Method for making a sic based ceramic porous body

Details Method for making a sic based ceramic porous body Method for making a sic based ceramic porous body

C - Chemistry, Metallurgy

04

B

C04B 35/573 (2006.01) C04B 38/00 (2006.01)

Patent

CA 2676652

The invention relates to a method for making a SiC-based porous refractory ceramic product by high-temperature baking and sintering from a fraction of fine SiC particles and a fraction of SiC particles of a larger size, said method being characterised in that, during a step preceding the high-temperature baking and sintering, the finest SiC particles are agglomerated while, during a second step, the granules thus obtained are added to the SiC powder including the particles with the largest size. The invention also relates to a porous SiC body re-crystallised essentially into a CC form, in particular a particle filter for automotive application, obtained by said method.

L'invention se rapporte à un procédé de fabrication d'un produit céramique réfractaire poreux à base de SiC, par cuisson et frittage à haute température, à partir d'une fraction de particules fines de SiC et d'une fraction de particules de plus grande taille de SiC, ledit procédé étant caractérisé en ce que, dans une étape préalable à la cuisson et au frittage à haute température, les plus fines particules de SiC sont agglomérées, puis dans une deuxième étape, les granules ainsi obtenus sont ajoutés à la poudre de SiC présentant des particules de plus grande taille. L' invention se rapporte également à un corps poreux en SiC recristallisé sous forme essentiellement CC, en particulier filtre à particules pour application automobile, obtenu par un tel procédé.

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