不同方法制备NiCrBSi涂层的结构与摩擦学性能  

Microstructure and Tribological Properties of NiCrBSi Coatings Prepared by Different Methods

作　　者：张梦清 张伟[1] 于鹤龙[1] 张攀[1] 

机构地区：[1]装甲兵工程学院再制造技术重点实验室,北京100072

出　　处：《中国表面工程》2014年第6期75-81,共7页China Surface Engineering

基　　金：国家科技支撑计划(2011BAC10B05)

摘　　要：采用氧-乙炔火焰喷涂、高频感应重熔和高频感应熔覆技术分别在45钢基体上制备3种NiCrBSi涂层。利用金相显微镜、场发射扫描电镜(SEM)、X射线衍射仪(XRD)和显微硬度计等测试了涂层的显微组织及性能;采用CETR摩擦磨损试验机考察了3种涂层在干摩擦条件下的滑动磨损性能。结果表明:火焰喷涂层与基体间的结合为机械结合,其内部以γ-Ni为主,硬质相较少,涂层孔隙率高;经过感应重熔处理之后,涂层与基体间结合方式由机械结合变为冶金结合,涂层内硬质相含量增加,孔隙率降低。高频感应重熔层与高频感应熔覆层物相相似,主要由γ-Ni、Cr7C3、Cr23C6和CrB等组成,涂层与基体呈良好的冶金结合,硬质相分布均匀。感应重熔层与感应熔覆层耐磨性相当,均优于普通火焰喷涂层。NiCrBSi coatings were prepared by oxygen-acetylene flame spraying,high frequency induction remelting（HFIR）and high frequency induction cladding（HFIC）on 45 steel substrate.The microstructures and phase structure of the coatings were analyzed using metallographic microscope,scanning electron microscopy（SEM）and X-ray diffractometry（XRD）,respectively.The hardness distribution of NiCrBSi coatings were measured by microhardness test.The tribological properties of the coatings were investigated by a ball-on-disc tribometer under dry sliding wear test condition.The bonding-strength of three different coatings was tested by high load scratch-test machine.The results show that the main phase of the flame spraying coating isγ-Ni,the coating has less rigid material and high objection rate.The spraying coating is turned into more rigid material and low objection rate after the HFIR processing,combination between the coating and the matrix has changed from machanical into metallurgical.The main phases of the HFIR and HFIC coatings induceγ-Ni,Cr7C3,Cr23C6,CrB,et al.Both of the two coatings were fully metallurgically combined and have an even distribution of rigid materials.Tribological property of the HFIR coatings is close to HFIC coatings,and both are better than that of flame spraying coatings.

关 键 词：火焰喷涂 感应重熔 感应熔覆 NICRBSI 摩擦学性能 

分 类 号：TG174.442[金属学及工艺—金属表面处理] TG115.58[金属学及工艺—金属学]