Transparent AlN ceramics sintered from nanopowders produced by the wet chemical method

Ming XIANG; Youfu ZHOU; Wentao XU; Xiaoqiang LI; Kun WANG; Wei PAN

doi:10.2109/jcersj2.17271

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Transparent AlN ceramics sintered from nanopowders produced by the wet chemical method

Ming XIANG, Youfu ZHOU, Wentao XU, Xiaoqiang LI, Kun WANG, Wei PAN

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Keywords: Nanopowders, Sintering additive, Microstructure, Transparency, Thermal conductivity

JOURNAL FREE ACCESS

2018 Volume 126 Issue 4 Pages 241-245

DOI https://doi.org/10.2109/jcersj2.17271

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Abstract

Transparent aluminum nitride (AlN) ceramics were sintered by the hot-pressing (HP) method. Comparison has shown that AlN ceramics fabricated using as-prepared nanopowders exhibit relatively high transparency, while AlN ceramics prepared using commercial micro-powders seem almost opaque. The influences of different sintering additives on the phase composition, densification behavior, microstructure, transparency and thermal conductivity of AlN ceramics were investigated. X-ray diffraction and scanning electron microscope analyses revealed that AlN ceramics with fluoride additives exhibited the pure AlN phase, while secondary phases were observed when using oxide additives. The microstructure, especially the distribution of secondary phases and porosity, played an important role, moreover in the transparency and thermal conductivity. Thus, the transmittance and thermal conductivity of ceramics with a 3 wt % CaF₂ additive were higher than others.

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