Process for making cubic boron nitride from coated hexagonal...

Details Process for making cubic boron nitride from coated hexagonal... Process for making cubic boron nitride from coated hexagonal...

Category

C - Chemistry, Metallurgy

Subcategory

01

Subsubcategory

B

CPC

57/15, 23/7, 117

IPC codes

C01B 35/14 (2006.01) B24D 3/04 (2006.01) C04B 35/5831 (2006.01) C09C 3/06 (2006.01) C09K 3/14 (2006.01)

Type

Patent

Patent number

CA 2014923

Description

Dkt. No. 60-SD-351 ABSTRACT OF THE DISCLOSURE Abrasive particles and articles made from cubic boron nitride derived from coated hexagonal boron nitride which is substantially free of oxides and volatile contaminants. Polycrystalline CBN is prepared from HBN by removing oxide from the surface of HBN particles to form HBN particles having a substantially oxide-free surface. The HBN particles having a substantially oxide-free surface are coated with an agent which is capable of preventing re-oxidation of the surface of the HBN particles to form coated HBN particles in a substantially oxide-free state. The coated HBN particles in a substantially oxide-free state are then converted to a polycrystalline CBN by direct conversion of HBN to CBN. Coating agents include metals, metals carbides, metal nitrides and metal borides. A preferred coating agent is titanium carbide.

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