科研之友
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摘要
Various methods of aluminum nitride (AlN) crystal growth have been attempted since AlN was first recognized as a ceramic material with remarkable properties, but no efficient method has yet been established. However, AlN is a well. known inclusion in the steelmaking process, and AlN crystal growth occurs in molten steel containing Al and N. This fact indicates that the crystal growth of AlN can easily occur in liquid iron alloy, but so far the role of the liquid iron has not been elucidated. In this work, the authors propose a new mechanism for AlN growth in molten iron, in which AlN crystals nucleate and grow at the interface between liquid iron and a solid Al2O3 substrate to decrease the large interfacial free energy between them. To investigate the interfacial chemistry between the liquid metal and solid oxide, we successfully produced needle-like, micro-size AlN crystals at the interface of molten iron and solid alumina by blowing N-2 gas through a liquid iron alloy containing Al. We discuss the mechanism for the formation of various AlN crystal shapes at the interface between molten iron and solid alumina.
- 出版日期2015
