Effects of Al2O3 phase composition on AlON powder synthesis via aluminothermic reduction and nitridation

Jianqi Qi; Ying Wang; Xiumin Xie; Yuezhong Wang; Jicheng Zhou; Nian Wei; Jun Wang; Di Wu; Tiecheng Lu

doi:10.3139/146.111032

Article

Effects of Al₂O₃ phase composition on AlON powder synthesis via aluminothermic reduction and nitridation

Jianqi Qi , Ying Wang , Xiumin Xie , Yuezhong Wang , Jicheng Zhou , Nian Wei , Jun Wang , Di Wu and Tiecheng Lu

Published/Copyright: April 12, 2014

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From the journal International Journal of Materials Research Volume 105 Issue 4

Abstract

Using micro-sized aluminum powder (11 wt.%) and nano-sized Al₂O₃ powder (89 wt.%) with five different phase compositions, AlON powders were synthesized at different temperatures in flowing-nitrogen atmosphere. Our results suggest that for starting materials with low γ-Al₂O₃/total Al₂O₃ ratio R (0 and 0.15), a calcination temperature of 1 750 °C is required to obtain single-phase AlON. This temperature is about 50 °C higher than for other batches starting with larger R values (0.5, 0.85, and 1.0). The AlON powders fabricated from reactants with a high R value in this work show narrower particle size distribution and better particle homogeneity than those prepared from batches with lower R values.

Keywords: Single-phase AlON powder; Aluminothermic reduction and nitridation method; Raw materials composition; Reaction process

* Correspondence address, Prof. Jianqi Qi, or Prof. Tiecheng Lu, Department of Physics, Sichuan University, 29 Wangjiang Road, Wuhou District, Chengdu, 610064, P. R. China, Tel: +86-028-85412322, Fax: +86-028-85412322, E-mail: qijianqi@scu.edu.cn, lutiecheng@scu.edu.cn

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Received: 2013-06-04

Accepted: 2013-11-21

Published Online: 2014-04-12

Published in Print: 2014-04-14

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https://doi.org/10.3139/146.111032

Keywords for this article

Single-phase AlON powder; Aluminothermic reduction and nitridation method; Raw materials composition; Reaction process