Effects of Heating Rate on Alumina Grain Growth

作者：Xu Chongjun; Zhang Zhixiao; Zhang Jinyong^*; Liu Jianghao; Zhang Fan; Fu Zhengyi

来源：JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION, 2015, 30(1): 56-59.

DOI：10.1007/s11595-015-1100-2

• rapid heating rate
• SHS
• 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 different heating ratios (greater than 1 000 degrees C/min in SHS and about 50 degrees C/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.

• 单位
  武汉理工大学