Process for making cubic boron nitride from coated hexagonal bor

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

1989-06-14

1991-05-14

Dixon, Jr., William R.

Abrasive tool making process, material, or composition

Miscellaneous

51295, 51309, B24D 300

Patent

active

050152653

ABSTRACT:
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, metal carbides, metal nitrides and metal borides. A preferred coating agent is titanium carbide.

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