Saint-gobain Centre De Recherches Et D'etudes Europeen

Saint-gobain Ceramic Materials As

Jostein Mosby

Ana-Maria Popa

Yves Boussant-Roux

Abhaya Kumar Bakshi

Stephen D Hartline

Yves Marcel Leon Boussant-Roux

Vidar Johannessen

Sjur Vidar Velken

Arne Menne

Yves Marcel Léon Boussant-Roux

A process for obtaining granules for manufacturing a silicon carbide based sintered product, includes a) mixing a powder of silicon carbide SiC particles, whose average diameter dis at least about 2 micrometers with a powder of a boron compound particles, whose average diameter dis at least about 2 micrometers, the SiC particles content being more than 90% by weight of the powder mixture; b) co-milling the powder mixture until the overall average diameter dof the resulting particles is between 0.3 and 1 micrometers; c) chemically treating the powder mixture by base solution and acid wash; d) mixing the powder mixture of c) with 1 to 10% by weight, based upon the silicon carbide content, of a carbon containing resin having a water miscibility of more than 10:50, as measured according to the ISO8989 standard, and e) spray-drying the resulting mixture of d), to generate the granules.

Method for making a dense sic based ceramic product

The invention relates to a process for fabrication of a porous refractory ceramic product made from SiC, by heat treatment and sintering at high temperature, starting from a fraction of fine particles of SiC and from a fraction of larger-sized particles of SiC, said process being characterized in that, in a step preliminary to the heat treatment and to the sintering at high temperature, the finest particles of SiC are agglomerated then, in a second step, the granules thus obtained are added to the SiC powder with particles of larger size. The invention also relates to a porous body made from recrystallized SiC in an essentially &#x3b1; form, in particular a particulate filter for automobile application, obtained by such a process.

Method for making a SiC based ceramic porous body

Abrasive grain powder, in particular intended for machining silicon ingots, such that the granulometric fraction D-Dcomprises more than 15% and less than 80%, as percentages by volume, of grains having circularity of less than 0.85.

Abrasive grain powder

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Mosby, Norway

Jostein Mosby