Journal of Inorganic Materials ›› 2020, Vol. 35 ›› Issue (6): 669-674.DOI: 10.15541/jim20200078

Special Issue: 结构陶瓷论文精选(二)

• RESEARCH PAPER • Previous Articles     Next Articles

Effects of Impurities on Properties of YSZ Thermal Barrier Coatings

JI Xiaojuan1,2,YU Yueguang2(),LU Xiaoliang2   

  1. 1. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
    2. BGRIMM Technology Group, Beijing 100160, China
  • Received:2020-02-18 Revised:2020-03-01 Published:2020-06-20 Online:2020-03-05
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  • Supported by:
    National Key Technology Research and Development Program(2012BAE02B02)

Abstract:

Reducing low-melting impurity content in thermal barrier coatings (TBCs) can improve the high temperature stability and service life of coatings. But there is rare quantitative study on the relationship between the low-melting impurity content and coating properties. In the present work, the effect of SiO2, Al2O3, and Fe2O3 impurities on the properties of Yttria-Stabilized Zirconia (YSZ) TBCs prepared by atmospheric plasma spraying was investigated. The samples were prepared with the contents of these impurities being increased gradually from less than 0.01wt% to 1.00wt%. The results demonstrated that those low-melting oxide impurities exhibit a significant effect on thermal conductivity and porosity of the coatings, playing a key role on thermal shock failure. The performance of coatings deteriorated especially significantly when the impurity oxide content is less than 0.2wt%.

Key words: thermal barrier coating, impurity, YSZ, thermal shock resistance, thermal conductivity

CLC Number: