C - Chemistry – Metallurgy – 30 – B
Patent
C - Chemistry, Metallurgy
30
B
C30B 29/04 (2006.01) B21C 3/02 (2006.01) C23C 16/27 (2006.01) C30B 25/02 (2006.01)
Patent
CA 2076087
60SD00546 ISOTOPIC DIAMOND COATED PRODUCTS AND THEIR PRODUCTION ABSTRACT OF THE DISCLOSURE Broadly, the-present invention is directed to a diamond product comprising a core of diamond containing at least about 1 wt-% 13C and an epitaxial diamond coating on said core containing at least 1 wt-% less 13C than is contained in said diamond core. The diamond core will have a lattice parameter that is smaller than the lattice parameter of the diamond coating. When the coating is forced to grow epitaxially so that it must have the same lattice constant as the diamond core, she coating will be placed under compression. Since 13C diamond has the smallest lattice parameter known and the lattice parameter of diamond is a function of isotopic composition, the diamond core should contain more 13C than is contained in the coating in order for the coating to be placed under compression. Accordingly, the diamond core can be composed of natural or synthetic diamond having a natural isotopic composition and the coating can be 12C or 13C. Alternatively, the core can be 13C and the coating 12C. When mixtures of isotopes comprise the core and/or coating, their composition should vary by at least 1 wt-% 13C with the higher incidence of 13C isotope being located in the core.
Company General Electric
Craig Wilson And Company
LandOfFree
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