膜控制扩散制备纳米镧化合物及其摩擦学性能

通过石蜡膜控制沉淀离子扩散速率,采用尿素水解制备镧化合物,对其进行热重分析确定焙烧温度,运用XRD、TEM等表征手段对其进行表征,物相分析表明焙烧产物主要成分为La5O7NO3,粒径约为40 nm。合成两性表面活性剂对纳米镧化合物进行表面修饰,使其能稳定分散于液体石蜡基础油中。以液体石蜡为润滑油基础油,添加基础油质量0.5%的表面活性剂修饰后的纳米镧极压抗磨剂,结果表明,极压性提高33.33%、磨损性减小20%左右。

Preparation of Nanometer Lanthanum by Paraffin Film Diffusion Control and Study of Its Antiwear Property

Firstly,nanomaterial La5O7NO3 was synthesized via precipitation method with paraffin film diffusion control.XRD and TEM analyses show that the product is La5O7NO3 paticles about 40 nm in diameter.Then,rare earth compound nanoparticles modified by amphoteric surfactant were prepared.The modified particles show good dispersivity and stability in paraffin liquid base oil,and their friction and wearing behaviors in lubricating oils were evaluated with four-ball machine.Adding La5O7NO3 nanoparticles in paraffin liquid base oil,and testing their grinding function,when the adding weight percent of La5O7NO3 is 0.5%,the extreme-pressure is raised for 33% and the wearing rate decreases by 20%.