Boron nitride system including an hBN starting material with a c

Details Boron nitride system including an hBN starting material with a c Boron nitride system including an hBN starting material with a c

1993-04-13

1994-07-26

Wyszomierski, George

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428457, 428698, 501 96, B32B 1504

Patent

active

053326296

ABSTRACT:
A boron nitride system starts with an hBN material and yields a directly converted sintered cBN body having a high heat conductivity within the range of at least 4 W/cm..degree.C. to about 6.2 W/cm..degree.C. For this purpose the hBN starting material of the system has diffused therein an additive of an alkaline earth metal or alkali metal in an amount of from 0.6 mol % to 1.3 mol %. This starting material is directly converted into the cBN at a sintering temperature of at least 1350.degree. C. under a thermodynamically stabilized condition for the cBN, which contains cBN within the range of 99.9 to 99.3 wt. % of the sintered body and a metal remainder from the additive of the starting material within the range of 0.1 to 0.7 wt. % of the sintered body, except for minute naturally occurring components.

REFERENCES:
patent: 4188194 (1980-02-01), Corrigan
patent: 4469802 (1984-09-01), Endo et al.
patent: 4906528 (1990-03-01), Cerceau et al.
patent: 5011790 (1991-04-01), Degawa et al.
Vol. 34, J. Phys. Chem Solids, 1972, G. A. Slack "Nonmetallic Chrystals With High Thermal Conductivity" pp. 321-334.
Vol. 7, Mat. Res. Bull, 1972, M. Wakatsuki et al. "Synthesis of Polycrystalline Cubic BN", pp. 999 . . . 1003.
"Chemical Vapor Deposited Materials For Electron Tubes", Apr. 1969, S. R. Steele et al., pp. 29, 43-48.

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