sintering or electrofusion.
Mullite has excellent properties such as good thermal shock resistance, low creep at high temperature, low loss of high temperature properties, and stable chemical properties.White or light yellow particles or powder
Thermal expansion coefficient: 3.0×10-6/℃
Hardness: 6-6.5
Specific gravity: 2.75-3.0 g/cm3
Melting point: 1850℃
Linear expansion coefficient: 6.7 ×10-6/℃
1、Mullite refractory material
Mullite, is widely used in metallurgy, glass, ceramics and other fields. It has excellent corrosion resistance and thermal shock resistance.
2、Mullite coating
Many ceramics and metal materials will be damaged in high-temperature, reduction, oxidation and other environments for a long time.Such problems can be solved by coating the surface of the material with a layer of compound coating material that can remain stable in the use environment. Mullite's chemical stability, good corrosion resistance, and excellent performance make it widely used in compound coatings and other applications.
3、Mullite composite materials
Mullite does not have dislocation slip system, when the applied load exceeds a certain limit, more internal micro-cracks will be generated to consume energy, making mullite ceramics catastrophic damage. Mullite composites include mullite matrix, mullite fiber, etc. Mullite composites can reduce the inherent brittleness of mullite material system and improve its strength and toughness.
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