Fatigue crack growth behavior of interface crack in thermal barrier coating

热障涂层界面裂纹的疲劳裂纹扩展行为

• 批准号: 10650077
• 负责人: MUTOH Yoshiharu
• 金额: $ 0.77万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650077/
• 关键词: Thermal barrier coating; Fatigue; Fatigue crack growth; Interface crack; 高温

(1) Thermal barrier coated samples with Co-base super alloy substrate, NiCoCrAlY bond coat and 8wt%Y2O3-ZrO2 top coat were prepared.(2) In order to perform a test of fatigue crack growth along interface between metal bond coat layer and ceramic top coat layer, a special jigs and specimens with starter notch introduced by EDM were developed.(3) An interface crack could be successfully introduced ahead of the notch and it propagated along interface region with coalescing to inherent pores.(4) Based on the results of BEM analysis, A crack along the interface between top coat and bond coat layers propagates under mixed mode conditions of mode I and mode II and mix mode ratio varies with crack extension.(5) The crack growth behavior along the interface of dissimilar materials is controlled by the parameter Ki, while it under mix mode in homogeneous materials is controlled by the parameter K θ max.(6) With increasing porosity of the top coat, Young's modulus decreases and hence K-value also decreases. However, since crack growth resistance also decreases, there will be the optimum porosity.

（1）用共同基板涂层的热屏障共同涂层，制备了质粘合式涂层8wt％Y2O3-ZRO2面涂层。 Notch沿界面区域沿着固有的结果进行了融合。材料的界面由参数Ki控制，而材料下的材料则由参数kθθ最大孔隙率控制。 ，会有毛孔孔隙率。