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Effect of Y2O3, La2O3 and MgO Co-Doping on Densification, Microstructure and Properties of AlON Ceramics
J. Zhang1, J. Lei1,2, Y. Shi1, J. Xie1, F. Lei1, L. Zhang1
1 Department of Electronics and Information Materials, School of Material Science and Engineering, Shanghai University, Shanghai 200444, China
2 Ceramic Department, Shanghai FRP Research Institute Co.Ltd., Shanghai 201404, China
received December 6, 2016, received in revised form January 29, 2017, accepted Febuary 10, 2017
Vol. 8, No. 1, Pages 177-182 DOI: 10.4416/JCST2016-00114
Abstract
The densification of transparent AlON ceramics was investigated with the aid of Y2O3, La2O3 and MgO as sintering agents. It was found that the density of the AlON ceramics obtained after co-doping with Y2O3 and La2O3 could be further improved with the addition of a small amount of MgO. The relative density of the AlON ceramic reached 99.9 % when it was co-doped with 0.08 wt% Y2O3 + 0.02 wt% La2O3 +0.2 wt% MgO after undergoing pressureless sintering at 1900 °C for 24 h. It is argued that Y3+ and Mg2+ can decelerate grain boundary mobility, suppress grain growth and promote the elimination of pores.
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Keywords
Transparent γ-AlON ceramics, pressureless sintering, co-doping
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