Accession Number : ADD002068

Title :   Process for Preparing Mullite Powder and Fabrication of Structural Bodies Therefrom.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Mazdiyasni,Khodabakhsh S ; Brown,Leanne M

Report Date : 25 Nov 1975

Pagination or Media Count : 5

Abstract : 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.

Descriptors :   *Aluminum compounds, *Patents, Silicates, Decomposition, Catalysts, Catalytic cracking, Refractory materials, Particle size, Organometallic compounds

Subject Categories : Physical Chemistry
      Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE