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用四球摩擦磨损试验机考察了脂肪酸修饰TiO2纳米微粒水溶液润滑下GCr15钢的摩擦磨损性能,并用电子探针和X射线光电子能谱研究了钢球磨损表面边界润滑膜的化学组成和元素分布.摩擦磨损试验结果表明:脂肪酸修饰TiO2纳米微粒在水中具有较好的润滑性能、良好的极压性能及较高的承载能力.添加质量分数为0.1%～1.0%的油酸TiO2纳米微粒可使水的承载能力提高6～12倍,烧结负荷提高51～100%,抗磨减摩性能也有较大提高,卡咬负荷由150N提高至1000～1800N.磨损表面分析表明:油酸TiO2纳米微粒在较高负荷(>300N)下发生了摩擦化学反应,生成含TiO2及油酸复合物的边界润滑膜,从而起减摩抗磨作用
The friction and wear properties of GCr15 steel lubricated with fatty acid modified TiO2 nanoparticles were investigated by using a four-ball friction and wear tester. The chemical composition and elemental distribution of the lubricant film on the worn surface of the steel ball were investigated by electron probe and X-ray photoelectron spectroscopy. The results of wear test show that the fatty acid modified TiO2 nanoparticles have good lubricating properties, good extreme pressure performance and high carrying capacity in water.The addition of oleic acid TiO2 nano-particles with the mass fraction of 0.1% -1.0% The loading capacity increased by 6 ~ 12 times, the sintering load increased by 51 ~ 100%, the wear resistance and friction reduction performance also increased greatly, the card bite load increased from 150N to 1000 ~ 1800N. The wear surface analysis showed that the oleic acid TiO2 nanoparticles were higher Frictional chemical reaction occurs under load (> 300N) to form a boundary lubrication film containing TiO2 and oleic acid complex, thus playing a role of anti-friction and anti-wear