等离子喷涂铁基涂层疲劳磨损裂纹捕捉技术研究  

Investigation of Capturing Technique for Fatigue Crack of Plasma Sprayed Fe-based Coating

作　　者：朴钟宇[1] 赵朦朦 徐滨士[2] 王海斗[2] 文东辉[1] 

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310012 [2]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100089

出　　处：《兵工学报》2016年第1期109-113,共5页Acta Armamentarii

基　　金：国家自然科学基金项目(51125023;51305397;51375457);浙江省科技厅公益性项目(2014C31099);浙江大学流体动力与机电系统国家重点实验室开放基金项目(GZKF-201411);浙江工业大学特种装备制造与先进加工技术教育部重点实验室开放基金项目(EM2015042003)

摘　　要：采用等离子喷涂制备了铁基涂层,使用声发射技术对涂层的疲劳磨损实验进行在线监测,捕捉裂纹动态信息,总结典型的声发射信号反馈类型,通过渗透探伤的方式对涂层表面微损伤区域进行表征,并采用聚焦离子束扫描电子显微镜(FIB-SEM)技术对涂层的微损伤区域进行亚表层分析探索失效机理。结果表明:涂层疲劳磨损过程中声发射信号反馈分为3个阶段,即磨合期、稳定期和突变期;结合渗透探伤技术可以有效锁定涂层表面微损伤区域,验证声发射信号反馈的准确性,可见通过声发射在线监测技术可以准确地捕捉涂层内部的开裂;FIB-SEM分析表明涂层疲劳磨损失效的起源是近表层微缺陷。Fe-based coatings are deposited by plasma spraying technique. The fatigue wear experiments of the coatings are on-line monitored to capture the dynamic information of the cracks by using acoustic emission （AE） technique. The typical signal model is summarized. The micro-damages on the coating surface are characterized by oil whiting test. The micro-damages on the coating surface are analyzed by FIB-SEM, and its failure mechanism is investigated. Results show that the AE signal model during the fa- tigue wear process is divided into 3 stages, namely run-in period, stable period, and mutation period. Penetrating test technique is introduced to confirm the micro-damages on the coating surface. The reliability of AE monitoring can also be proved. The results show that the fractures in the coating can be accurately captured by AE signals. The micro-defects are considered to be the origins of coating failure based on the results of FIB-SEM analysis.

关 键 词：材料表面与界面 等离子喷涂 铁基涂层 疲劳磨损 声发射 裂纹捕捉 

分 类 号：TH117[机械工程—机械设计及理论]