Method of preparing polycrystalline cubic boron nitride

Details Method of preparing polycrystalline cubic boron nitride Method of preparing polycrystalline cubic boron nitride

1978-06-28

1979-04-10

Peters, G. O.

Chemistry of inorganic compounds

Boron or compound thereof

Binary compound

51307, 51309, C01B 2106

Patent

active

041488636

ABSTRACT:
According to the invention, a method of preparing polycrystalline cubic bn nitride resides in that hexagonal boron nitride is subjected to the action of pressure of 40-90 kbar and temperature of 1200.degree.-2400.degree. C. in the presence of a catalyst, namely, a zinc compound.
The proposed method makes it possible to increase considerably wear resistance of polycrystalline cubic boron nitride used in tools for working hardened steels and alloys.

REFERENCES:
patent: 3189412 (1965-06-01), Wood et al.
patent: 3692474 (1972-09-01), Arber et al.
patent: 3852078 (1974-12-01), Wakatsuki et al.
patent: 3890430 (1975-06-01), Bakul et al.

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