极压添加剂对陶瓷涂层摩擦学性能的影响

作者用HQ-1型环-块试验机考察了几种极压添加剂对陶瓷涂层摩擦学性能的影响,试验结果表明,陶瓷涂层的磨损性能明显地依赖于摩擦副材料的选择和极压添加剂的种类,而其摩擦性能对此却不很敏感;二烷基二硫代磷酸锌和磷酸三甲酚酯对Cr_2O_3/Cr_2O_3、Cr_2O_3/WC、Cr_2O_3/ZrO_2和Cr_2O_3/TiO_2涂层摩擦副都具有良好的抗磨效果,而PN剂显示的抗磨效果却很差,甚至还有明显的增磨作用。通过电子探针和X-射线光电子能谱仪对TiO_2涂层试块的磨损表面观察发现,润滑油及其极压添加剂在摩擦过程中于磨痕内外都形成了吸附膜,二烷基二硫代磷酸锌和磷酸三甲酚酯的抗磨性能主要归因于它们在陶瓷涂层表面的物理吸附。

Effects of Extreme Pressure Additives on Friction and Wear Properties of Ceramic Coatinqs

The effects of several extreme pressure (EP) additives on friction and wear properties of ceramic coatings was studied using a block-on-ring test machine at ambient condition. The results shown that the wear property of ceramic coating depends strongly on the combination of tribo-couples and types of EP additives, while the friction properly is insensitive to these factors. Of EP additives used in this experimenty Zinc dialkyldithiophosphate (ZDDP) and tricresyl phosphate (TCP) have significant wear-reducing function for various tribo- couples, whereas the P-N agent is not good at antiwear effect even it has the wear-increasing effect. It is also found through EPMA and XPS analyses of worn surfaces of TiO2 coatings that adsorbed layers of lubricating oils and additives were formed on wear tracks and outside during rubbing process, wear-resistance of ZDDP and TCP is due to the physical adsorption of them on ceramic coating surfaces.