激光熔覆原位自生TiC-Cr_xS_y/Ni基复合涂层的组织与性能
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摘要
采用激光熔覆技术在Ti6Al4V合金表面制备出原位自生Ti C-CrxSy/Ni基复合涂层,利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和能谱仪(EDS)分析了不同Ni包Mo S2含量对涂层物相组成、显微组织的影响,并测试了涂层的硬度及摩擦磨损性能。结果表明,在激光熔覆过程中Ni包Mo S2发生了分解反应,分解后的S大部分生成了新的润滑相CrxSy、Ti S。随着Ni包Mo S2含量的增加,复合涂层凝固组织逐渐细化,树枝相、多边块状相逐渐减少,球状相、条状相逐渐增多。由于上述组织的变化,涂层的显微硬度先增大后减小,摩擦因数逐渐减小。当Ni包Mo S2含量为40%时,涂层的显微硬度为1048 HV0.3,摩擦因数为0.19,磨损机理表现为轻微犁削,此时涂层的耐磨性能最优。
The in-situ TiC-CrxSy/ Ni based composite coating was prepared on the surface of Ti6Al4 V alloy by laser cladding technology. The effect of Ni package of MoS 2content on phase composition,microstructure,microhardness,friction and wear properties of the coating was investigated by means of X-ray diffraction( XRD),scanning electron microscopy( SEM) and energy dispersive spectroscopy( EDS). The results show that in the process of laser cladding,Ni package MoS 2is decomposed and the decomposed S is mostly generated the new lubricating phase CrxSyand TiS. With the increase of Ni package of MoS 2content,the microstructure of the coating refines,dendrite and bulk phase decrease gradually,spherical phase and the strip phase increase. Due to the transition of the microstructure,the microhardness of the coating increases firstly and then decreases,while the friction coefficient decreases gradually. When the Ni package MoS 2content reaches40%,microhardness of the coating is 1048 HV0. 3,the friction coefficient is 0. 19 and the wear mechanism looks somewhat plough cut,and the wear resistance of the composite coating is the best.
The in-situ TiC-CrxSy/ Ni based composite coating was prepared on the surface of Ti6Al4 V alloy by laser cladding technology. The effect of Ni package of MoS 2content on phase composition,microstructure,microhardness,friction and wear properties of the coating was investigated by means of X-ray diffraction( XRD),scanning electron microscopy( SEM) and energy dispersive spectroscopy( EDS). The results show that in the process of laser cladding,Ni package MoS 2is decomposed and the decomposed S is mostly generated the new lubricating phase CrxSyand TiS. With the increase of Ni package of MoS 2content,the microstructure of the coating refines,dendrite and bulk phase decrease gradually,spherical phase and the strip phase increase. Due to the transition of the microstructure,the microhardness of the coating increases firstly and then decreases,while the friction coefficient decreases gradually. When the Ni package MoS 2content reaches40%,microhardness of the coating is 1048 HV0. 3,the friction coefficient is 0. 19 and the wear mechanism looks somewhat plough cut,and the wear resistance of the composite coating is the best.
引文
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[3]Wang Minmin,Lu Weijie,Qin Jining,et al.Effect of volume fraction of reinforcement on room temperature tensile property of in situ(Ti B+Ti C)/Ti matrix composites[J].Materials and Design,2006,27(6):494-498.
[4]翟玉峰,王新洪,黄坚.激光熔覆Ti C-Mo2C颗粒增强Fe基涂层的组织与性能[J].中国激光,2009,36(12):3287-3292.Zhai Yufeng,Wang Xinhong,Huang Jian.Microstructure and properties of Ti C-Mo2C particles reinforced Fe-based composite coatings produced by laser cladding[J].Chinese Journal of Lasers,2009,36(12):3287-3292.
[5]Liu Xiubo,Meng Xiangjun,Liu Haiqing,et al.Development and characterization of laser clad high temperature self-lubricating wear resistant composite coatings on Ti-6Al-4V alloy[J].Materials and Design,2014,55:404-409.
[6]刘秀波,刘海青,孟祥军,等.激光熔覆Ni Cr/Cr3C2-WS2自润滑耐磨涂层的高温摩擦学行为[J].材料工程,2013(11):26-31.Liu Xiubo,Liu Haiqing,Meng Xiangjun,et al.High temperature tribological behaviors of laser cladding Ni Cr/Cr3C2-WS2self-lubrication wear-resistant coating[J].Journal of Materials Engineering,2013(11):26-31.
[7]黄传兵,杜令忠,张伟刚.Ni Cr/Cr3C2-Ba F2·Ca F2高温自润滑耐磨涂层的制备与摩擦磨损特性[J].摩擦学学报,2009,29(1):68-74.Huang Chuanbing,Du Lingzhong,Zhang Weigang.Preparation and tribological properties of Ni Cr/Cr3C2-Ba F2-Ca F2high temperature selflubricating wear-resistant coating[J].Tribology,2009,29(1):68-74.
[8]Li Jun,Zhang Huiying,Li Wenge,et al.Microstructure and properties of in situ synthesized Ti B2+WC reinforced composite coatings[J].Rare Metals,2008,27(5):451-456.
[9]刘丹,陈志勇,陈科培,等.TC4钛合金表面激光熔覆复合涂层的组织和耐磨性[J].金属热处理,2015,40(3):58-62.Liu Dan,Chen Zhiyong,Chen Kepei,et al.Microstructure and wear resistance of laser clad composite coating on TC4titanium alloy surface[J].Heat Treatment of Metals,2015,40(3):58-62.
[10]Wang Yanfang,Lu Qinglong,Xiao Lijun,et al.Laser cladding FeCr-Si-P amorphous coatings on 304L stainless[J].Rare Metals,2014,43(2):274-277.
[11]张蕾,陈华辉,赵会友,等.Ce O2对WC-Co/Ni60B激光熔覆涂层组织和磨损性能的影响[J].摩擦学学报,2008,28(6):485-490.Zhang Lei,Chen Huahui,Zhao Huiyou,et al.Effects of Ce O2on structure and wear resistance of laser cladding WC-Co/Ni60B coatings[J].Tribology,2008,28(6):485-490.
[12]翟长生,巫瑞智,王海军,等.HEPJet等离子喷涂Al2O3性能试验研究[J].材料工程,2004(12):47-50.Zhai Changsheng,Wu Ruizhi,Wang Haijun,et al.Properties of Al2O3coatings by HEPJet plasma spray method[J].Journal of Materials Engineering,2004(12):47-50.
[13]孙荣禄,牛伟,雷贻文,等.激光熔覆原位自生CrxSy/Ni基复合涂层的微观组织和摩擦磨损性能[J].中国激光,2013,40(10):108-113.Sun Ronglu,Niu Wei,Lei Yiwen,et al.Microstructure and frictional wear properties of laser clad in situ CrxSy/Ni composite coating[J].Chinese Journal of Lasers,2013,40(10):108-113.
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