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Development of Life Predictive Method For Thermal Barrier Coating Systems

热障涂层系统寿命预测方法的开发

基本信息

批准号：
09555027
负责人：
HASHIDA Toshiyuki
金额：
$ 5.89万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555027/
关键词：
Gas Turbine Thermal Barrier Coating Rotar Blade Plasma Splay EB-PVD Laser heating Thermal Fatigue Interface Fracture Mechanics

项目摘要

The objective of this research is to develop evaluation methods of charcterizing thermal barrier coating (TBC) systems and predictive methodology of their life with special reference to a leading edge of advanced gas turbine blades, The research results are summarized for the following individual task.Task (1) Preparation of TBC specimens : TBC specimens with a top coat of ZrO and a bond coat of NiCrAlY were prepared by air plasma splay and electron beam-physical vapor deposition techniques. The specimen geometry was a cylindrical tube for simulating the curvature of leading edges and the substrate was a Ni-based superal loy.Task (2) Evaluation of interface properties(2-1) Thermal shock/fatigue tests were conducted on the cylindrical specimens with the TBCs using a laser heating method. A air-forced cooling cycle was employed to simulate the thermal transient history during trips. An acoustic emission method was used to examine the fracture process in the laser heating experiment. It w … More as shown from the AE monitoring that the buckling of the top coating layer induced the final spallation of the TBC system. Furthermore, the effect of high-temperature oxidation on the spallation was evaluated in terms of the thermal gradient within the TBC and the number of cycles to failure.(2-2) Thermal stress analyses using a FEM method were performed with reference to the cylindrical specimen geometry. The interface crack was accounted for in the thermal stress analyses. The stress intensity factor was determined as a function of interfacial crack length which formed a foundation for the analysis of the spallation behavior of the TBCs.Task (3) The experimental data of interface crack growth obtained from the laser heating thermal shock/fatigue tests were used to produce the fracture mechanics based relationship of fatigue crack growth rate through the interfacial crack stress intensity factor as determined by the FEM, The relationship was then used to reproduce the fracture process in the laser heating experiment. It was demonstrated that the predicted critical interfacial crack length was close to that observed in the laser heating experiment, indicating the validity of the fracture mechanics based life predictive method. Less

本研究的目的是发展热障涂层（TBC）系统的特性评估方法及其寿命预测方法，特别是针对先进燃气涡轮机叶片的前缘。研究结果总结如下：任务（1）TBC试样的制备：采用空气等离子体喷涂和电子束物理气相沉积技术制备了表面为ZrO、粘结层为NiCrAlY的TBC试样。试样的几何形状为模拟前缘曲率的圆柱形管，基底为Ni基超合金。任务（2）界面性能的评价（2-1）使用激光加热法对带有热障涂层的圆柱形试样进行热冲击/疲劳试验。采用空气强制冷却循环来模拟跳闸过程中的热瞬态过程。采用声发射方法对激光加热过程中的断裂过程进行了研究。它w ...更多信息声发射监测结果表明，热障涂层的最终开裂是由于顶部涂层的屈曲引起的。此外，根据TBC内的热梯度和失效循环次数，评估了高温氧化对Spectrometry的影响。(2-2)参考圆柱形试样的几何形状，使用有限元方法进行热应力分析。在热应力分析中考虑了界面裂纹。利用激光加热热冲击/疲劳试验获得的界面裂纹扩展实验数据，通过有限元法确定的界面裂纹应力强度因子，建立了基于断裂力学的疲劳裂纹扩展速率关系式。利用该关系再现了激光加热实验中的断裂过程。结果表明，所预测的临界界面裂纹长度与激光加热实验结果接近，表明基于断裂力学的寿命预测方法的有效性。少

项目成果

期刊论文数量（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

河済昌,橋田俊之,庄子哲雄,河合久孝,佐藤実,橋本英雄: "遮熱セラミックスコーティングの界面破壊特性に及ぼす高温酸化の影響に関する研究" 日本機械学会第75期通常総会講演会講演論文集(II). No.98-1. 652-653 (1998)

Sashimasa Kawa、Toshiyuki Hashida、Tetsuo Shoko、Hisataka Kawai、Minoru Sato、Hideo Hashimoto：“高温氧化对热障陶瓷涂层界面断裂性能的影响研究”日本学会第75届常会会议记录机械工程师（II）第 98-1 号（1998 年）。