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 38/00 (2006.01) C04B 35/185 (2006.01) C04B 35/636 (2006.01) C04B 35/64 (2006.01)

Patent

CA 2480167

A method of forming a porous mullite composition of acicular mullite grains having improved properties is described, where the mullite is formed at some time in the presence of a fluroine containing gas. For example, it has been discovered that improved properties may result from heating the mullite to a high temperature in an atmosphere selected from the group consisting of water vapor, oxygen, an inert gas or mixtures thereof or forming the mullite composition from precursors having an AL/Si ratio of at most 2.95.

L'invention concerne un procédé de formation d'une composition poreuse de mullite à base de grains de mullite aciculaires ayant des propriétés améliorées. La mullite est obtenue à un certain moment en présence d'un gaz contenant du fluor. On a découvert, par exemple, que les propriétés peuvent être améliorées par le chauffage de la mullite à une température élevée dans une atmosphère sélectionnée dans le groupe constitué de vapeur d'eau, d'oxygène, d'un gaz inerte ou de leurs mélanges ou par la formation de la composition de mullite à partir de précurseurs ayant un rapport LA/Si de 2,95 au maximum.

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