Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (8): 819-824.doi: 10.15541/jim20160554

• Orginal Article • Previous Articles     Next Articles

Microstructure Evolution and Mechanism of Al2O3/BaZrO3 Double Ceramics

Hao ZHANG1,2,3(), Peng-Yue GAO1,2,3, Guang-Yao CHEN1,2,3, Ming-Yang LI1,2,3, Xiong-Gang LU1,2,3,4(), Chong-He LI1,2,3,4()   

  1. 1. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China
    2. Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University, Shanghai 200072, China
    3. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
    4. Shanghai Special Casting engineering technology research center, Shanghai 201605, China
  • Received:2016-10-08 Revised:2016-11-21 Online:2017-08-10 Published:2017-07-19
  • About author:ZHANG Hao. E-mail: zhanghao0829@i.shu.edu.cn
  • Supported by:
    National Natural Science Foundation of China (51574164, 51374142);National Program on Key Basic Research Project (973 Program) (2014CB643403);Basic Major Research Program of Science and Technology Commission Foundation of Shanghai (14JC1491400)

Abstract:

The Al2O3/BaZrO3 double ceramics sample with size of 50 mm×25 mm×5 mm was prepared via sintering at 1550℃ by using Al2O3 as back layer (silica sol as binder), fused BaZrO3 as 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 (10 μm) uniformly distributed. The interface reaction between Al2O3 and BaZrO3, leads to form a 300 μm thick transition layer. Composed of BaAl2O4 (BaO·Al2O3) 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, BaO·Al2O3, and Al2O3. During the reaction, the element Ba of BaZrO3 migrates into the Al2O3 layer and forms BaO·Al2O3, then the residual becomes a strip-shaped ZrO2 layer. The element Al of Al2O3 almost does not diffuse, and the ternary oxides BaO·Al2O3·2SiO2 are formed around EC95(Al2O3+5%SiO2) particles.

Key words: Al2O3, BaZrO3, interfacial reaction, dual ceramic

CLC Number: 

  • TB34