水基MWCNTs/MoS_(2)复合纳米流体的摩擦学性能研究

Preparation and Tribological Properties of Water-Based CNTs/MoS_(2) Composite Nanofluid

使用离子液体[EMIm]BF_(4)分散多壁碳纳米管(MWCNTs),再以[EMIm]BF_(4)-阿拉伯树胶(GA)为添加剂分散二硫化钼(MoS_(2)),二者的水溶液复配得到复合纳米流体.采用拉曼光谱分析了MWCNTs的改性度,通过吸光度和粒度对复合纳米流体的分散与悬浮稳定性进行了表征.对不同纳米颗粒配比的复合纳米流体润湿性能和摩擦学性能进行测试,结果表明:MWCNTs和MoS_(2)质量分数为0.6%、1.2%时复合纳米流体的铺展成膜能力最好,其接触角约为63.04°,相比于去离子水降低了23.55%.摩擦磨损测试结果也表明此配比下的减摩抗磨性能最佳,平均摩擦系数为0.073,比去离子水降低了61.98%,同时体积磨损率降低了67.87%.磨痕形貌观测表明,最优配比下磨痕浅,且表面光滑、无犁沟.X射线光电子能谱(XPS)表明MWCNTs和MoS_(2)共同参与摩擦并在基底成膜,由此协同实现了高效润滑.

The ionic liquid [EMIm]BF_(4) was used to disperse multi-walled carbon nanotubes(MWCNTs),and[EMIm]BF_(4)-Gum Arabic(GA) was used as an additive to disperse molybdenum disulfide(MoS_(2)).The two aqueous solutions were mixed to obtain a composite nanofluid.Raman spectroscopy was used to analyze the degree of modification of MWCNTs,and the dispersion and suspension stability of the composite nanofluid were characterized by absorbance and particle size.The wetting and tribological properties of the composite nanofluids with different nanoparticle ratios were measured.The results showed that for the mass fractions of MWCNTs of 0.6% and MoS_(2) of 1.2%,the fluid had the best spreading and film forming ability.Its contact angle was about 63.04°,which was 23.55%lower than deionized water.In addition,the anti-wear performance was the best.In specific the average friction coefficient was 0.073,which was 61.98% lower than deionized water,and the volume wear rate was reduced by 67.87%.The wear scar was shallow and the surface was smooth without furrows.X-ray photoelectron spectroscopy showed that MWCNTs and MoS_(2) engaged in friction and produced a film on the substrate,thereby synergistically achieving highefficiency lubrication.