Effects of heating rate on microstructure and transparency of spark-plasma-sintered alumina

被引：143
作者：
Kim, Byung-Nam [1 ]
Hiraga, Keijiro [1 ]
Morita, Koji [1 ]
Yoshida, Hidehiro [1 ]
机构：
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2009年 / 29卷 / 02期
关键词：
Grain growth; Sintering; Porosity; Optical properties; Al2O3; GRAIN-GROWTH; DENSIFICATION; STRENGTH;
D O I：
10.1016/j.jeurceramsoc.2008.03.015
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：
Commercial alumina powder was densified by spark plasma sintering (SPS) at 1150 degrees C. During SPS processing, the effects of the heating rate were examined on microstructure and transparency. With decreasing heating rate, the grain size and the residual porosity decreased, while the transparency increased. At a heating rate of 2 degrees C/min, the grain size was 0.29 mu m, and the in-line transmission was 46% for a wavelength of 640 nm. The mechanisms for the fine microstructure and low porosity at slow heating, which are conflicting with some existing results, were explained by considering the role of defect concentration and grain-boundary diffusion during densification. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：323 / 327
页数：5
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