摘要
目的以MoS_(2)/Ti_(3)C_(2)T_(x)为固体润滑剂,在25(室温)~400℃下制备具有优异摩擦学性能的MoS_(2)/Ti_(3)C_(2)T_(x)磷酸盐涂层,并研究它在不同温度下的减摩抗磨机制。方法以氢氟酸为MAX相(Ti_(3)AlC_(2))粉体的蚀刻剂,制备具有“手风琴”形貌的Ti3C2TxMXene。以硫脲、钼酸铵、MXene为原料,制备MoS_(2)/Ti_(3)C_(2)T_(x)复合材料。以Al(H2PO4)3为黏结剂,以Cu O为固化剂,分别以Ti_(3)C_(2)T_(x)和MoS_(2)/Ti_(3)C_(2)T_(x)为固体润滑剂,制备Ti3C2Tx磷酸盐涂层和MoS_(2)/Ti_(3)C_(2)T_(x)磷酸盐涂层。通过高温摩擦磨损试验机和光学数码显微镜测试涂层在25~400℃时的摩擦因数和磨损率,采用扫描电子显微镜和显微共焦激光拉曼光谱仪分析磨痕表面形貌、物相,进而探讨磨损机理。结果当Ti_(3)C_(2)T_(x)与Al(H_(2)PO_(4))_(3)的质量比为2∶1时,Ti3C2Tx磷酸盐涂层在室温(25℃)下的摩擦因数和磨损率均最低,分别为0.38和2.75×10-4mm3/(N·m)。在Ti_(3)C_(2)T_(x)表面负载MoS2,将MoS_(2)/Ti_(3)C_(2)T_(x)作为固体润滑剂,能够显著降低磷酸盐涂层在25~400℃下的摩擦因数,同时磨损率也有所降低。MoS_(2)/Ti_(3)C_(2)T_(x)磷酸盐涂层在室温下的摩擦因数低至0.11,相较于Ti3C2Tx磷酸盐涂层降低了71.1%,其磨损率相较于Ti3C2Tx磷酸盐涂层降低了1个数量级。在25~400℃范围内,MoS_(2)/Ti_(3)C_(2)T_(x)磷酸盐涂层的摩擦因数均低于0.21。随着温度的升高,摩擦因数呈先减小后增大的趋势,磨损率整体上呈增大趋势。结论相较于Ti_(3)C_(2)T_(x)磷酸盐涂层,MoS_(2)/Ti_(3)C_(2)T_(x)磷酸盐涂层在25~400℃下的摩擦学性能均得到显著提升。
As a typical environmental-friendly inorganic coating,the phosphate coating is widely used in aerospace,petroleum pipelines and marine equipment because of its strong adhesion,outstanding thermal stability and good corrosion resistance.In the present study,a phosphate bonding solid lubricant coating with excellent tribological properties at room temperature 25(RT)-400℃was prepared with MoS_(2)/Ti_(3)C_(2)T_(x) as solid lubricant,and its friction reduction and anti-wear mechanisms at different temperature were investigated in detail.Ti_(3)C_(2)T_(x) MXene with"accordion"shape was prepared with hydrofluoric acid as etching agent from MAX phase(Ti3AlC2)powders.And then MoS_(2)/Ti_(3)C_(2)T_(x) powders were prepared with thiourea,ammonium molybdate and MXene as raw materials.A Ti_(3)C_(2)T_(x) phosphate coating and A MoS_(2)/Ti_(3)C_(2)T_(x) phosphate coating were prepared with Al(H_(2)PO_(4))_(3) as binder and CuO as curing agent,and Ti_(3)C_(2)T_(x) and MoS_(2)/Ti_(3)C_(2)T_(x) as solid lubricant filler respectively.The friction coefficients and wear rates of the coatings at 25-400 ℃ high-temperature friction and wear tester and an optical digital microscope.The surface morphology and phase of the wear scars were analyzed with a scanning electron microscope(SEM),a confocal laser Raman spectrometer and an X-ray diffractometer(XRD)respectively,and then the wear mechanisms at different temperature were discussed in detail.The main results were as follows.When the mass ratio of Ti_(3)C_(2)T_(x) to Al(H_(2)PO_(4))_(3) was 2∶1,The friction coefficient and wear rate of the Ti_(3)C_(2)T_(x) phosphate coating were the lowest at RT,which were 0.38 and 2.75×10^(-4) mm^(3)/Nm,respectively.As the temperature increased,the friction coefficient of the Ti_(3)C_(2)T_(x) phosphate coating increased from 0.38 at RT(25℃)to 0.79 at 400°C,and the wear rate increased from 2.75×10^(-4) mm^(3)/(N·m)to 7.34×10^(-4) mm^(3)/(N·m).Compared with the Ti_(3)C_(2)T_(x) phosphate coating,the MoS_(2)/Ti_(3)C_(2)T_(x) phosphate coating
作者
方媛
闫嘉琪
赵顺强
曾立军
吴燕
FANG Yuan;YAN Jiaqi;ZHAO Shunqiang;ZENG Lijun;WU Yan(School of Material Science&Engineering,Shaanxi University of Science&Technology,Xi'an 710021,China;Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,Shaanxi University of Science&Technology,Xi'an 710021,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2024年第1期56-64,共9页
Surface Technology
基金
国家重点研发计划(2022YFB3809000)
国家自然科学基金(51705300)
陕西省科技厅自然科学基础研究计划(2022JM-267)
陕西科技大学博士科研启动基金(2017BJ-05)。
