等离子熔覆Ni基耐磨涂层制备及摩擦学性能
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摘要
以商用WF260合金粉末为原料,采用等离子熔覆技术在20钢表面制备镍(Ni)基耐磨涂层。在室温干摩擦条件下,采用MM-200型摩擦磨损试验机测试涂层的摩擦磨损性能。采用扫描电镜(SEM)、能谱仪(EDS)及X射线衍射仪(XRD)等对涂层的微观结构和组织成分进行了表征。研究结果表明:所制涂层呈层片状分布,与基体的冶金结合良好,表面存在孔隙现象。组织中存在大量的树枝晶,等离子熔覆层中主要物相为γ-(Ni,Fe)、(Fe,Cr,Ni)mCn、Cr_2Ni_3、BPO_4及Fe_5C_2。20钢的磨损率为1. 90 mm~3/min,涂层的磨损率为0. 26 mm~3/min,大幅改善了基体的耐磨性。涂层的磨损机制为磨粒磨损以及氧化磨损,其主要强化机制为弥散强化和固溶强化。
The Ni based wear-resistant coating was prepared by plasma cladding technology on the surface of 20 steel by using the commercial WF260 alloy powders. The friction and wear behavior of the coating under dry friction condition at room temperature were investigated by the MM-200 tribo-tester. The microstructure and phase composition of the coating were observed by scanning electron microscope( SEM),energy dispersive spectrometer( EDS) and X-ray diffractometer( XRD). The results indicate that the coating exhibites a lamellar structure and has a good metallurgically bond with the matrix. Some pores exist on the surface of the coating and a large amount of the dendrites are also found in the coating. The coating mainly consists of γ-( Ni,Fe),( Fe,Cr,Ni)mCn,Cr_2Ni_3,BPO_4 and Fe_5C_2 phases. The wear rate of the 20 steel and the coating are 1. 90 mm~3/min and 0. 26 mm~3/min respectively. The wear resistance of the 20 steel is greatly improved by the coating. The main wear mechanisms of the coating are abrasive wear and oxidation wear,and the main strengthening mechanisms are dispersion strengthening and solution strengthening.
The Ni based wear-resistant coating was prepared by plasma cladding technology on the surface of 20 steel by using the commercial WF260 alloy powders. The friction and wear behavior of the coating under dry friction condition at room temperature were investigated by the MM-200 tribo-tester. The microstructure and phase composition of the coating were observed by scanning electron microscope( SEM),energy dispersive spectrometer( EDS) and X-ray diffractometer( XRD). The results indicate that the coating exhibites a lamellar structure and has a good metallurgically bond with the matrix. Some pores exist on the surface of the coating and a large amount of the dendrites are also found in the coating. The coating mainly consists of γ-( Ni,Fe),( Fe,Cr,Ni)mCn,Cr_2Ni_3,BPO_4 and Fe_5C_2 phases. The wear rate of the 20 steel and the coating are 1. 90 mm~3/min and 0. 26 mm~3/min respectively. The wear resistance of the 20 steel is greatly improved by the coating. The main wear mechanisms of the coating are abrasive wear and oxidation wear,and the main strengthening mechanisms are dispersion strengthening and solution strengthening.
引文
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[4]严大考,张洁溪,唐明奇,等.等离子熔覆技术的研究进展[J].热加工工艺,2015,44(4):20-24.
[5]宗琳,菅渡平,张小玲,等. Q245钢表面等离子堆焊Fe-Cr-Ti-C层的组织与耐磨性能[J].材料保护,2015,48(3):54-56.
[6]赵运才,刘洋.等离子喷涂Ni60A/MoS2复合润滑涂层摩擦学特性研究[J].河南科技大学学报(自然科学版),2008,29(5):1-4.
[7]黄思语,王水波.感应熔覆制备镍基合金涂层的研究进展[J].表面技术,2017,46(9):39-47.
[8]彭竹琴,王红芳,卢金斌,等. 316L不锈钢等离子熔覆Ni基合金涂层的组织与性能[J].焊接学报,2011,32(3):89-92.
[9] XIE G Z,SONG X L,ZHANG D J,et al. Microstructure and corrosion properties of thick WC composite coating formed by plasma cladding[J]. Applied surface science,2010,256(21):6354-6358.
[10]刘均波,王朋,李惠琪,等.反应等离子熔覆Fe-Cr-Ti-C涂层的组织与性能[J].焊接学报,2013,34(6):61-64.
[11]蔡乾锋,朱世东,李金灵,等. 20钢在模拟CO2驱工况环境中的腐蚀行为[J].腐蚀与防护,2016,37(8):653-656.
[12]叶宏,喻文新,雷临萍,等. H13钢表面激光熔覆Ni基涂层的组织与耐磨性能[J].特种铸造及有色合金,2016,36(7):690-693.
[13] PALANIVELU R,RUBAN K A. Scratch and wear benaviour of plasma sprayed nano ceramics bilayer Al2O3-13%Ti O2/hydroxyapatite coated on medical grade titanium substrates in SBF environment[J]. Applied surface science,2014,315(4):372-379.
[14]崔忠圻,覃耀春.金属学与热处理[M].北京:机械工业出版社,2007.
[15]姜祎,徐滨士,王海斗,等.热喷涂层残余应力的来源及其失效形式[J].金属热处理,2007,32(1):25-27.
[16]赵雪阳,刘英,夏一龙,等. H13钢激光熔覆Ti C/Ni合金复合涂层的组织与耐磨性[J].材料热处理学报,2016,37(4):190-196.
[17]曹玉霞,杜令忠,张伟刚,等.等离子喷涂Ni Co Cr Al Y/Al2O3涂层的制备及摩擦性能研究[J].表面技术,2015,44(5):62-66.