硫化廿二酸钼的合成及其摩擦化学研究

STUDY ON TRIBOCHEMISTRY OF MOLYBDENUM SULPHURIZED DOCOSANATE AND ITS SYNTHESIS

通过低温硫化工艺和复分解反应合成了硫化廿二酸钼，并在四球机上考察了硫化廿二酸钼的摩擦学特性。实验结果发现硫化廿二酸钼的抗磨极压性超过了目前国内外传统的抗磨极压剂硫化异丁烯（Ａｎｇｌａｍｏｌ３３），二烷基二硫代磷酸锌（ＺＤＴＰ），以４００＃中性油作基础油，四球磨斑直径ｄ３９２Ｎ３０ｍｉｎ依次为０．５６ｍｍ、０．６２ｍｍ和０．８２ｍｍ，最大无卡咬负荷ＰＢ值相应为１１７６Ｎ、１１２７Ｎ和９８０Ｎ，摩擦系数ｆ值比基础油下降了４０％。用俄歇能谱（ＡＥＳ）分析了摩擦表面膜，发现在表面深层为５０处富含硫和钼，并在该处两者都达到了峰值。据此认为硫化廿二酸钼的减摩、抗摩和极压作用机理是在摩擦表面生成了ＦｅＳ（或ＦｅＳ２）和层状结构ＭｏＳ２的复合无机膜，由于复合膜和ＭｏＳ２层的扩散渗硫、渗钼作用，增强了复合无机膜的强度，同时由于复合无机膜和ＭｏＳ２层在摩擦时的相对滑移作用，使硫化廿二酸钼具有减摩、抗摩和极压功能。此外，还提出了润滑膜的结构模型。

Molybdenum sulphurized docosanate (MoSD) was synthesized by using sulphurization at low temperature and redecomposition reaction,and its tribological characteristics was observed and studied on the four ball machine.The experimental results were discovered that the antiwear and extreme pressure (EP) properties of MoSD are better than that of traditional antiwear and EP agents such as sulphurized isobutylene (Anglamol 33),Zinc dialkyldithiophosphates (ZDTP) at home and abroad.The wear spot diameters d 392 N 30′ of 400 # netral base oil with molybdenum sulphurized docosanate,sulphurized isobutylene and ZDTP as additive is 0.56,0.62 and 0.82 mm,in proper order,maximum non scuffing load PB value is 1176,1127 and 980N coresponding to those oils.The frictional coeffient is 40% less than that of base oil.The rich sulphur and molybdenum on the friction surface were determinated by using Auger Energy Spectroscopy (AES) in the depth of 50 ,and where the both reached the peak value. According to those results, we think that the functional mechanism of friction reducing,antiwear and extreme pressure is that the composite inorganic film containing FeS or FeS 2 and layer structure MoS x on the rubbing surface is formed,the strength of composite inorganic film is reinforced owing to diffusion and penetration of molybdenum and sulphur in the composite film and MoS x layer. In the meanwhile, because of the relative sliding function between the composite film and MoS x layer in the rabbing process, those above reasons lead friction reducing, antiwear and extreme pressure function of MoSD. In addition,the structure model of lubrication films was proposed also.