环境氧化物对EB-PVD热障涂层残余应力的影响

陈智; 贾文斌; 赵凯; 黄红梅; 方磊

doi:10.13224/j.cnki.jasp.2019.04.017

环境氧化物对EB-PVD热障涂层残余应力的影响

doi: 10.13224/j.cnki.jasp.2019.04.017

南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室,南京 210016

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出版历程
- 收稿日期: 2018-06-21
- 刊出日期: 2019-04-28

Influence of CMAS on residual stresses of EB-PVDthermal barrier coating system

摘要

摘要: 通过建立EB-PVD涂层的柱状晶模型,系统地研究了CMAS沉积和渗透对残余应力的影响。结果表明:CMAS的沉积和渗透产生了很大的面内、面外拉应力,导致垂直、水平裂纹的萌生;随着裂纹扩展,最终涂层发生剥落和分层失效。该失效主要发生在TC层表面下方、CMAS渗透交界处、陶瓷/黏结(TC/BC)界面附近。
- 电子束物理气相沉积(EB-PVD) /
- 热障涂层(TBC) /
- 残余应力 /
- 环境氧化物(CMAS) /
- 有限元法 /
- 失效模式
Abstract: A finite element model of electron beam-physical vapor deposition (EB-PVD) thermal barrier coating (TBC) considering crystalline columns was developed, the influence of CMAS deposition and penetration on residual stresses was systematically studied. The results showed that large in-plane and out-of-plane residual tensile stresses were induced by CMAS deposition and penetration, the vertical and horizontal cracks were easily initiated and propagated, finally TBC failed due to the spall off and delamination. These failure modes mainly happened at three regions: closely beneath the surface of TC, the interface between CMAS penetration and none penetration zone, and close to the top coating/bond coating(TC/BC) interface.
- electron beam-physical vapor deposition(EB-PVD) /
- thermal barrier coating (TBC) system /
- residual stresses /
- calcium-magnesium-alumino-silicate (CMAS) /
- finite element method /
- failure mode

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