ZDDP与MoDTC在含酯类油的PAO基础油中的抗磨性能研究

将二烷基二硫代磷酸锌(ZDDP)和二烷基二硫代氨基甲酸钼(MoDTC)分别加入聚ɑ-烯烃（PAO）、PAO与分散剂、PAO与酯类油3种试样中，进行四球机抗磨试验，考察ZDDP和MoDTC对不同试样的感受性。将ZDDP和MoDTC两种添加剂进行复配试验，并通过扫描电镜观察磨斑形貌。试验结果表明：酯类油能够很好地提高PAO基础油的抗磨性能，其质量分数为5%～10%时即可达到较好的抗磨性能；PAO与分散剂试样中，增大ZDDP的加入量不能有效地降低磨斑直径，增大MoDTC的加入量可降低磨斑直径；PAO与酯类油试样中，随着ZDDP加入量的增加，磨斑直径减小，ZDDP的抗磨效果优于MoDTC；两种添加剂复配后与单剂相比无明显的增效作用。磨斑形貌分析结果表明：加入MoDTC的基础油试验测得的磨斑表面平整，对摩擦表面修复作用更佳，同时添加ZDDP与MoDTC的基础油，试验测得的表面磨痕不规则，两剂具有竞争关系。

STUDY ON ANTI-WEAR PERFORMANCE OF ZDDP AND MoDTC IN PAO BASE OIL CONTAINING ESTER

The additives of zinc dialkyldithiophosphate (ZDDP) and molybdenum dialkyldithiocarbamate (MoDTC) was respectively added into samples of poly alpha olefin (PAO), PAO with dispersant and PAO with ester. The sensitivities of ZDDP and MoDTC in different samples were investigated by the grinding test of four-ball machine. In other test, the two additives were mixed and added into the samples and tested by scanning electron microscopy to observe the wear scar on the surface. The results indicated that the ester oil with a mass fraction of 5%-10% improved well the anti-wear performance of PAO base oil. For the PAO with dispersant T154B，the increase of ZDDP could not effectively reduce the diameter of the wear scar, while the increase of MoDTC could. In the ester-containing PAO base oil sample，the diameter of the wear scar was decreased when the ZDDP increased, indicating that the anti-wear effect of ZDDP was better than the MoDTC. No obvious synergistic effect was found for the composite additives compared with the single one. The analysis of wear scar morphology showed that the surface was flat, showing that the MoDTC had better effect on the repair of the worn surface. When ZDDP and MoDTC coexisted in the sample, the surface of the wear scar was irregular, indicating a competitive relationship between the two additives.