钠离子交换型层状磷酸锆作为锂基脂添加剂的复配性能研究

SYNERGISTIC PROPERTY OF SODIUM-ION-EXCHANGED LAYERED ZIRCONIUM PHOSPHATE AS ADDITIVE IN LITHIUM-BASED GREASE

采用四球摩擦磨损试验机研究钠离子交换型层状磷酸锆(Na-α-ZrP)复配二烷基二硫代磷酸钼(MoDDP)作为锂基脂添加剂的摩擦学性能;借助3D光学表面轮廓仪、扫描电子显微镜、X射线能谱仪及X射线光电子能谱仪分析了钢球磨损表面形貌和化学元素分布及化学状态。结果表明:Na-α-ZrP和MoDDP作为复合添加剂显著提高了锂基脂的极压、减摩和抗磨性能,复合增效性随着载荷的增加而增强;其原因归结于在摩擦副表面形成了Na-α-ZrP物理保护膜和含Mo,S,P等元素的化学反应膜。

The tribological properties of sodium ion-exchanged layered zirconium phosphate(Na-α-ZrP)combined with molybdenum dialkyldithiophosphate(MoDDP)as a lithium-based grease additive was investigated by a four-ball tester.The morphologies,elemental distributions and chemical state of the worn surfaces were analyzed by 3D optical profiler,scanning electron microscope,X-ray energy spectrometer and X-ray photoelectron spectroscopy.The results indicated that Na-α-ZrP and MoDDP had outstanding synergistic effects on extreme pressure,friction-reducing and antiwear properties and the synergistic effects were enhanced with the increase of the tester load.The formation of Na-α-ZrP physical adsorption film and Mo,S and P elements chemical reaction film formed on the friction pair is the reason for outstanding synergistic effects.