DMTD在Ti-DLC自配副摩擦界面的吸附及摩擦学行为的研究

采用非平衡磁控溅射技术制备了Ti掺杂的类金刚石(Ti-DLC)薄膜,用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分别对薄膜结构和断面致密度进行了分析.用球盘式往复摩擦试验机考察了薄膜与以聚a-烯烃(PAO)为基础油,2,5-二巯基-1,3,4-噻二唑(DMTD)衍生物作为添加剂复合后的摩擦学性能,同时采用X射线光电子能谱(XPS)对摩擦后的磨痕进行元素分析,并进行动力学计算.结果表明:添加剂分子DMTD分子以巯基S作为吸附点吸附在摩擦界面,扩散是吸附的控制因素,吸附过程跟表面的覆盖度无关,符合Langmuir吸附模型.最后讨论了液体添加剂分子在DLC表面的吸附过程和气体分子吸附过程不同的可能原因.

The Adsorption and Tribological Behavior of DMTD at the Self-Mated Ti-DLC Sliding Interface

In this work, the Ti-DLC film was prepared with the unbalance magnetron sputtering technique. Then, the Xray diffraction and scanning electron microscopy were carried to identify the micro-structure and the cross-section morphology of the prepared film. The friction behavior of the Ti-DLC/DMTD combination was evaluated by a CSM tribometer. X-ray photoelectron spectrometer as well as the theoretical calculation enabled us to draw a conclusion that DMTD adsorbed on the sliding interface though its excocyclic mercapto-S, and the adsorption was controlled by the diffusion of additive and irrelevant for surface coverage, which is coincided with Langmuir adsorption model. And the possible reason for the different adsorption behavior of liquid and gaseous molecules was also discussed.