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Elastic Properties of CVD Diamond Via Dynamic Resonance Measurements

Published online by Cambridge University Press:  15 February 2011

Mark P. D'Evelyn ,
David E. Slutz  and
Bradley E. Williams
Mark P. D'Evelyn
Affiliation:
General Electric Corporate Research and Development, P.O. Box 8, Schenectady, NY 12301
David E. Slutz
Affiliation:
General Electric Superabrasives, P.O. Box 568, Worthington, OH 43085
Bradley E. Williams
Affiliation:
General Electric Superabrasives, P.O. Box 568, Worthington, OH 43085
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Abstract

Control of the mechanical properties of CVD diamond is essential to achieve optimal performance in various applications. While several methods have been applied to the measurement of the Young's modulus of thick-film CVD diamond, in general these methods are not suitable for diamond characterization on a production scale. In addition, many of these methods cannot determine the shear modulus (or Poisson's ratio), which is necessary for a complete description of the elastic properties. We have developed a simple dynamic resonance method for determining both the Young's and shear modulus of free-standing CVD diamond in the shape of rectangular plates or round disks. The specimen is supported along nodal lines of flexural or torsional modes. Oscillations induced by impact from a falling ceramic bead are sensed by a microphone, and the resonant frequencies are determined by a signal analyzer. The Young's and shear modulus are calculated from the frequencies of the fundamental flexural and torsional modes, respectively, using quasi-analytic formulas. CVD diamond grown by several methods routinely achieves Young's and shear modulus values above 1000 GPa and 500 GPa, respectively, in good accord with theoretical values for pure polycrystalline diamond.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 383: Symposium I – Mechanical Behavior of Diamond and Other Forms of Carbon , 1995 , 115
Copyright
Copyright © Materials Research Society 1995

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References

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