Hexagonal boron nitride powder having excellent sinterability an

Details Hexagonal boron nitride powder having excellent sinterability an Hexagonal boron nitride powder having excellent sinterability an

1986-06-30

1988-11-15

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

423290, C01B 21064

Patent

active

047849789

ABSTRACT:
The powder of hexagonal boron nitride is prepared by heat-treating a powdery mixture composed of an oxygen-containing boron compound, e.g. boric acid, and a nitrogen compound, e.g. dicyandiamide and melamine, with admixture of minor amounts of a carbonaceous powder, e.g. carbon black, and/or borax. Further, an alkaline earth metal compound such as calcium carbonate is added either to the powdery mixture of the starting materials before the heat treatment or to the powder after the heat treatment. The h-BN powder has excellent sinterability so that sintered bodies of boron nitride having a high density and high bending strength can readily be prepared by use of a hot press.

REFERENCES:
patent: 3415625 (1968-12-01), Babl et al.
patent: 3473894 (1969-10-01), Babl et al.
patent: 4107276 (1978-08-01), Schwetz et al.
patent: 4562163 (1985-12-01), Endo

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