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Two-step preparation of AlON transparent ceramics with powder synthesized by aluminothermic reduction and nitridation method

Published online by Cambridge University Press:  12 September 2014

Ying Wang ,
Xiumin Xie ,
Jianqi Qi ,
Jun Wang ,
Di Wu ,
Xiaofeng Guo ,
Nian Wei  and
Tiecheng Lu
Ying Wang
Affiliation:
College of Physical Science and Technology, Sichuan University, Chengdu 610064, Sichuan, People's Republic of China; and Key Laboratory of High Energy Density Physics of Ministry of Education, Sichuan University, Chengdu 610064, Sichuan, People's Republic of China
Xiumin Xie
Affiliation:
College of Physical Science and Technology, Sichuan University, Chengdu 610064, Sichuan, People's Republic of China; and Key Laboratory of Radiation Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610064, Sichuan, People's Republic of China
Jianqi Qi*
Affiliation:
College of Physical Science and Technology, Sichuan University, Chengdu 610064, Sichuan, People's Republic of China; and Key Laboratory of High Energy Density Physics of Ministry of Education, Sichuan University, Chengdu 610064, Sichuan, People's Republic of China
Jun Wang
Affiliation:
School of Science, Sichuan University of Science and Engineering, Zigong 643000, Sichuan, People's Republic of China
Di Wu
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California, Davis, California 95616, USA
Xiaofeng Guo
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California, Davis, California 95616, USA
Nian Wei
Affiliation:
College of Physical Science and Technology, Sichuan University, Chengdu 610064, Sichuan, People's Republic of China; and Key Laboratory of High Energy Density Physics of Ministry of Education, Sichuan University, Chengdu 610064, Sichuan, People's Republic of China
Tiecheng Lu*
Affiliation:
College of Physical Science and Technology, Sichuan University, Chengdu 610064, Sichuan, People's Republic of China; and International Center for Material Physics, Chinese Academy of Sciences, Shenyang 110015, Liaoning, People's Republic of China
*
a)Address all correspondence to these authors. e-mail: qijianqi@scu.edu.cn
b)e-mail: lutiecheng@vip.sina.com
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Abstract

The aluminothermic reduction and nitridation method using microsized Al powder and nanosized alumina powder was employed to fabricate AlON powder under N2 atmosphere. Single-phase aluminum oxynitride (AlON) can be prepared at a relatively low temperature (1700 °C) with a holding time of 3 h. The powder is ball milled, doped with different amounts of Y2O3 (0.1–0.9 wt%) as a sintering additive, and then shaped into pellets. The pellet sintering is carried out at two relatively low temperatures (1860 and 1880 °C) for 10 h. The transmittance and hardness of the obtained samples varies as the amount of Y2O3 varies. The sample sintered under optimal conditions can reach an ultimate transmittance of 65% with 2 mm thickness. The Vickers hardness of highly transparent AlON ceramic is about 15.95 ± 0.17 GPa, indicating that our method has a promising future in transparent AlON ceramic production. The sintering promoting mechanisms of Y2O3 are also discussed in detail.

Keywords

AlON single-phase powderaluminothermic reduction and nitridation methodY2O3 sintering additive
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 19: Focus Issue: Optical Ceramics Science , 14 October 2014 , pp. 2325 - 2331
Copyright
Copyright © Materials Research Society 2014 

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