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Microwave sintering and properties of AlN/TiB2 composites

Published online by Cambridge University Press:  31 January 2011

Geng-fu Xu ,
Yuval Carmel ,
Tayo Olorunyolemi ,
Isabel K. Lloyd  and
Otto C. Wilson Jr.
Geng-fu Xu
Affiliation:
Department of Materials and Nuclear Engineering, University of Maryland, College Park, Maryland 20742
Yuval Carmel
Affiliation:
Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742
Tayo Olorunyolemi
Affiliation:
Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742
Isabel K. Lloyd
Affiliation:
Department of Materials and Nuclear Engineering and Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742
Otto C. Wilson Jr.
Affiliation:
Department of Materials and Nuclear Engineering and Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742
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Abstract

The effect of TiB2 on the densification behavior and properties of microwave-sintered AlN/TiB2 ceramic was investigated. The densification of the composite was significantly retarded in nitrogen atmosphere due to strong nitridation of TiB2 compared to sintering in argon atmosphere. The densities of the AlN/TiB2 composites containing different amounts of TiB2 all reached 99% of the theoretical density during 2 h of sintering at 1850 and 1900 °C. Microstructure analysis revealed that the TiB2 particles were dispersed in the AlN matrix while AlN grains retained its contiguity. This microstructure led to a composite with superior properties; thermal conductivity as high as 149 W/(m K) was achieved. The microwave sintered composites are harder and tougher than pure AlN. Microwave-sintered AlN/TiB2 composite is a promising material for structural applications in which high thermal conductivity and controlled dielectric loss are important.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 1 , January 2003 , pp. 66 - 76
Copyright
Copyright © Materials Research Society 2003

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