Synthesis of nanocrystalline yttria powder and fabrication of transparent YAG ceramics

被引:174
作者
Wen, L [1 ]
Sun, XD
Xiu, Z
Chen, SW
Tsai, CT
机构
[1] Northeastern Univ, Sch Mat & Met, Shenyang 110004, Peoples R China
[2] Florida Atlantic Univ, Dept Engn Mech, Boca Raton, FL 33431 USA
基金
中国国家自然科学基金;
关键词
powders-chemical preparation; sintering; transparency; YAG; Y2O3;
D O I
10.1016/j.jeurceramsoc.2003.09.001
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Synthesis of nanocrystalline yttria powder from Y(NO3)(3) solution and ammonia water was investigated. It was found that the precursor precipitate is Y-2(OH)(5)(NO3).H2O. The addition of small amount of ammonia sulfate in yttrium nitrate solution can reduce the agglomeration and particle size of the produced yttria powders. Nanocrystalline yttria powder (60 nm in average size) was obtained by calcining the precursor at 1100 degreesC for 4 h. Using this yttria powder and a commercial ultrafine Al2O3 powder, fully transparent YAG ceramics was fabricated by vacuum sintering at 1700 degreesC for 4 h through a solid-state reaction method. It was found that the addition of 0.5 wt.% tetraethyl orthosilicate (TEOS) is suitable for the fabrication of transparent YAG ceramics. If the amount of TEOS is less than 0.05 wt.%, abnormal grain growth occurs, and pores are entrapped in the grains. If the amount of TEOS is more than 3 wt.%, large amount of liquid phase is yielded, leaving some residual inclusions at grain boundaries. These are detrimental for the transparency of YAG ceramics. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2681 / 2688
页数:8
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