表面技术
錶麵技術
표면기술
SURFACE TECHNOLOGY
2015年
6期
32-37
,共6页
杨忠须%刘贵民%徐军%郭永明
楊忠鬚%劉貴民%徐軍%郭永明
양충수%류귀민%서군%곽영명
Mo涂层%高速电弧喷涂%微观形貌%显微硬度%内聚强度%摩擦磨损
Mo塗層%高速電弧噴塗%微觀形貌%顯微硬度%內聚彊度%摩抆磨損
Mo도층%고속전호분도%미관형모%현미경도%내취강도%마찰마손
Mo coating%high velocity arc spraying%micro-structure%micro-hardness%cohesive strength%friction and wear
目的:初步研究高速电弧喷涂Mo涂层的综合性能,为进一步发展热喷涂Mo涂层制备工艺提供参考。方法利用高速电弧喷涂设备在45 CrNiMoVA钢表面制备Mo涂层,采用场发射扫描电镜、X射线能谱仪、显微硬度测试仪及电子万能试验机等对涂层形貌、成分、显微硬度及结合强度进行表征和测试,并结合断口微观形貌对拉伸断裂机理进行分析。采用CETR-3型多功能摩擦磨损试验机,在润滑条件下对涂层进行不同载荷的摩擦磨损实验,通过磨损体积及表面磨痕微观形貌分析涂层的摩擦磨损性能及机理。结果 Mo涂层具有一定量的微观孔隙,氧化物含量低,与基体结合牢固可靠,平均显微硬度高达416.3 HV0.1,平均内聚强度为22.7 MPa。拉伸断口呈脆性断裂,并伴有半熔融颗粒剥落留下的剥落坑。润滑条件下,涂层在10,30,50 N载荷下的磨损体积分别为1.1×107,4.4×107,5.5×107μm3。结论高速电弧喷涂可成功制备Mo涂层,涂层与基体为机械结合。在润滑条件下,涂层的磨损体积随载荷增大而增大,不同载荷下的磨损机理均以粘着磨损为主。
目的:初步研究高速電弧噴塗Mo塗層的綜閤性能,為進一步髮展熱噴塗Mo塗層製備工藝提供參攷。方法利用高速電弧噴塗設備在45 CrNiMoVA鋼錶麵製備Mo塗層,採用場髮射掃描電鏡、X射線能譜儀、顯微硬度測試儀及電子萬能試驗機等對塗層形貌、成分、顯微硬度及結閤彊度進行錶徵和測試,併結閤斷口微觀形貌對拉伸斷裂機理進行分析。採用CETR-3型多功能摩抆磨損試驗機,在潤滑條件下對塗層進行不同載荷的摩抆磨損實驗,通過磨損體積及錶麵磨痕微觀形貌分析塗層的摩抆磨損性能及機理。結果 Mo塗層具有一定量的微觀孔隙,氧化物含量低,與基體結閤牢固可靠,平均顯微硬度高達416.3 HV0.1,平均內聚彊度為22.7 MPa。拉伸斷口呈脆性斷裂,併伴有半鎔融顆粒剝落留下的剝落坑。潤滑條件下,塗層在10,30,50 N載荷下的磨損體積分彆為1.1×107,4.4×107,5.5×107μm3。結論高速電弧噴塗可成功製備Mo塗層,塗層與基體為機械結閤。在潤滑條件下,塗層的磨損體積隨載荷增大而增大,不同載荷下的磨損機理均以粘著磨損為主。
목적:초보연구고속전호분도Mo도층적종합성능,위진일보발전열분도Mo도층제비공예제공삼고。방법이용고속전호분도설비재45 CrNiMoVA강표면제비Mo도층,채용장발사소묘전경、X사선능보의、현미경도측시의급전자만능시험궤등대도층형모、성분、현미경도급결합강도진행표정화측시,병결합단구미관형모대랍신단렬궤리진행분석。채용CETR-3형다공능마찰마손시험궤,재윤활조건하대도층진행불동재하적마찰마손실험,통과마손체적급표면마흔미관형모분석도층적마찰마손성능급궤리。결과 Mo도층구유일정량적미관공극,양화물함량저,여기체결합뢰고가고,평균현미경도고체416.3 HV0.1,평균내취강도위22.7 MPa。랍신단구정취성단렬,병반유반용융과립박락류하적박락갱。윤활조건하,도층재10,30,50 N재하하적마손체적분별위1.1×107,4.4×107,5.5×107μm3。결론고속전호분도가성공제비Mo도층,도층여기체위궤계결합。재윤활조건하,도층적마손체적수재하증대이증대,불동재하하적마손궤리균이점착마손위주。
ABSTRACT:Objective To study the comprehensive properties of Mo coating prepared by high velocity arc spraying, so as to pro-vide some referential value for Mo coating preparation technology. Methods The Mo coatings were prepared on the surface of 45CrNiMoVA steel by the high velocity arc spraying device, tests include microstructure, components, microhardness, bonding-strength were performed by SEM, XRD, micro-hardness test, electromechanical universal testing machine, and the fracture mecha-nism was analyzed through the micro-structure of fracture surface. The lubricative tribological properties under different loads of coating were tested by the CETR-3 multifunctional friction and wear testing machine. The friction properties and wear mechanism were characterized through the wear volume and worn surface. Results The Mo coating presented a certain amount of micro-pores and low content of oxides, the bonding of coating and matrix is reliable without cracks and pores, the average microhardness is 416. 3 HV0. 1, the average cohesive strength is 22. 7 MPa. The tensile fracture surface showed brittle fracture companied with some pits resulted by partial melted particles, and the wear volume were 1. 1×107μm3, 4. 4×107μm3 and 5. 5×107μm3 when under the load of 10 N, 30N and 50 N, respectively. Conclusion Mo coating can be successfully prepared by high velocity arc spraying, the bonding mechanism of coating and matrix is mechanical joint. The lubricative wear test showed that wear volume was increased with the rise of load, and the wear mechanism under different loadings was mainly adhesive wear.