CBN/CBN composite masses and their preparation

Details CBN/CBN composite masses and their preparation CBN/CBN composite masses and their preparation

1990-12-20

1992-04-21

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

51307, 51309, C04B 3558

Patent

active

051067927

ABSTRACT:
Broadly, the present invention is directed to a high pressure/high temperature (HP/HT) process for making polycrystalline CBN composite masses from graphitic boron nitride (GBN) in the substantial absence of catalytically-active material. The present invention specifically comprises subjecting a mixture of different structural forms of GBN to simultaneous conversion of each for making a CBN/CBN composite mass. Pyrolytic boron nitride/hexagonal boron nitride (PBN/HBN) mixtures are ideally suited for conversion into the inventive CBN/CBN composite masses of the present invention.

REFERENCES:
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patent: 3212852 (1965-10-01), Bundy
patent: 3233988 (1966-02-01), Wentorf, Jr et al.
patent: 3743489 (1973-07-01), Wentorf, Jr. et al.
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patent: 3918219 (1975-11-01), Wentorf, Jr. et al.
patent: 4188194 (1980-02-01), Corrigan
patent: 4289503 (1981-09-01), Corrigan
patent: 4349517 (1982-09-01), Lysanov et al.
patent: 4389223 (1983-06-01), Corrigan

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