超音速等离子喷涂Mo-W涂层的力学性能  

Mechanical Properties of Mo-W Coatings Prepared by Supersonic Plasma Spraying

作　　者：闫涛[1,2] 刘贵民[2] 吴行[3] 朱硕[2] 刘明[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 [2]装甲兵工程学院装备维修与再制造工程系,北京100072 [3]北京特种车辆研究所,北京100072

出　　处：《中国表面工程》2017年第1期107-114,共8页China Surface Engineering

基　　金：北京市自然科学基金(2152031)~~

摘　　要：采用超音速等离子喷涂技术在45CrNiMoVA钢表面制备了Mo-W合金涂层,利用场发射扫描显微镜(SEM)、电子能谱仪(EDS)、维氏显微硬度计分析测试了涂层组织、硬度,利用球-盘式摩擦磨损试验机研究了磨损载荷及频率对Mo-W合金涂层摩擦学性能的影响。结果表明:质量比为3:1的Mo、W机械混合粉喷涂后涂层中Mo、W元素质量比接近3:1。涂层组织致密,与基体结合为机械结合,表面平均显微硬度为563.2 HV0.1。Mo-W涂层的显微硬度、耐磨性和减摩性比基体45CrNiMoVA钢有所提高,且载荷越大,涂层的耐磨性和减摩性优势越明显。Mo-W涂层与Si3N4陶瓷的摩擦磨损机制以磨料磨损和氧化磨损为主。当磨损载荷变大和磨损频率变高时,疲劳剥落磨损表现明显。Mo-W coating was prepared on 45CrNiMoVA steel by supersonic plasma spraying technology. The microstructure, chemical composition and micro hardness were investigated with scanning electron microscope （SEM）, energy dispersive spectrometer （EDS） and Vickers micro hardness tester, respectively. The effect of load and frequency on the tribological behaviors of the coating was studied using a ball-on-disc tribometer. The results show that the coating prepared with the mixtured powders of Mo-W mass ratio is approximately 3：1. The coating is dense and mechanically bonds to the substrate. The average surface micro hardness is 563.2 HV0.1, higher than that of the substrate and Mo coating. Both the abrasion resistance and anti-friction performance of the coating are better than the substrate, which is more obvious with the higher abrasion load. The main frictional wear mechanism between the coating and Si3N4 are grinding abrasion and oxidative wear, while fatigue wear also plays an important role in the abrasion mechanism with the higher abrasion load and frequency.

关 键 词：Mo-W涂层 超音速等离子喷涂 力学性能 

分 类 号：TG174.442[金属学及工艺—金属表面处理] TG113.25[金属学及工艺—金属学]