Boron nitride complex and process for its preparation, and proce

Details Boron nitride complex and process for its preparation, and proce Boron nitride complex and process for its preparation, and proce

1983-09-14

1985-12-31

Williams, Howard S.

Compositions: ceramic

Ceramic compositions

Refractory

423290, C04B 3558, C01B 21064

Patent

active

045621632

ABSTRACT:
A boron nitride complex comprising hBN in which lithium or an alkaline earth metal is diffused and supported in the form of its boron nitride. The boron nitride complex is prepared by heating hBN powder or a sintered product thereof and lithium, an alkaline earth metal, a lithium nitride or boride, or an alkaline earth metal nitride or boride in a non-oxidizing atmosphere to diffuse in and deposit on hBN powder or sintered product thereof, the lithium or alkaline earth metal in the form of its boron nitride. Also disclosed is a process for preparing a light-transmitting dense body of cubic system boron nitride, which comprises diffusing in and depositing on a sintered product of hexagonal system boron nitride, from 0.15 to 3.0 molar % of Me.sub.3 B.sub.2 N.sub.4 where Me is an alkaline earth metal, and sintering the Me.sub.3 B.sub.2 N.sub.4 -containing product thereby obtained, at a temperature of at least 1350.degree. C. under a thermodynamically stable pressure for cubic system boron nitride.

REFERENCES:
patent: 3701826 (1972-10-01), De Vries et al.
patent: 4287164 (1981-09-01), Endo et al.
patent: 4361543 (1982-11-01), Zhdanovich et al.
patent: 4409193 (1983-10-01), Sato et al.

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