基于声发射技术的Si-Cr-Ti高温抗氧化涂层弯曲失效机理研究

doi:10.15541/jim20210032

无机材料学报 ›› 2021, Vol. 36 ›› Issue (11): 1185-1192.DOI: 10.15541/jim20210032

所属专题：【结构材料】热障与环境障涂层

基于声发射技术的Si-Cr-Ti高温抗氧化涂层弯曲失效机理研究

张亚晨¹^,²(), 孟佳¹(), 蔡坤³, 盛晓晨¹, 乐军¹, 宋力昕¹^,²()

1.中国科学院上海硅酸盐研究所, 中国科学院特种无机涂层重点实验室, 上海 201899
2.上海科技大学物质科学与技术学院, 上海 201210
3.中国空间技术研究院北京控制工程研究所, 北京 100080

收稿日期:2021-01-18 修回日期:2021-02-25 出版日期:2021-11-20 网络出版日期:2021-03-15
通讯作者: 孟佳, 高级工程师. E-mail: jiameng@mail.sic.ac.cn;宋力昕, 研究员. E-mail: lxsong@mail.sic.ac.cn
作者简介:张亚晨(1995-), 女, 硕士研究生. E-mail: zhangych2@shanghaitech.edu.cn
基金资助:
北京控制工程研究所先进空间推进技术实验室和北京市高效能及绿色宇航推进工程技术研究中心开放基金(LabASP-2018-08)

Bending Failure Mechanism Study of Si-Cr-Ti High Temperature Oxidation Resistance Coating via Acoustic Emission Technique

ZHANG Yachen¹^,²(), MENG Jia¹(), CAI Kun³, SHENG Xiaochen¹, LE Jun¹, SONG Lixin¹^,²()

1. Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
2. School of Physical Science and Technology (SPST), ShanghaiTech University, Shanghai 201210, China
3. Beijing Institute of Control Engineering, China Academy of Space Technology, Beijing 100080, China

Received:2021-01-18 Revised:2021-02-25 Published:2021-11-20 Online:2021-03-15
Contact: MENG Jia, senior engineer. E-mail: jiameng@mail.sic.ac.cn;SONG Lixin, professor. E-mail: lxsong@mail.sic.ac.cn
About author:ZHANG Yachen (1995-), female, Master candidate. E-mail: zhangych2@shanghaitech.edu.cn
Supported by:
Advanced Space Propulsion Laboratory of BICE and Beijing Engineering Research Center of Efficient and Green Aerospace Pro-pulsion Technology(LabASP-2018-08)

摘要/Abstract

摘要：

本研究借助声发射技术对铌基高温抗氧化涂层在常温下的弯曲失效过程进行了研究。利用k均值聚类方法对信号进行了分类, 结合截面扫描电镜观测结果确定高温抗氧化涂层在弯曲载荷下的信号分别对应基体变形、表面垂直裂纹、滑动型界面裂纹和张开型界面裂纹, 通过快速傅里叶变换得到了各类信号的主频分别为100、310、590和450 kHz, 借助小波分析得到了各信号的小波能量系数。涂层弯曲失效过程主要包括四个阶段, 分别为受拉侧表面垂直裂纹萌生的初始损伤阶段、表面垂直裂纹增殖阶段、两侧界面裂纹快速扩展的损伤积累阶段和受压侧涂层明显剥落的宏观剥落阶段。

关键词: 声发射, k均值聚类分析, 失效机理, 高温抗氧化涂层

Abstract:

In this study, the bending failure process of niobium-based high-temperature oxidation resistance coatings at room temperature was investigated by the acoustic emission technique. The signals were classified by the k-mean clustering method. Based on the cross-sectional scanning electron microscopy observation results, the signals of the coatings under bending load were classfied to substrate deformation, surface vertical cracks, sliding interface cracks, and opening interface cracks. The frequency ranges of various types of signals and the wavelet energy coefficients were obtained by fast Fourier transform and wavelet analysis. The acoustic emission signal frequencies of substrate deformation, surface vertical crack, sliding interface crack, and opening interface crack are 100, 310, 590, and 450 kHz, respectively. The coating bending failure process mainly includes four stages, which are 1) the initial damage stage where vertical cracks sprout on the surface of the tensioned side, 2) the surface vertical crack proliferation stage, 3) the damage accumulation stage where the interface cracks on both sides expand rapidly, and 4) the macroscopic spalling stage where the coating on the stressed side is found to spall significantly.

Key words: acoustic emission, k-means cluster, failure mechanism, high temperature oxidation resistance coating

中图分类号:

TB35

张亚晨, 孟佳, 蔡坤, 盛晓晨, 乐军, 宋力昕. 基于声发射技术的Si-Cr-Ti高温抗氧化涂层弯曲失效机理研究[J]. 无机材料学报, 2021, 36(11): 1185-1192.

ZHANG Yachen, MENG Jia, CAI Kun, SHENG Xiaochen, LE Jun, SONG Lixin. Bending Failure Mechanism Study of Si-Cr-Ti High Temperature Oxidation Resistance Coating via Acoustic Emission Technique[J]. Journal of Inorganic Materials, 2021, 36(11): 1185-1192.

图/表 11

图1 弯曲实验所用试片示意图

Fig. 1 Schematic diagram of the bending specimen

图2 高温抗氧化涂层截面SEM照片

Fig. 2 SEM image of cross-section of high temperature oxidation resistance coating

图3 三点弯曲实验中应力-应变曲线和声发射事件数随时间变化的四个阶段

Fig. 3 Four stages of stress-strain curves and acoustic emission events with time in three-point bending experiments

图4 DBI随k值变化的计算结果

Fig. 4 Calculated results of DBI with change of k

图5 声发射信号聚类结果

Fig. 5 Clustering result of acoustic emission signal (a) Duration vs. RMS; (b) Counts vs. energy

图6 试片截面的SEM照片

Fig. 6 SEM images of specimen (a) Surface vertical cracks and interface cracks of the coating under tension; (b) Interface cracks of the coating under compression; (c) Surface vertical cracks of the coating under tension

图7 表面垂直裂纹(a)、基体变形(b)、张开型界面裂纹(c)和滑动型界面裂纹(d)的AE信号频谱

Fig. 7 Frequency spectra of the AE signal from (a) surface vertical cracks, (b) substrate deformation, (c) opening interface cracks, and (d) sliding interface cracks

图8 表面垂直裂纹(a)、基体变形(b)、张开型界面裂纹(c)和滑动型界面裂纹(d)的AE小波能量系数

Fig. 8 Wavelet energy spectra of the AE signal from (a) surface vertical cracks, (b) substrate deformation, (c) opening interface cracks, and (d) sliding interface cracks

图9 一组数据的线性拟合结果

Fig. 9 Linear fit results for a set of data

图10 四类信号的b值随时间变化的情况

Fig. 10 Evaluation of b value of 4 types AE signals with time

图11 高温抗氧化涂层失效机理示意图

Fig. 11 Schematic diagram of failure mechanism

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基于声发射技术的Si-Cr-Ti高温抗氧化涂层弯曲失效机理研究

Bending Failure Mechanism Study of Si-Cr-Ti High Temperature Oxidation Resistance Coating via Acoustic Emission Technique

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