Effects of Heating Rate on Alumina Grain Growth

A rapid-heating method in the absence of electric/magnetic field was achieved by introducing a self-propagating-combustion （SHS） as heating source. The effect of heating rate on the alumina grain growth was explored based on this rapid-heating method. Comparing with the alumina prepared by two diffe...

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Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2015-02, Vol.30 (1), p.56-59
Main Authors: Xu, Chongjun, Zhang, Zhixiao, Zhang, Jinyong, Liu, Jianghao, Zhang, Fan, Fu, Zhengyi
Format: Article
Language:English
Subjects:
Advanced Materials
Aluminum oxide
Chemistry and Materials Science
Grain growth
Heating
Heating rate
Loose powder sintering
Magnetic fields
Materials Science
Pressureless sintering
Self-propagating synthesis
加热方法
加热速度
升温速率
晶粒生长抑制剂
晶粒生长模型
氧化铝
烧结过程
自蔓延燃烧
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Summary:A rapid-heating method in the absence of electric/magnetic field was achieved by introducing a self-propagating-combustion （SHS） as heating source. The effect of heating rate on the alumina grain growth was explored based on this rapid-heating method. Comparing with the alumina prepared by two different heating ratios （greater than 1 000 ℃/min in SItS and about 50 ℃/min in common pressureless sintering furnace）, it was revealed that the rapid heating could promote the grain growth greatly without pressure during sintering. However, if a pressure was applied simultaneously, the grain growth would be almost completely restrained. Since these observations are quite different from the expectation, a new grain growth model was proposed.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-015-1100-2