Evaluation of delamination on thermal barrier coatings by stress measurement and addition of strengthening mechanism

通过应力测量和添加强化机制评估热障涂层的分层

• 批准号: 23760662
• 负责人: HASEGAWA Makoto
• 金额: $ 2.91万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23760662/
• 关键词: 界面強度; ひずみエネルギー解放率; 応力測定; 界面剥離; 塑性変形

Thermal barrier coating systems (TBCs) have been widely used to increase the operating temperature of hot section components in gas turbines blades and vanes. TBCs usually consists of outer oxide ceramics top coat (TC) layer and inner intermetallic bond coat (BC) layer in order to protect the Ni-base superalloy from high temperature and oxidation. During the service, TGO forms and this formation increases the residual stress of the coating. Delamination of TGO/BC interface occurs because of the increasing residual stress and finally TC layer spall off from the TBCs. In this research, local stress components were evaluated by Wilkinson method where the stresses were decided by the distortion of the EBSD pattern. Further, high toughened TBCs were formed by using the stress dissipation of the BC layer due to the low yield stress by heat treatment.

热屏障涂料系统（TBC）已被广泛用于增加燃气轮机叶片和叶片中热截面成分的工作温度。 TBC通常由氧化陶瓷外层涂层（TC）层和内部金属间粘结涂层（BC）层组成，以保护Ni-base Superaly合金免受高温和氧化的侵害。在服务期间，TGO形成和这种形成增加了涂层的残余应力。 TGO/BC界面的分层是由于残留应力增加而发生的，最后TC层从TBC中消失。在这项研究中，通过Wilkinson方法对局部应力成分进行了评估，在Wilkinson方法中，应力是通过EBSD模式的变形决定的。此外，由于热处理的屈服应力低，使用BC层的应力耗散来形成高韧性的TBC。