Preparation and use of mullite whisker networks

Details Preparation and use of mullite whisker networks Preparation and use of mullite whisker networks

C - Chemistry, Metallurgy

04

B

C04B 35/18 (2006.01) B01D 39/20 (2006.01) C04B 30/02 (2006.01) C04B 35/80 (2006.01) C04B 38/00 (2006.01) C30B 9/00 (2006.01) F01N 3/022 (2006.01) F01N 3/28 (2006.01) F02B 3/06 (2006.01)

Patent

CA 2097292

2097292 9211219 PCTABS00014 A process for producing mullite whiskers includes heating a non-stoichiometric mixture containing aluminum and silicon to a temperature within a range of 500 ·C to 950 ·C in the presence of SiF4 gas to form fluorotopaz and then to a temperature within a range of 800 ·C to 1500 ·C to convert the fluorotopaz into mullite. A mullite whisker-forming composition that procudes an interlaced network of single crystal mullite whiskers with a controlled permeability comprises a mixture of an aluminum-containing material with a silicon-containing material and a fluxing agent which melts at temperatures below 1000 ·C. The ratio of aluminum atoms to silicon atoms in the resultant product is approximately non-stoichiometric. The network may, for example, be used to fabricate a regenerable exhaust gas filter element for diesel engines.

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