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Lossy AlN–SiC composites fabricated by spark plasma sintering

Published online by Cambridge University Press:  03 March 2011

Xiang-Yu Zhang ,
Shou-Hong Tan ,
Jing-Xian Zhang ,
Dong-Liang Jiang ,
Bo Hu  and
Chen Gao
Xiang-Yu Zhang*
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
Shou-Hong Tan
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
Jing-Xian Zhang
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
Dong-Liang Jiang
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
Bo Hu
Affiliation:
National Synchrotron Radiation Laboratory and Department of Physics, University of Science and Technology of China, Hefei 230026, People’s Republic of China
Chen Gao
Affiliation:
National Synchrotron Radiation Laboratory and Department of Physics, University of Science and Technology of China, Hefei 230026, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Dense lossy AlN–SiC composites doped with Y2O3 were fabricated by spark plasma sintering (SPS). Both the microstructure and the dielectric properties are different from those of hot-pressed samples. Microstructure analysis reveals little solid solution (AlN)x(SiC)1-x is formed. Scanning evanescent microwave microscopy images show that the materials by SPS exhibit large contrast in dielectric permittivity, whereas the hot-pressed materials show very mild fluctuation in dielectric permittivity over the samples. The results indicate that AlN–SiC composites fabricated by SPS can be treated approximately as a mechanical mixture of AlN and SiC when estimating complex permittivity of the composite in the microwave range. The complex permittivity of the composites with different SiC contents can be phenomenologically predicted by effective medium approximation.

Keywords

Rapic solidificationScanning probe microscopy (SPM)Dielectric properties
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 9 , September 2004 , pp. 2759 - 2764
Copyright
Copyright © Materials Research Society 2004

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