What is the difference between mullite fiber and alumina fiber?

Difference between mullite fiber and alumina fiber

1. Chemical composition

Mullite fiber: Mullite is a silicate mineral, its chemical composition mainly includes silicon, oxygen, aluminum, magnesium, iron and other elements. Mullite fiber is extracted from mullite ore, so the main component is aluminum silicate.

Alumina fiber: The main component of alumina fiber is alumina, which is a compound composed of oxygen and aluminum elements. Alumina has good heat resistance and chemical stability.

2. Crystalline structure

Mullite fibers: Mullite has a layered structure, consisting of alternating layers of silica-oxygen tetrahedra and oxy-aluminum hexahedra. This layered structure gives mullite fibers special properties in terms of water absorption and thermal expansion.

Alumina fibers: Alumina has a hexagonal crystal structure with high thermal stability and mechanical strength. This crystal structure gives alumina fibers excellent high temperature properties.

3. Physical properties

Mullite fibers: Mullite fibers usually show a soft, curved form and are sensitive to thermal expansion and chemical attack.

Alumina fibers: Alumina fibers have high tensile strength and hardness, while remaining stable at high temperatures. It also exhibits better corrosion resistance.

4. Areas of application

Mullite fibers: Due to their softness and low thermal stability, mullite fibers are often used in insulation materials, rubber fillers, etc., where relatively low high temperatures are required.

Alumina fibers: Alumina fibers are widely used in high-temperature insulation, refractory materials, aerospace and other applications where high temperatures and corrosion resistance are required due to their excellent high-temperature properties.

Overall, although both mullite and alumina fibers are important fiber materials, they differ significantly in their chemical composition, crystalline structure, physical properties, and application areas. An in-depth understanding of the properties of both types of fibers can help to make an informed choice in specific application scenarios to meet specific requirements and needs.

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