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What is Mullite Powder?
Mullite powder is a white crystalline powder. It is easy to absorb moisture but not deliquescent. Melting point 2050℃; boiling point 2980℃; relative density 3.965. It has high hardness, Mohs hardness 8.8. It is an electrical insulator, with a volume resistivity of (1.2×1013Q.cm) at 300℃.
It is almost insoluble in water and non-polar organic solvents such as ethanol and ether. It has low solubility in weak acids or weak bases. It is soluble in concentrated sulfuric acid and slowly dissolves in alkali solution to form hydroxide.
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Komposisi kimia
| Chemical formula | Mass percentage（%） |
|---|---|
| SiO₂ | 50.0 – 65.0 |
| Al₂O₃ | 30.0 – 40.0 |
| Fe₂O₃ | < 5.0 |
| CaO | < 2.0 |
| Na₂O | < 1.0 |
| MgO | < 2.0 |
Sifat fisik
| Sifat fisik | Numeric |
|---|---|
| density | 2.65 g/cm³ |
| Specific surface area | 10-20 m²/g |
| granularity | 100-200 μm |
| Melting point | 1850 ℃ |
| kekerasan | 6.5-7（Mohs hardness） |
| Konduktivitas termal | 0.2-0.3 W/(m·K) |
| Water absorption | <1% |
Mullite powder preparation method
Heat aluminum hydroxide to dehydrate it to produce aluminum oxide. Alternatively, use aluminum chloride vapor and oxygen or water vapor to react at above 1000℃ to obtain micro-particle aluminum oxide. It is also possible to use aluminum sulfate, aluminum nitrate and other salts to directly thermally decompose at 1200-1300℃ to obtain aluminum oxide.
There are mainly two types of aluminum oxide powder and hydrated aluminum oxide.
1. The preparation of aluminum oxide powder can be achieved by precipitation, thermal decomposition, calcination and other methods of aluminum oxide sol.
2. Hydrated aluminum oxide can be prepared by precipitation or hydrothermal method.
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Precautions for using mullite powder
- Alumina powder may irritate the respiratory tract and eyes. Protective equipment should be worn when using it to avoid inhalation of dust and contact with eyes.
- Alumina may undergo thermal decomposition under high temperature conditions and release harmful gases. Pay attention to ventilation conditions.
- When storing and using alumina, avoid contact with organic matter, combustible substances and strong acids to prevent fire or explosion.
Application of Mullite Powder in Precision Manufacturing
- Preparation of ceramics and glass: Alumina is an important raw material for ceramic and glass products, such as ceramic products, tiles, abrasif, glass fibers, dll..
- Abrasives and polishing agents: The high hardness of alumina makes it an excellent abrasive and polishing agent for metal processing, glass processing, and stone processing, dll..
- Catalyst: Alumina can be used as a catalyst carrier and plays an important catalytic role in chemical reactions.
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