C-MoS_2-Fe_2O_3(Fe_3O_4)纳米润滑剂对无镀铜焊丝导电嘴磨损的影响
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摘要
针对无镀铜实心焊丝在机器人自动焊接时导电嘴磨损问题,采用机械涂敷法在无镀铜实心焊丝表面制备了C-MoS_2-Fe_2O_3(Fe_3O_4)纳米复合润滑剂,研究了润滑剂配比对导电嘴磨损性能的影响.结果表明,C-Fe_3O_4涂层的润滑性能优于C-Fe_2O_3涂层的润滑性能,随着涂层中纳米MoS_2含量的升高,导电嘴的抗磨性能增强.纳米复合润滑剂在焊丝与导电嘴的摩擦界面发生摩擦化学反应形成了保护性的自修复膜,此膜主要由润滑性能优异的FeO,MoS_2,MoO_3组成,避免了焊丝与导电嘴内表面的直接接触,从而减少了导电嘴的磨损.氧化磨损、磨粒磨损和电弧烧蚀是导电嘴磨损的主要机制.
Aiming at the application of contact tip wear of non-copper coated solid wires in robot auto-welding, CMoS_2-Fe_2O_3(Fe_3O_4) nano-composite lubricants were prepared on the surfaces of non-copper coated solid wires by a mechanical coating technique. The effects of C-MoS_2-Fe_2O_3(Fe_3O_4) lubricants proportion on the contact tip wear were investigated. The results demonstrate that lubricating property of C-Fe_3O_4 coatings outperformed lubricating property of C-Fe_2O_3 coatings. The anti-wear performance of the contact tip was enhanced with an addition of nano-MoS_2.The formation of protective self-repairing films at the rubbing interface of welding wires against the contact tip was attributed to the tribochemical reaction among lubricants. The tribofilm composition were FeO, MoS_2 and MoO_3 which lubricating properties are excellent. They can avoid direct contact of welding wires against the contact tip, thus the contact tip wear was inereasdel. Oxidative wear, abrasive wear and arc ablation were the primary mechanisms of the contact tip wear.
Aiming at the application of contact tip wear of non-copper coated solid wires in robot auto-welding, CMoS_2-Fe_2O_3(Fe_3O_4) nano-composite lubricants were prepared on the surfaces of non-copper coated solid wires by a mechanical coating technique. The effects of C-MoS_2-Fe_2O_3(Fe_3O_4) lubricants proportion on the contact tip wear were investigated. The results demonstrate that lubricating property of C-Fe_3O_4 coatings outperformed lubricating property of C-Fe_2O_3 coatings. The anti-wear performance of the contact tip was enhanced with an addition of nano-MoS_2.The formation of protective self-repairing films at the rubbing interface of welding wires against the contact tip was attributed to the tribochemical reaction among lubricants. The tribofilm composition were FeO, MoS_2 and MoO_3 which lubricating properties are excellent. They can avoid direct contact of welding wires against the contact tip, thus the contact tip wear was inereasdel. Oxidative wear, abrasive wear and arc ablation were the primary mechanisms of the contact tip wear.
引文
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[2]Zhang H W,Su J H,Chen J.Status and development trend of the welding consumables industry in China[J].China Welding,2017,26(2):23-31.
[3]Scharf T W,Prasad S V.Solid lubricants:a review[J].Journal of Materials Science,2013,48(2):511-531.
[4]Zhou Y,Wang S Q,Huang K Z,et al.Improvement of tribological performance of TC11 alloy via formation of a double-layer tribo-layer containing graphene/Fe2O3 nanocomposite[J].Tribology International,2017,109(1):485-495.
[5]Ji Y Y,Bao J S,Tuttle M E,et al.Influence of magnetic powders on the tribological performance of a novel magnetic brake material[J].Composite Interfaces,2017,24(4):399-415.
[6]曹晓涛.表面处理对无镀铜焊丝导电嘴磨损及抗锈性影响的研究[D].北京:北京工业大学,2017.
[7]栗卓新,万千,张天理,等.纳米改性涂层及焊接工艺参数对无镀铜实心焊丝导电嘴磨损影响的研究进展[J].材料工程,2017,45(12):135-146.Li Zhuoxin,Wan Qian,Zhang Tianli,et al.Progress in effect of nano-modified coatings and welding process parameters on wear of contact tube for non-copper coated solid wires[J].Journal of Materials Engineering,2017,45(12):135-146.
[8]栗卓新,曹晓涛,Wolfgang Tillmann.纳米材料在无镀铜焊丝中的研究现状[J].北京工业大学学报,2017,43(10):1582-1589.Li Zhuoxin,Cao Xiaotao,Wolfgang Tillmann.Progress of nanomaterials in non-copper coated solid wires[J].Journal of Beijing University of Technology,2017,43(10):1582-1589.
[9]Dai W,Kheireddin B,Gao H,et al.Roles of nanoparticles in oil lubrication[J].Tribology International,2016,102(5):88-98.
[10]Shimizu H,Yokota Y,Mizuno M,et al.Wear mechanism in contact tube[J].Science and Technology of Welding and Joining,2006,11(1):94-105.
[11]Hernandez S,Hardell J,Courbon C,et al.High temperature friction and wear mechanism map for tool steel and boron steel tribopair[J].Tribology-Materials,Surfaces&Interfaces,2014,8(2):74-84.
[12]Aouadi S M,Gao H,Martini A,et al.Lubricious oxide coatings for extreme temperature applications:A review[J].Surface&Coating Technology,2014,257(5):266-277.
[13]Zhou H,Zhang Y P,Hua X H,et al.Al2O3/Mo composite and its tribological behavior against AISI201 stainless steel at elevated temperatures[J].International Journal of Refractory Metals and Hard Materials,2014,43(12):263-268.
[14]Xie G X,Guo D,Luo J B.Lubrication under charged conditions[J].Tribology International,2015,84(11):22-35.