Isotopically-pure carbon-12 or carbon-13 polycrystalline diamond

Details Isotopically-pure carbon-12 or carbon-13 polycrystalline diamond Isotopically-pure carbon-12 or carbon-13 polycrystalline diamond

1995-01-04

1996-07-30

Kunemund, Robert

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

117929, C01B 3106

Patent

active

055409040

ABSTRACT:
Broadly, the present invention is directed to polycrystalline diamond of improved thermal conductivity. The novel polycrystalline diamond consists essentially of at least 99.5 wt-% isotopically-pure carbon-12 or carbon-13. The inventive polycrystalline diamond is formed from at least 99.5 wt-% isotopically-pure carbon-12 or carbon-13. Single-crystal isotopically-pure carbon-12 and carbon-13 diamond are known to possess improved thermal conductivity. Polycrystalline diamond, however, possesses lower thermal conductivity patterns deleteriously impacted by, for example, impurities, isotopic effects, and grain boundary scattering. In fact, grain boundary scattering would lead the skilled artisan to believe that the thermal conductivity of polycrystalline diamond would be substantially unaffected by the isotopic nature of the diamond itself. Unexpectedly, however, isotopic effects were discovered to predominate in impacting the thermal conductivity of polycrystalline diamond consisting essentially of isotopically-pure carbon-12 or carbon-13. This is true whether the isotopically-pure polycrystalline diamond is grown directly or whether individual isotopically-pure carbon-12 or carbon 13 diamond crystals are subjected to sintering for forming a polycrystalline structure, e.g. layer or compact, thereof.

REFERENCES:
patent: 3850591 (1974-11-01), Wentorf
patent: 4707384 (1987-11-01), Schachner et al.
patent: 4740263 (1988-04-01), Imai et al.
patent: 4767608 (1988-08-01), Matsumoto et al.
patent: 4985227 (1991-01-01), Ito et al.
patent: 5094915 (1992-03-01), Subramaniam
Seitz, "Isotopic Enhancement of Thermal Conductivity and Damage Thresholds in Diamond" Papers given Feb. 6, 1987, at Lincoln Laboratories.

Affiliated with

Also associated with

Rating

Isotopically-pure carbon-12 or carbon-13 polycrystalline diamond does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Isotopically-pure carbon-12 or carbon-13 polycrystalline diamond, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Isotopically-pure carbon-12 or carbon-13 polycrystalline diamond will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1656366