大气等离子和超音速火焰喷涂CoCrAlYSi-hBN涂层组织和性能对比  

Comparison of the Microstructure and Properties of CoCrAlYSi-hBN Coatings Prepared by APS and HVOF Process

作　　者：张昂 王长亮 王天颖 郭孟秋 崔永静 田浩亮 ZHANG Ang;WANG Chang-liang;WANG Tian-ying;GUO Meng-qiu;CUI Yong-jing;TIAN Hao-liang(Key Laboratory of Advanced Corrosion and Protection for Aviation Materials,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院航空材料先进腐蚀与防护重点实验室,北京100095

出　　处：《装备环境工程》2021年第6期51-58,共8页Equipment Environmental Engineering

基　　金：国家科技重大专项(2017-VII-0013-0110)。

摘　　要：目的针对航空发动机叶片榫头/榫槽摩擦副工作中的微动磨损问题,开展CoCrAlYSi-hBN抗微动磨损涂层研究。方法通过大气等离子(APS)和超音速火焰(HVOF)喷涂工艺,制备CoCrAlYSi-hBN涂层,采用扫描电镜(SEM)研究涂层的形貌和微观组织,采用显微硬度计和拉伸试验机测试涂层的显微硬度和结合强度,采用SRV试验机探究涂层的摩擦磨损性能。结果APS喷涂CoCrAlYSi-hBN涂层熔化更充分,显微组织均匀,具有更多高含量的hBN和孔隙;HVOF喷涂CoCrAlYSi-hBN涂层显微组织具有明显的层状结构,涂层致密,hBN和孔隙含量少;APS喷涂CoCrAlYSi-hBN涂层的硬度平均值为168.4HV_(0.3),结合强度平均值为44.6 MPa,远小于HVOF喷涂CoCrAlYSi-hBN涂层的硬度(327.1HV0.3)和结合强度平均值(59.5 MPa)。相比HVOF喷涂CoCrAlYSi-hBN涂层,APS喷涂CoCrAlYSi-hBN涂层虽然有更低的摩擦系数(0.75),但涂层磨损更严重,涂层磨痕表面有明显的涂层剥落,HVOF喷涂CoCrAlYSi-hBN涂层磨痕则出现更多的犁沟。结论HVOF喷涂工艺制备的CoCrAlYSi-hBN涂层的综合性能优于APS喷涂CoCrAlYSi-hBN涂层,在摩擦过程中,两种工艺制备的CoCrAlYSi-hBN涂层都会转移到对偶件上,从而减少对偶件的磨损,有作为叶片榫头抗微动磨损涂层的潜力。To eliminate the fretting wear in a dovetail attachment of a compress blade to a disc,CoCrAlYSi-hBN coatings are fabricated by the atmosphere plasma spray(APS)and high-velocity oxygen fuel(HVOF)spraying process.The microstruc-ture,hardness,bonding strength and wear property are studyed by using scanning electron microscopy(SEM),microhardness tester,adhesive strength measuring and SRV fretting friction wear tester.The coating prepared by APS had a uniformal micro-structure with higher content of hBN and pore.However,the coatings prepared by HVOF have a lamellar and dense microstructure with low content of hBN and pore.The hardness and bonding strength of coating prepared by APS is lower than that of coating prepared by HVOF.Although the friction coefficients of coating fabricated by APS is lower than that of coating prepared by HVOF,the coatings prepared by HVOF present a better wear resistance than that prepared by APS.The worn surface of Co-CrAlYSi-hBN coatings prepared by APS shows apparent spalling and a little indentation.While the worn surface CoCrA-lYSi-hBN coatings prepared by HVOF shows apparent spalling.CoCrAlYSi-hBN coatings have the potential to be used on compressor blades.

关 键 词：等离子喷涂 超音速火焰喷涂 CoCrAlYSi-hBN涂层 显微组织 抗微动磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]