Abstract: A mass of cubic boron nitride(CBN) crystals, aluminum or aluminum alloy and a silicon carbide ceramic substrate are disposed in a container which is placed within a pressure-transmitting powder medium. Pressure ranging from about 20,000 psi to about 200,000 psi is applied to the powder medium resulting in substantially isostatic pressure being applied to the container and its contents. To the resulting shaped substantially-isostatic system of powder-enveloped container, heat and pressure are applied simultaneously whereby the aluminum or aluminum alloy is liquefied and infiltrated through the interstices between the CBN crystals and diffused into the contacting face of the silicon carbide substrate sufficiently to produce, upon cooling, an adherently bonded integral composite.

Abstract: Abrasive particles are prepared by milling diamond particles, metal compound and milling balls to smear a coating of the compound on the diamond particles and firing the compound-coated diamond particles producing a rough granular adherent covering of metal and/or metal carbide surface coating chemically bonded to the diamond surface by metal carbide.

Abstract: Abrasive particles are prepared by milling cubic boron nitride particles, metal compound and milling balls to smear a coating of the compound on the cubic boron nitride particles and firing the compound-coated boron nitride particles producing a rough granular adherent covering of metal and/or metal boride and/or nitride surface coating chemically bonded to the cubic boron nitride surface by metal boride and/or nitride.

Abstract: Cubic boron nitride (CBN) crystals of graded particle size are chemically cleaned and disposed in a protective metal cup together with a mass of substrate source material and a concentration of metal for providing an alloy for infusing and wetting the walls of capillary-size voids. The CBN content is increased in density to greater than 70% by volume and placed within a semi-isostatic system of finely-divided powder. Pressure in the range of from about 20,000 to about 100,000 psi is applied semi-isostatically to the system and thereby to the metal cup and its contents. Heat and pressure are then simultaneously applied to the semi-isostatic system. Liquefied infusing and wetting alloy enters the interstices between the CBN crystals to bond them together. The entire system is cooled and the strong composite body of metal-bonded CBN directly bonded to a substrate is recovered therefrom.