Bond Strength and Stress Measurements in Thermal Barrier Coatings
Bond Strength and Stress Measurements in Thermal Barrier Coatings
复制标题
热障涂层中的粘合强度和应力测量
DOI：
10.1115/97-gt-363
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
K. Vaidyanathan
中科院分区：
文献类型：
--
作者：
E. Jordan;M. Gell;Doug M. Pease;Leon L. Shaw;David R. Clarke;Vijay Gupta;B. Barber;K. Vaidyanathan
燃气涡轮发动机热障涂层的失效模式是在陶瓷与金属界面处或其附近发生剥落。我们提出导致这种失效的两个最重要因素是结合强度和结合应力随循环的变化。研究了五种测量陶瓷粘结涂层界面附近应力的方法以及四种结合强度测量方法。激光荧光法和改进的实验室X射线法在应力测量方面最具潜力，而有前景的结合强度测量方法是直接拉伸试验、人字形缺口断裂韧性和激光诱导超声剥落法。对于一组氧化钇稳定的氧化锆涂层单晶样品，确定了应力和强度随热循环的变化函数。测量到连接陶瓷和金属的氧化层中的残余压缩应力以及结合强度都随热循环次数的增加而降低。版权©1997，美国机械工程师协会
The failure mode for thermal barrier coatings in gas turbine engines is spallation at or near the ceramic to metal interface. We propose that the two most important factors leading to this failure are the change in the bond strength and bond stress with cycling. Five methods of measuring stress near the ceramic bond coat interface and four methods of bond strength measurement were investigated. Laser fluorescence and enhanced laboratory x-ray methods have the most potential for stress measurement, while the promising bond strength measurement methods are direct pull testing, chevron notch fracture toughness, and laser induced ultrasonic spallation. The stress and strength as a function of thermal cycles was determined for one set of yttria stabilized zirconia coated single crystal samples. Both a decreasing residual compression stress in the oxide layer that joins the ceramic to the metal and a decreasing bond strength were measured as a function of thermal cycles.Copyright © 1997 by ASME