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Characterization of Liquid Phase Sintered SiC Ceramics with Oxide Additive Materials

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Abstract:

This paper dealt with the fabricating process of liquid phase sintered (LPS) SiC ceramics containing the oxide additives of Al2O3 and Y2O3, in conjunction with the evaluation of their mechanical properties. LPS-SiC ceramics was sintered at the temperature of 1820 oC under an applied pressure of 20 MPa and a pressure holding time of 2 hour. A commercial SiC powder with an average size of about 0.3 μm was used as a starting powder. LPS-SiC ceramics with additive composition ratios of 1.5 and 2.3 (Al2O3/Y2O3) represented an excellent density of about 3.2 Mg/m3. LPS-SiC ceramics had a flexural strength of about 800 MPa and a fracture toughness of about 8.0 MPa⋅m0.5 at an additive composition ratio (Al2O3/Y2O3) of 1.5.

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Periodical:

Key Engineering Materials (Volumes 326-328)

Pages:

1853-1856

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.326-328.1853

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Online since:

December 2006

Authors:

Sang Ll Lee, Yun Seok Shin, Jin Kyung Lee, Joon Hyun Lee, Jun Young Park

Keywords:

Liquid Phase Sintering (LPS), Mechanical Property, Microstructure, Oxide Additive, Silicon Carbide (SiC)

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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