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Fabrication of machinable AlN–BN composites with high thermal conductivity by pressureless sintering turbostatic BN-coated AlN nanocomposite powders

Published online by Cambridge University Press:  31 January 2011

Takafumi Kusunose ,
Tohru Sekino ,
Yoichi Ando  and
Koichi Niihara
Takafumi Kusunose*
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 562-0047, Japan
Tohru Sekino
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 562-0047, Japan
Yoichi Ando
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 562-0047, Japan
Koichi Niihara
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 562-0047, Japan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

To impart machinability to hard and brittle AlN ceramics without losing their high thermal conductivity, a homogeneous dispersion of fine BN particles in an AlN matrix was investigated. A homogeneous dispersion of BN particles was obtained by pressureless sintering of turbostatic BN-coated AlN nanocomposite powder (AlN–BN nanocomposite powder), which was prepared by reducing and heating AlN particles containing a mixture of boric acid, urea, and carbon. Though AlN is slightly oxidized by boric acid during the reduction, the addition of carbon reduced the oxygen content of the AlN–BN composite powder by carbothermal reduction of the oxidized AlN particles. As a result, the thermal conductivity of the sintered material increased with decreasing oxygen content of the nanocomposite powder. AlN–BN nanocomposites containing more than 20 vol% BN showed high strength, machinability, and relatively high thermal conductivity in comparison with the conventional microcomposites.

Keywords

CeramicCompositeNitride
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 1 , January 2008 , pp. 236 - 244
Copyright
Copyright © Materials Research Society 2008

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