(1. 安徽工業(yè)大學 機械工程學院，馬鞍山 243002；
2. 合肥工業(yè)大學 機械工程學院，合肥 230009)
摘 要: 為改善邊界潤滑工況下鐵基含油軸承材料的摩擦學性能，采用低溫液體滲硫技術在材料表面形成一層固體滲硫層，微觀檢測滲硫層形貌與成分，并在端面摩擦磨損試驗機上進行摩擦學實驗，分析其摩擦磨損性能與自潤滑機理。結果表明：滲硫層中固體潤滑劑的主要成分為FeS，硫化物沿著基體孔道由材料表面向內(nèi)部擴散，滲硫層的厚度約為15 μm；與未硫化材料相比，硫化材料的摩擦因數(shù)明顯降低，且硫化時間越長，軸承表面滲硫層的減摩性能越好；表面硫化改性后，利用軸承基體多孔含油與表面滲硫層的液固協(xié)同潤滑作用，其綜合摩擦磨損性能比單純固體潤滑或單純油潤滑的減摩性能都要好，邊界潤滑工況下的抗擦傷、抗咬合性能得到改善。
關鍵字: 鐵基軸承材料；粉末冶金；硫化；液固協(xié)同潤滑
（1. School of Mechanical Engineering, Anhui University of Technology, Ma’anshan 243002, China;
2. School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, China）
Abstract:To improve the tribological properties of iron-based oil materials under boundary lubrication, a solid sulfurization layer was formed on the materials surface by low-temperature liquid sulphurizing technology. The morphology and composition of the solid sulfurization layer were sutided. The tribological experiments were tested on the end-face friction and wear tester to reveal its self-lubricating mechanism. The results show that the main composition of the sulfide layer is FeS. The sulfide diffuses from the surface to the interior along the matrix pore, and the thickness of the sulfide layer is about 15 um. Compared with the unvulcanized sample, the friction coefficient of the vulcanized sample is obviously lower. And the longer the vulcanization time, the better the lubrication property. After surface modification, the comprehensive friction and wear performance is better than that of only solid or oil lubrication for the liquid-solid synergetic lubrication. And the anti-abrasion and anti-occlusal properties are improved under the boundary lubrication condition.
Key words: iron-based bearing material; powder metallurgy; surface sulphurizing; liquid-solid synergistic lubrication
