Single-crystal diamond of very high thermal conductivity

Details Single-crystal diamond of very high thermal conductivity Single-crystal diamond of very high thermal conductivity

1991-08-12

1994-05-10

Kunemund, Robert

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

117 41, 117 64, 117 79, 117915, C30B 2904

Patent

active

053104471

ABSTRACT:
Single-crystal diamond consisting of isotopically pure carbon-12 or carbon-13 has been found to have a thermal conductivity higher than that of any substance previously known, typically at least 40% higher than that of naturally occurring IIA diamond. It may be prepared by a method comprising an initial step of low pressure chemical vapor deposition employing an isotopically pure hydrocarbon in combination with hydrogen, followed by comminution of the diamond thus obtained and conversion thereof to single-crystal diamond under high pressure conditions.

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patent: 4617181 (1986-10-01), Yazu et al.
patent: 4816286 (1989-03-01), Hirose
Stromberg et al. "Sintering of Diamond at 1800.sup.e c-1900.sup.e c and 60-65 KBar", American-Ceramic Bulletin, vol. 49, No. 12 (1970) pp. 1030-1032.
Davies, Diamond (Bristol, England: Adam Hilger Ltd.), 1984, p. 138.
Seitz, "Isotropic Enhancement of Thermal Conductivity and Damage Thresholds in Diamond" papers given Feb. 6, 1987, at Lincoln Laboratories.
Berman et al., Diamond Research, 1976, 7-13, month unknown.
Seitz, SPIE vol. 969 Diamond Optics, 124, 127-137 (1988) month unknown.

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