考虑孔隙细观特征的热障涂层脱粘缺陷超声检测数值模拟

发布时间：2018-01-29 14:27

本文关键词： 热障涂层脱粘孔隙细观特征随机孔隙模型超声检测数值模拟　出处：《中国表面工程》2017年03期 　论文类型：期刊论文

【摘要】：为探究孔隙细观形貌对热障涂层脱粘缺陷超声检测定量精度的影响,基于电子束物理气相沉积法制备的厚度约为100μm的ZrO_2-7%Y_2O_3(7YSZ)热障涂层SEM形貌,建立了界面脱粘尺寸0.2~2.0 mm、孔隙率范围0%~5%、孔隙平均宽高比分别为4∶10、6∶10、8∶10和10∶10的多组热障涂层二维随机孔隙模型(Random void model,RVM),采用时域有限差分技术进行了超声检测数值模拟。结果表明:当涂层厚度一定时,涂层声压反射系数幅度谱极值与脱粘尺寸呈线性关系,脱粘尺寸超声定量误差随孔隙率和孔隙平均宽高比的增加而增大,当涂层孔隙率为5%时,超声测量最大相对误差已达到37.7%,孔隙平均宽高比增大为10:10时,超声测量最大相对误差达到36.9%。此外,由于受孔隙分布状态的影响,超声定量结果呈现出一定的波动性。
[Abstract]:In order to investigate the effect of pore morphology on ultrasonic detection accuracy of thermal barrier coating debonding defects. Based on the electron beam physical vapor deposition method, the SEM morphology of the thermal barrier coating prepared by the electron beam physical vapor deposition method is about 100 渭 m thick ZrOs _ 2-7and Ys _ 2O _ 3 / 7YSZ. The interfacial debonding size is 0.2 ~ 2.0 mm, the porosity range is 0 ~ 5 and the average ratio of width to height is 4: 10 ~ 6: 10, respectively. At 8:10 and 10:10, a two-dimensional random void model of multi-group thermal barrier coating (RVM) was developed. Numerical simulation of ultrasonic testing was carried out by using finite-difference time-domain technique. The results show that when the thickness of the coating is constant, the maximum value of the amplitude spectrum of the sound pressure reflection coefficient of the coating is linearly related to the dimension of debonding. The ultrasonic quantitative error of debonding size increases with the increase of porosity and the average ratio of width to height of porosity. When the porosity of coating is 5, the maximum relative error of ultrasonic measurement has reached 37.7%. The maximum relative error of ultrasonic measurement reaches 36.9 when the average ratio of width to height of the pore increases to 10:10. In addition, due to the influence of pore distribution, the quantitative ultrasonic results show certain volatility.
【作者单位】：大连理工大学无损检测研究所;大连理工大学材料科学与工程学院;
【基金】：国家自然科学基金(U1508218,51675083)~~
【分类号】：TG115.285;TG174.4
【正文快照】： 引文格式:张伟,马志远,高剑英,等.考虑孔隙细观特征的热障涂层脱粘缺陷超声检测数值模拟[J].中国表面工程,2017,30(3):115-121.ZHANG W,MA Z Y,GAO J Y,et al.Ultrasonic testing numerical simulation of debonding defect in thermal barrier coatings consideringvoid micr

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