PG-2齿轮油复合剂的摩擦学性能研究

Study on Tribological Behavior of PG-2 Gear Oil Additive Package

研制了同商用齿轮油添加剂Hitec343具有相似结构和组成的PG-2复合剂;通过热重分析考察了所研制的PG-2复合剂的热稳定性能;利用红外光谱分析考察了其化学结构特征;采用四球摩擦磨损试验机考察了其极压抗磨性能,并采用扫描电子显微镜分析了钢球磨损表面形貌.结果表明,所研制的PG-2复合剂具有优良的极压抗磨性能、防锈性能、防腐蚀性能及热稳定性,其总体性能同国外同类复合剂产品相当,而极压性能优于国外同类复合剂.

The PG-2 gear oil additive package with similar composition and structure as that of foreign commercial counterpart Hitec 343 was developed. The chemical structure of the developed gear oil additive package was analyzed by means of infrared spectroscopy, while its thermal stability examined by means of thermogravimetric analysis. The antiwear and extreme pressure properties of the PG-2 additive package as an additive in hydrogenated 80W/90 base stock were comparatively investigated on four-ball machines, using the Hitec 343 to control. The worn steel surface morphologies were observed on a scanning electron microscope, and the elemental distributions thereon were determined on an energy dispersive spectrometer (EDS). It was found that the PG-2 package has good thermal stability and comprehensive properties (antiwear, antirust, anticorrosion, and thermal stability) comparable to that of the commercial gear oil additive package Hitec 343, and the former has much better extreme pressure properties than the latter, which could be attributed to the stronger tribochemical interaction of the PG-2 additive with the rubbing steel surface. The worn steel surface lubricated with the hydrogenated 80W/90 oil containing Hitec 343 was characterized by mild scuffing, that lubricated with the base stock containing the PG-2 additive by mild adhesion wear and scuffing. Higher contents of S and P were detected by EDS on the worn steel surface lubricated by 80W/90 containing PG-2, which could account for the much better extreme pressure properties of the PG-2 additive than the Hitec 343 counterpart.