Process for Preparing Mullite Powder and Fabrication of Structural Bodies Therefrom.
DEPARTMENT OF THE AIR FORCE WASHINGTON D C
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A process is provided for preparing high purity, submicron, mullite powder 3Al2O3.2SiO2 by hydrolytically decomposing aluminum tris isopropoxide and silicon tetrakis isopropoxide in the presence of ammonium hydroxide or a very dilute mineral acid. The powder as prepared as well as that subjected to calcination has an orthorhombic crystal structure. Structural bodies of near theoretical density can be fabricated by vacuum hot pressing the powder. Because of its large surface area, the mullite powder is an excellent catalyst and catalyst carrier, especially for hydrocarbon cracking catalysts. It also provides refractories that are thermal shock resistant.
- Physical Chemistry
- Ceramics, Refractories and Glass