Highly Transparent AlON Pressurelessly Sintered from Powder Synthesized by a Novel Carbothermal Nitridation Method

Authors

  • Xihai Jin,

    1. The State Key Laboratory on High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Shanghai, China
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  • Lian Gao,

    Corresponding author
    • The State Key Laboratory on High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Shanghai, China
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    • Member, The American Ceramic Society.
  • Jing Sun,

    1. The State Key Laboratory on High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Shanghai, China
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  • Yangqiao Liu,

    1. The State Key Laboratory on High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Shanghai, China
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  • Linhua Gui

    1. The State Key Laboratory on High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Shanghai, China
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Author to whom correspondence should be addressed. e-mail: liangao@mail.sic.ac.cn

Abstract

Transparent AlON was pressurelessly sintered from powders synthesized by a two-step carbothermal nitridation method, using core-shell structured Al2O3/C mixture derived from the pyrolysis of an Al2O3/ureaformaldehyde-resin nanocomposite precursor as the starting material. It was found that the amorphous carbon layer on the Al2O3 particle surface could strongly retard the coalescence and growth of Al2O3 particles during the carbothermal nitridation process. As a result, the formation temperature and particle size of the AlON powder were significantly reduced. The AlON powder synthesized showed a bimodal particle size distribution at 0.2 and 0.7 μm and was well dispersed; its maximum particle size was below 0.9 μm. Under the aid of proper sintering additive, transparent AlON ceramics with an average in-line transmittance above 80% at visible to infrared range were obtained through pressureless sintering.

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