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Microstructural Effects on the Hardness, Elastic Modulus and Fracture Toughness of CVD Diamond

Published online by Cambridge University Press:  10 February 2011

A. Kant ,
M. D. Drory ,
N. R. Moody ,
W. J. MoberlyChan ,
J. W. Ager  and
R. O. Ritchie
A. Kant
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory and Department of Materials Sciences Mineral Engineering, University of California, Berkeley, CA 94720
M. D. Drory
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory and Department of Materials Sciences Mineral Engineering, University of California, Berkeley, CA 94720
N. R. Moody
Affiliation:
Sandia National Laborataries, Livermore, CA 94551
W. J. MoberlyChan
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory and Department of Materials Sciences Mineral Engineering, University of California, Berkeley, CA 94720
J. W. Ager
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory and Department of Materials Sciences Mineral Engineering, University of California, Berkeley, CA 94720
R. O. Ritchie
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory and Department of Materials Sciences Mineral Engineering, University of California, Berkeley, CA 94720
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Abstract

The hardness, elastic modulus, and fracture toughness of chemical vapor deposited (CVD) polycrystalline diamond have been investigated on several thick (∼100 μm) free-standing films with regard to the grain size, impurity content and failure mechanisms. Micro-hardness measurements using Vickers indentation, in conjunction with Young's modulus measurement techniques such as nano-indentation, were employed to estimate the indentation fracture toughness. The toughness of CVD diamond was increased through the addition of non-diamond carbon, which promoted intergranular fracture and enhanced the toughness by grain bridging.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 505 , 1997 , 611
Copyright
Copyright © Materials Research Society 1998

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References

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