C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 16/26 (2006.01) C04B 35/80 (2006.01) C23C 16/01 (2006.01) C23C 16/27 (2006.01)
Patent
CA 2085660
RD-21,415 METHOD OF PRODUCING PRESTRESSED DIAMOND COMPOSITE FILMS BY CHEMICAL VAPOR DEPOSITION AND ARTICLES PRODUCED THEREFROM Abstract of the disclosure A method is disclosed for producing prestressed diamond composite articles having a reinforcing member therein. A mixture of a carbon compound such as methane and hydrogen is introduced into a conventional CVD chamber containing the reinforcing member maintained at a typical chemical vapor deposition temperature. The reinforcing member is centrally positioned between banks of filaments to substantially symmetrically deposit a diamond layer on the reinforcing member having a thermal coefficient of expansion equal to or greater than that of diamond. During the cooling of the diamond composite article, after a desired thickness of diamond layer is reached on the reinforcing member, it contracts more than the diamond layer. As a result, the diamond layer is prestressed by the compressive stresses provided by the thermal contraction of the reinforcing member. Additionally, since the reinforcing member is centrally disposed within the diamond article bending moments which are typically present in a conventionally made diamond article are absent. Thus, a crack free and distortion free diamond composite article having an improved structural strength is produced.
Anthony Thomas R.
Fleischer James F.
Company General Electric
Craig Wilson And Company
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