High temperature fracture toughness and residual stress in thermal barrier coatings evaluated by an in-situ indentation method

文献类型： 外文期刊

第一作者： Qu, Zhaoliang

作者： Qu, Zhaoliang;He, Rujie;Fang, Daining;Qu, Zhaoliang;Wei, Kai;He, Qing;Wang, Shixing;Pei, Yongmao;Fang, Daining

作者机构：

关键词： TBCs; In-situ indentation method; High temperature fracture toughness; High temperature residual stress

期刊名称：CERAMICS INTERNATIONAL （ 影响因子：4.527； 五年影响因子：4.049 ）

ISSN： 0272-8842

年卷期： 2018 年 44 卷 7 期

页码：

收录情况： SCI

摘要： High temperature fracture toughness and residual stress are important for the evaluation of TBCs. In this paper, an in-situ high temperature indentation method was originally developed to investigate the high temperature fracture toughness and residual stress in a typical TBC, nanostructured 8 wt% yttria partially stabilized zirconia (YSZ) coating. The cracks caused by in-situ high temperature indentation tests were observed, and high temperature fracture toughness and residual stress were experimentally measured. The fracture toughness was measured to be 1.25, 0.91 and 0.75 MPa*m(1/2) at 25, 800 and 1000 degrees C, respectively. The residual stress was measured to be - 131.3, - 55.5 and - 45.5 MPa, correspondingly. Moreover, the residual stress and fracture toughness both decrease with increasing environmental temperature. It is also found that the fracture toughness without consideration of residual stress is significantly larger than the intrinsic fracture toughness, which may result from the compressive stress state.

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