Polycrystalline abrasive materials and method of manufacture

Details Polycrystalline abrasive materials and method of manufacture Polycrystalline abrasive materials and method of manufacture

C - Chemistry, Metallurgy

09

K

C09K 3/14 (2006.01)

Patent

CA 2564741

A method of manufacturing polycrystalline abrasive elements consisting of micron, sub-micron or nano-sized ultrahard abrasives dispersed in micron, sub- micron or nano-sized matrix materials. A plurality of ultrahard abrasive particles having vitreophilic surfaces are coated with a matrix precursor material and then treated to render them suitable for sintering. The matrix precursor material can be converted to an oxide, nitride, carbide, oxynitride, oxycarbide, or carbonitride, or an elemental form thereof. The coated ultrahard abrasive particles are consolidated and sintered at a pressure and temperature at which they are crystallographically or thermodynamically stable.

L'invention concerne un procédé permettant de produire des éléments polycristallins constitués d'abrasifs ultradurs de taille micronique, sub-micronique ou nanométrique dispersés dans des matériaux matriciels de taille micronique, sub-micronique ou nanométrique. Une pluralité de particules abrasives ultradures comprenant des surfaces vitréophiles sont revêtues d'un matériau précurseur matriciel, puis traitées afin de les rendre aptes au frittage. Ledit matériau précurseur matriciel peut être converti en oxyde, nitrure, carbure, oxynitrure, oxycarbure ou carbonitrure ou en forme élémentaire de ceux-ci. Les particules abrasives ultradures revêtues sont consolidées et frittées à une pression et à une température à laquelle elles sont cristallographiquement ou thermodynamiquement stables.

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