钢表面钼沉积及渗硫复合改性层的摩擦学性能

Tribological Properties of Molybdenum Ion-Plated and Ion-Surfurized Composite Coating on Mild Steel

采用多弧离子镀及低温离子渗硫复合镀渗工艺在45#钢表面制备了含MoS2的钼基复合表面改性薄膜,在QP-100型球-盘式摩擦磨损试验机上考查了复合薄膜在油润滑条件下的摩擦学性能.用原子力显微镜及扫描电子显微镜观察分析了薄膜表面、截面和其磨损表面形貌及成分,用X射线衍射仪及俄歇电子能谱仪分析了薄膜的相结构及组成元素沿深度分布.结果表明,含MoS2的复合镀渗薄膜由Mo、MoS2及少量FeS组成,其在油润滑条件下同轴承钢对摩时表现出优良的摩擦学性能.

Mobased composite surfacemodifying coating containing MoS2 was prepared on 1045 steel by multiarc ion plating and low temperature ion sulfurization. The phase composition and elemental depth profiles of the resulting coatings were analyzed by means of Xray diffraction and Auger electron spectroscopy. The tribological properties of the composite coating sliding against SAE52100 steel under oillubricated condition were investigated on a QP100 friction and wear tester in a ballondisc contact configuration. The morphology of the coating was observed with an atomic force microscope, while its worn surface and crosssection morphologies were analyzed using a scanning electron microscope. As the results, the composite coating was composed of MoS2, Mo, and a small amount of FeS. The composite coating had much better frictionreducing and wearresistant ability than the Mo ionplated or ionsulfurized surfacemodifying layers. This was because the harder Moenriched subsurface had good support to the softer MoS2enriched superfacial layer, which contributed to reduce the friction and wear significantly.