TiO2纳米微粒—茶皂素水基乳化液的切削行为研究

采用溶胶 -凝胶表面修饰法合成了粒径为 4 0～ 6 0 nm的油酸修饰二氧化钛纳米微粒 ,首次尝试以天然产物提取物——茶皂素为表面活性剂将其均匀分散在水中 ,研究了复配体系的抗磨和切削性能 .结果表明 :在有机修饰层和无机纳米核交联作用下 ,复配体系具有较好的减摩抗磨作用 ;最大无卡咬负荷可达 80 4 N,而在茶皂素质量分数达到一定值 (>2 % )时 ,烧结负荷和攻丝扭矩值都有较大的改善

Study on the Cutting Properties of a Water-Based Emulsified Liquid Containing OA-TiO2 Nanoparticles and Tea Saponins

TiO 2 nanoparticles surface modified with cis 9 octadecenoic acid (OA) with average diameter of 50 nm was chemically synthesized by sol gel method. The resulting surface modified nanoparticles were characterized by means of infrared spectrometry and transmittance electron microscopy. They were also dispersed in water in the presence of tea saponins as surfactant, so as to obtain an O/W emulsified liquid. The tribological and cutting properties of the composite emulsified liquid were evaluated with a four ball tester and a metal cutting fluid tapping torque evaluation tester. The results show that the emulsified liquid exhibits good tribological behavior and cutting performance. The maximum non seizure load ( p B value) of the fluid is as high as 804 N, while the welding load ( p D value) and tapping torque are considerably increased at proper concentrations of the tea saponins (>2.5%).