Process for production of cubic boron nitride

Details Process for production of cubic boron nitride Process for production of cubic boron nitride

1975-01-23

1977-04-05

Peters, G. O.

Chemistry of inorganic compounds

Boron or compound thereof

Binary compound

C01B 3514

Patent

active

040162443

ABSTRACT:
In synthesizing cubic boron nitride from hexagonal boron nitride under high temperature and high pressure conditions, if water is incorporated into the raw material in an amount of at least 3% by weight, cubic boron nitride of a higher purity in the form of smaller crystallites than in conventional products can be obtained under lower temperature and lower pressure conditions than in conventional methods. When graphitic hexagonal boron nitride is used as the raw material, the temperature and pressure necessary for synthesis can be reduced to about 600.degree. C. and 50 Kbar, respectively.

REFERENCES:
patent: 3212851 (1965-10-01), Bundy et al.
patent: 3661521 (1972-05-01), Birle
patent: 3768972 (1973-10-01), Taylor et al.
patent: 3918219 (1975-11-01), Wentorf

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