油酸修饰TiO2纳米微粒水溶液润滑下GCr15钢摩擦磨损性能研究

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

Study on the Friction and Wear Properties of GCr15 Steel under Lubrication of Water Containing Oleic Acid Modified TiO 2 Nanoparticle

Oleic acid (OA) surface modified TiO 2 nanoparticles with average diameter of 30 nm were chemically synthesized. The tribological properties of GCr15 (SAE52100) steel under the lubrication of OA TiO 2 nanoparticle/water were evaluated with a four ball tester. The rubbed surface of the steel was analyzed with X ray photoelectron spectroscopy (XPS) and electron probe microanalysis (EPMA). The results show that OA TiO 2 nanoparticle as additive in water exhibits good performance in antiwear and friction reduction as well as in load carrying capacity. The maximum non seizuer load ( p B value) can be raised by 6 10 times when 0.1 1.0 % OA TiO 2 nanoparticle was added into water. The results of surface analysis indicate that a boundary film mainly composed of TiO 2 and titanates formed on the rubbed surface. This contributes to decrease the friction and wear of GCr15/GCr15 steel pair.