Nano-Indentation of SiC and Si3N4/SiC Ceramic Materials

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The present paper deals with the nano-indentation of SiC-micro and Si3N4/SiCmicro/ nano ceramic materials. The investigated SiC-micro and Si3N4/SiC-micro/nano ceramics were prepared by liquid phase sintering. Liquid phase was formed from different sintering additives (Y2O3, Yb2O3, Sm2O3). In the case of Si3N4/SiC-micro/nano ceramics the SiC nano-grains were created from SiNC amorphous powder. SiNC precursor decomposed to SiC and Si3N4 particles during sintering. The comparison of nano- and macro-hardness of investigated ceramic materials showed that nano-hardness is significantly higher. The indentation modulus correlated with the measured nano-hardness. Remarkable influence of grain boundaries and SiC nano-inclusions on hardness was observed.

Info:

Periodical:

Edited by:

J. Dusza, R. Danzer and R. Morrell

Pages:

272-275

DOI:

10.4028/www.scientific.net/KEM.290.272

Citation:

M. Balog et al., "Nano-Indentation of SiC and Si3N4/SiC Ceramic Materials", Key Engineering Materials, Vol. 290, pp. 272-275, 2005

Online since:

July 2005

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$35.00

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