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

✍ Scribed by Byung-Nam Kim; Keijiro Hiraga; Koji Morita; Hidehiro Yoshida

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
599 KB
Volume
29
Category
Article
ISSN
0955-2219

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✦ Synopsis

Commercial alumina powder was densified by spark plasma sintering (SPS) at 1150 β€’ 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 β€’ C/min, the grain size was 0.29 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.

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