科研之友
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摘要
The Al2O3/BaZrO3 double ceramics sample with size of 50 mm×25 mm×5 mm was preparedvia sintering at 1550℃ by using Al2O3 as back layer (silica sol as binder), fused BaZrO3as surface ceramics. The phase identification and crystal structure were determined by X-ray diffraction (XRD), while the microstructure and interfacial reaction were carried out by scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscope (EDS). SEM-EDS results show that the surface layer is mainly composed of BaZrO3 matrix, with tiny yttria-stabilized zirconia grains (10μm) uniformly distributed. The interface reaction between Al2O3and BaZrO3, leads to form a 300μm thick transition layer. Composed of BaAl2O4(BaOAl2O3) and ZrO2. Thus, the microstructure of interface transfers from a simple double ceramic Al2O3/BaZrO3 interface into a complex structure, which is composed of BaZrO3, ZrO2, BaOAl2O3, and Al2O3. During the reaction, the element Ba of BaZrO3 migrates into the Al2O3 layer and forms BaOAl2O3, then the residual becomes a strip-shaped ZrO2 layer. The element Al of Al2O3 almost does not diffuse, and the ternary oxides BaOAl2O32SiO2 are formed around EC95(Al2O3+5％SiO2) particles.
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单位上海大学
