Improved porous mullite bodies and methods of forming them

Details Improved porous mullite bodies and methods of forming them Improved porous mullite bodies and methods of forming them

C - Chemistry, Metallurgy

04

B

C04B 35/185 (2006.01) B01D 39/20 (2006.01) C04B 35/622 (2006.01) C04B 38/00 (2006.01)

Patent

CA 2522916

A porous mullite composition is made by forming a mixture of one or more precursor compounds having the elements present in mullite (e.g., clay, alumina, silica) and a property enhancing compound. The property enhancing compound is a compound having an element selected from the group consisting of Mg, Ca, Fe, Na, K, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, B, Y, Sc, La and combination thereof. The mixture is shaped and to form a porous green shape which is heated under an atmosphere having a fluorine containing gas to a temperature sufficient to form a mullite composition comprised substantially of acicular mullite grains that are essentially chemically bound.

Pour préparer une composition de mullite poreuse, on forme un mélange d'au moins un composé précurseur dont les éléments sont présents dans la mullite (par exemple, l'argile, l'alumine, la silice) et d'un composé renforçant les propriétés. Le composé renforçant les propriétés est un composé comprenant un élément sélectionné dans le groupe formé par Mg, Ca, Fe, Na, K, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, B, Y, Sc, La et une combinaison de ces derniers. On façonne le mélange pour lui donner la forme d'un produit vert poreux qu'on chauffe dans une atmosphère à base de gaz contenant du fluor, à une température suffisante pour former une composition de mullite constituée essentiellement de grains de mullite aciculaires qui sont globalement chimiquement liés.

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