Mullite bodies and methods of forming mullite bodies

Details Mullite bodies and methods of forming mullite bodies Mullite bodies and methods of forming mullite bodies

C - Chemistry, Metallurgy

04

B

C04B 35/185 (2006.01) B01D 53/94 (2006.01) B01J 29/00 (2006.01) C04B 35/622 (2006.01) C04B 38/00 (2006.01) F01N 3/035 (2006.01) F01N 3/28 (2006.01)

Patent

CA 2382312

A mullite composition is comprised substantially of mullite grains that are essentially chemically bound wherein the composition h as at least two adjoining regions that have substantially different microstructures. The composition may be produced by forming a mixture of one or more precursor compounds having the elements present in mullite; shaping the mixture into a porous green shape applying a nucleation control agent to a portion of the porous green shape and then heating the porous green shape under an atmosphere and to a temperature sufficient to form the mullite composition.

L'invention concerne une composition de mullite constituée sensiblement de grains de mullite liés de manière essentiellement chimique. Cette composition comporte au moins deux régions contiguës qui présentent des microstructures sensiblement différentes. Pour obtenir cette composition, on peut produire un mélange d'un ou de plusieurs composés précurseurs comportant les éléments présents dans la mullite; on confère à ce mélange une forme verte poreuse; on applique un agent de nucléation sur une partie de cette forme verte poreuse; puis on chauffe cette forme verte poreuse dans une atmosphère et à une température suffisantes pour obtenir la composition de mullite.

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