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Hardness of cubic silicon nitride

Published online by Cambridge University Press:  31 January 2011

I. Tanakaa ,
F. Oba ,
T. Sekine ,
E. Ito ,
A. Kubo ,
K. Tatsumi ,
H. Adachi  and
T. Yamamoto
I. Tanakaa*
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606–8501, Japan
F. Oba
Affiliation:
Engineering Research Institute, The University of Tokyo, Bunkyo, Tokyo 113–8656, Japan
T. Sekine
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science, Namiki, Tsukuba 305–0044, Japan
E. Ito
Affiliation:
Institute for Study of the Earth's Interior, Okayama University, Misasa, Tottori 682–0193, Japan
A. Kubo
Affiliation:
Institute for Study of the Earth's Interior, Okayama University, Misasa, Tottori 682–0193, Japan
K. Tatsumi
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606–8501, Japan
H. Adachi
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606–8501, Japan
T. Yamamoto
Affiliation:
Department of Advanced Materials Science, The University of Tokyo, Bunkyo, Tokyo 113–8656, Japan
*
a)Address all correspondence to this author.[email protected]
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Abstract

We report that polycrystalline cubic-Si3N4 with a spinel structure and low oxygen concentration (<0.5 wt%) shows Vickers hardness of 43 GPa when measured with the indentation load of 10 mN. The hardness decreases with the increase of the indentation load, which can be ascribed to the presence of weak grain boundaries. The high hardness can be well explained by its large shear modulus as predicted by first-principles calculations.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 17 , Issue 4 , April 2002 , pp. 731 - 733
Copyright
Copyright © Materials Research Society 2002

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