Synthesis technology of spinel AlON
(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