Diamond particle having a composite coating of titanium and a metal layer

Claim 1

A DIAMON PARTICLE OF THE MD OR SD TYPE HAVING A COMPOSITE COATING COMPRISING A THIN CONTINUOUS LAYER OF TITANIUM ADJACENT THE DIAMOND SURFACE, THE TITANIUM BEING PRESENT IN AN EFFECTIVE AMOUNT LESS THAN 3% BY WEIGHT OF THE UNCOATED PARTICLE, SAID AMOUNT BEING EFFECTIVE TO PROVIDE A CONTINUOUS LAYER AROUND THE DIAMOND PARTICLE, AND A METAL LAYER ON THE TITANIUM LAYER, THE METAL OF THE METAL LAYER BEING SELECTED FROM THE GOUP CONSISTING OF IRON, NICKEL, COBALT, COPPER AND ALLOYS CONTAINING ONE OR MORE OF THESE METALS AND BEING CAPABLE OF FORMING AN ALLOY WITH TITANIUM UNDER THE INFLUENCE OF HEAT AND BEING PRESENT IN AN AMOUNT OF FROM 10 TO 100% BY WEIGHT OF THE UNCOATED PARTICLE, AND THE INTERFACE BETWEEN THE DIAMOND AND THE TITANIUM BEING ESSENTIALLY FREE OF CHEMICAL BOND FORMATION.

Claim 6

A method of manufacturing a metal bonded abrasive device including the steps of: a. forming an effective mixture of a solid metal matrix material and diamond particles of the MD or SD type having a composite coating comprising a thin continuous layer of titanium adjacent the diamond surface, the titanium being present in an effective amount less than 3% by weight of the uncoated particle, said amount being effective to provide a continuous layer around the diamond particle, and a metal layer on the titanium layer, the metal of the metal layer being selected from the group consisting of iron, nickel, cobalt, copper and alloys containing one or more of these metals and being capable of forming an alloy with titanium under the influence of heat and being present in an amount of from 10 to 100% by weight of the uncoated particle, and the interface between the diamond and the titanium being essentially free of chemical bond formation; b. heating the mixture to a temperature exceeding 500*C; c. maintaining the mixture at a temperature exceeding 500*C for a period of from 10 to 30 minutes; and d. allowing the mixture to return to ambient conditions.

Claim 7

A method of manufacturing a metal bonded abrasive device including the steps of: a. forming an effective mixture of a solid metal matrix material and diamond particles of the MD or SD type having a composite coating comprising a thin continuous layer of titanium adjacent the diamond surface, the titanium being present in an effective amount less than 3% by weight of the uncoated particle, said amount being effective to provide a continuous layer around the diamond particle, and a metal layer on the titanium layer, the metal of the metal layer being selected from the group consisting of iron, nickel, cobalt, copper and alloys containing one or more of these metals and being capable of forming an alloy with titanium under the influence of heat and being present in an amount of from 10 to 100% by weight of the uncoated particle, and the interface between the diamond and the titanium being essentially free of chemical bond formation; b. heating the mixture to a temperature exceeding 500*C; c. maintaining the mixture at a temperature exceeding 500*C for a period of from 10 to 30 minutes; and d. allowing the mixture to return to ambient conditions.