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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Synthesis technology of spinel AlON
WEI Chun-cheng(魏春城), TIAN Gui-shan(田贵山)

School of Material Science and Engineering, Shandong University of Technology, Zibo 255049, China

Abstract:The high-purity AlON ceramics, AlON/Al2O3 and AlON/AlN multiphase ceramics were prepared by pressureless sintering under nitrogen-based atmosphere with raw materials of Al2O3, AlN and Al powders. The compositions of the phase were determined by XRD, the fracture appearance was analyzed by SEM. The results indicate: the aluminum oxynitride phase in the AlON ceramics and other multiphase ceramics exist in the form of Al5O6N, whose solid-solution zone is 33.4%(mole fraction) AlN belonging to spinel structures. The average grain size of high-purity AlON is about 3 µm. The grain boundary is smooth without other phases. The density is 2.82 g/cm3, the microhardness (10 N) and about bending strength are 1 470 MPa and 94 MPa, respectively.

 

Key words: pressureless sintering; spinel; aluminum oxynitride; high-purity

ISSN 1672-7029
CN 43-1423/U

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