无机材料学报 ›› 2017, Vol. 32 ›› Issue (8): 819-824.DOI: 10.15541/jim20160554

• • 上一篇    下一篇

Al2O3/BaZrO3双陶瓷界面微观组织演化及机理

张 浩1, 2, 3, 高鹏越1, 2, 3, 陈光耀1, 2, 3, 李明阳1, 2, 3, 鲁雄刚1, 2, 3, 4, 李重河1, 2, 3, 4   

  1. (1. 上海大学 省部共建高品质特殊钢冶金与制备国家重点实验室, 上海 200072; 2. 上海大学 上海市钢铁冶金新技术开发应用重点实验室, 上海 200072; 3. 上海大学 材料科学与工程学院, 上海 200072; 4. 上海特种铸造工程技术研究中心, 上海 201605)
  • 收稿日期:2016-10-08 修回日期:2016-11-21 出版日期:2017-08-10 发布日期:2017-07-19
  • 作者简介:张 浩(1991–), 男, 硕士研究生. E-mail: zhanghao0829@i.shu.edu.cn
  • 基金资助:
    国家自然科学基金(51574164, 51374142);国家重点基础研究发展计划(973计划) (2014CB643403);上海市科委基础重点项目(14JC1491400)

Microstructure Evolution and Mechanism of Al2O3/BaZrO3 Double Ceramics

ZHANG Hao1,2,3, GAO Peng-Yue1,2,3, CHEN Guang-Yao1,2,3, LI Ming-Yang1,2,3, LU Xiong-Gang1,2,3,4, LI Chong-He1,2,3,4   

  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)

摘要:

以Al2O3为背层(硅溶胶为粘结剂), 电熔BaZrO3作为面层材料(钇溶胶为粘结剂), 1550℃烧结后制成50 mm×25 mm×5 mm的Al2O3/BaZrO3双陶瓷试样。通过光学显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)和EDS等手段观察了BaZrO3层和Al2O3/BaZrO3界面的显微结构, 研究了BaZrO3与Al2O3的界面反应。结果表明, 面层由BaZrO3基体和分布其上的大小10 μm左右的Y稳定的ZrO2晶粒组成; Al2O3/BaZrO3界面发生反应形成厚约300 μm的过渡层, 界面反应生成物有BaOAl2O3、ZrO2和BaO·Al2O3·2SiO2。界面从单纯的BaZrO3/Al2O3双陶瓷结构演变为BaZrO3、ZrO2、BaO·Al2O3、BaO·Al2O3·2SiO2和Al2O3等多种物相组成的复杂结构。反应过程中Al元素基本不迁移扩散, BaZrO3中Ba元素向Al2O3所在的位置扩散形成BaO·Al2O3, 残留物形成一层条状ZrO2, 而BaO·Al2O3·2SiO2围绕着EC95(Al2O3+5%SiO2)粉体颗粒周围生成。

关键词: Al2O3, BaZrO3, 界面反应, 双陶瓷

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

中图分类号: