NiCrWRe喷熔层组织和耐磨特性  

Microstructure and wear-resistance property of NiCrWRe alloy sprayed coating

作　　者：张振宇[1] 王智平[2] 梁补女[1] 

机构地区：[1]兰州工业高等专科学校机械工程系,兰州730050 [2]兰州理工大学有色金属新材料国家重点实验室,兰州730050

出　　处：《焊接学报》2007年第9期25-28,共4页Transactions of The China Welding Institution

基　　金：甘肃省自然基金资助项目(ZS031-A25-018G)

摘　　要：采用火焰喷熔方法在45钢表面制取了NiCrWRe喷熔层,并与NiCrW合金喷熔层进行耐磨对比试验。利用XRD分析了喷熔层的相结构,用SEM和EDS等技术分析了喷熔层的表面、截面及磨损面形貌,测定了与基体的结合力。结果表明,NiCrWRe喷熔层组织均匀细化。稀土元素促进了喷熔层和基体之间原子的扩散,NiCrWRe喷熔层与基体45号钢形成了牢固的冶金结合,提高了喷熔层结合强度。同时还含有较高比例的硬质相;稀土的加入使喷熔层的耐磨性显著提高,在给定的试验条件下,NiCrWRe涂层的耐磨性明显高于NiCrW。The NiCrWRe sprayed coating was prepared on the surface of 45 carbon steel by using flame spraying.The sprayed coating was characterized by abrasive wear resistance test,and compared with the NiCrW alloy coating.Scanning electron microscope,energy dispersion spectroscope and X-ray diffraction were employed to analyze the morphologies of the coatings,as well as their phase structures.The bonding strength of coating/substrate interface was tested by means of tensile strength.The results showed that the coating is firmly adhered to substrate,and contains the hard phase with higher proportion.Adding rare earth element can obviously increase the wear resistance of the coatings.In the given conditions,the wear resistance of NiCrWRe coating is much higher than that of NiCrW alloy coating.

关 键 词：稀土 喷熔层 磨粒磨损 耐磨性 

分 类 号：TG174.442[金属学及工艺—金属表面处理]