Kinetics of Phase Change in Explosively Shock‐Treated Alumina
作者:
E. K. Beauchamp,
M. J. Carr,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1990)
卷期:
Volume 73,
issue 1
页码: 49-53
ISSN:0002-7820
年代: 1990
DOI:10.1111/j.1151-2916.1990.tb05089.x
出版商: Blackwell Publishing Ltd
关键词: alumina;phase transformations;shock;processing;kinetics
数据来源: WILEY
摘要:
The effect of shock treatment on the kinetics of transformation of transition‐phase alumina has been examined. Alumina powder, consisting of spherical particles produced by melting and quenching, was shock‐treated at 13‐ to 26‐GPa maximum pressure and subsequently heat‐treated at 1000° and 1050°C for various times. At 1050°C, the transformation of unshocked powder was typical of other aluminas with an incubation period of 60 min before significant conversion occurred. In contrast, in the shock‐treated material, no incubation period was observed and the α‐phase content increased exponentially with time. The growth kinetics of the shocked powder corresponded to a linear growth process with an activation energy of 482 kJ/mol. TEM examination revealed α‐phase morphologies consisten
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