Cubic boron nitride, catalyst for synthesizing cubic boron nitride, and process for producing cubic boron nitride

Abstract

Cubic boron nitride (CBN) is produced with a CBN synthesis catalyst which comprises a CBN synthesis catalyst ingredient and an organic substance with which the surface of the catalyst ingredient has been coated. The amount of the organic substance is preferably 0.01 to 50 parts by weight per 100 parts by weight of the CBN synthesis catalyst ingredient. The organic substance preferably is stearic acid and / or lauric acid. By the use of such CBN synthesis catalyst, CBN which has a sharp shape with a well developed (111) plane and which is reduced in catalyst ingredient inclusion therein can be produced at a high conversion (in high yield) through simple steps and operations with satisfactory productivity.

Description

Technical field

[0001] The present invention relates to cubic boron nitride (hereinafter referred to as CBN) used in grinding wheels, etc., and a CBN synthesis catalyst (also referred to as solvent) used in the production of CBN from hexagonal boron nitride (hereinafter referred to as HBN), and the use of The CBN manufacturing method of the CBN synthesis catalyst is described. Background technique

[0002] CBN has a hardness second only to diamond and has a chemical stability that exceeds that of diamond, and its demand for abrasive grains for grinding, polishing, and cutting materials is increasing. Various methods for the manufacture of cubic boron nitride have been proposed. Among them, the most widely known and widely used method in industry is to maintain HBN at about 4 to 6 GPa and about 1400 to 1600°C in the presence of a CBN synthesis catalyst. A method of converting hexagonal boron nitride into cubic boron nitride in the thermodynamically stable region of cubic boron nit...