Ceramic materials in powder form and method for their...

C - Chemistry – Metallurgy – 04 – B

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C04B 35/622 (2006.01) C01B 21/06 (2006.01) C01B 21/082 (2006.01) C04B 35/597 (2006.01) C04B 41/50 (2006.01)

Patent

CA 2441576

The invention relates to a ceramic material in powder form comprising particles having an average particle size of 0.1 to 30 µm and each formed of an agglomerate of grains with each grain comprising a nanocrystal of a ceramic material of formula (I): Si3-xAlxOyNz, wherein 0 <= x <= 3, 0 <= y <= 6 and 0 <= z <= 4, with the proviso that when x is 0 or 3, y cannot be 0. The ceramic material in powder form according to the invention is suitable for use in the production of ceramic bodies by powder metallurgy, as well as in the formation of heat-resistant coatings by thermal deposition. The ceramic bodies and coatings obtained have improved resistance to thermal shocks.

L'invention concerne des matériaux céramiques en poudre, comprenant des particules possédant une taille moyenne comprise entre 0,1 et 30 µm et formées chacune d'un agglomérat de grains comportant chacun un nanocristal de matériau céramique de formule (I): Si¿3-x?Al¿x?O¿y?N¿z?, dans laquelle 0<=x<=3, 0<=y<=6 et 0<=z<=4, à condition que lorsque x vaut 0 ou 3, y ne puisse valoir 0. Le matériau céramique en poudre de l'invention convient à la production de corps en céramique par métallurgie des poudres, ainsi qu'à la formation par dépôt thermique de revêtements résistant à la chaleur. Les corps et les revêtements en céramique obtenus présentent une résistance accrue aux chocs thermiques.

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