A method of making a composite abrasive compact

Details A method of making a composite abrasive compact A method of making a composite abrasive compact

B - Operations, Transporting

22

F

B22F 7/06 (2006.01) B24D 3/00 (2006.01)

Patent

CA 2426532

There is provided a method of making a composite abrasive compact which comprises an abrasive compact (30) bonded to a substrate (32). The abrasive compact will generally be a diamond compact and the substrate will generally be a cemented carbide substrate. The composite abrasive compact is made under known conditions of elevated temperature and pressure suitable for producing abrasive compacts. The method is characterised by the mass of abrasive particles from which the abrasive compact is made. This mass has three regions which are: (i) an inner region (36), adjacent the surface of the substrate (32) on which the mass is provided, containing particles having at least four different average particle sizes; (ii) an outer region (40) containing particles having at least three different average particle sizes; and (iii) an intermediate region (38) between the first and second regions.

Cette invention a trait à un procédé de fabrication d'un article composite abrasif compact consistant en un article abrasif compact fixé à un substrat. Cet article abrasif compact est constitué, généralement, d'une structure compacte de diamant et le substrat est, d'ordinaire, un substrat au carbure métallique. On fabrique cet article sous des températures élevées et sous une pression appropriée, conditions de fabrication connues de l'homme de l'art. Ce procédé se caractérise par la spécificité de la masse de particules abrasives à partir desquelles l'article est produit. Cette masse est constituée de trois régions, en l'occurrence, (i), d'une région interne, adjacente à la surface du substrat sur lequel est disposée ladite masse, contenant des particules d'au moins quatre dimensions de particule moyennes différentes, (ii), d'une région externe contenant des particules d'au moins trois dimensions de particule moyennes différentes et, (iii), d'une région intermédiaire venant s'intercaler entre les deux premières.

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