Tribological Behavior of Plasma Mo-Alloyed Layer on TC11 Alloy under Different Loads

摘要:

采用双辉等离子冶金技术制备渗Mo层，并研究其不同载荷下的摩擦行为和磨损机制。采用SEM、EDS和XRD表征渗Mo层的微观形貌、成分分布以及相结构。结果表明：渗Mo层厚度为20 μm，致密均匀，其相主要为Mo、Al3Ti和Al8(Ti3-xMox)。为了研究渗Mo层的摩擦行为，分别在载荷1.3，5.3和9.3 N对其进行滑动磨损试验。随着载荷的增加，渗Mo层的平均摩擦系数和磨损率都呈上升趋势。根据载荷1.3 N条件下的三维形貌、SEM照片和能谱分析，得出其磨损机制为轻微磨粒磨损和氧化磨损；在载荷5.3 N条件下，氧化磨损和磨粒磨损为主要磨损机制；在载荷9.3 N条件下，主要磨损机制为氧化磨损、磨粒磨损和粘着磨损。

Abstract:

The tribological behavior and wear mechanism of a Mo-alloyed layer prepared by a double-glow plasma surface alloying technique were investigated under different loads. The microstructure, the composition distribution and the phase structure of the Mo-alloyed layer were characterized by SEM, EDS and XRD, respectively. The results show that the uniform and compact Mo-alloyed layer with 20 μm thickness is composed of phases Mo, Al3Ti and Al8(Ti3-xMox). The sliding wear experiments were performed under different loads (1.3, 5.3 and 9.3 N) in order to examine the tribological properties of the Mo-alloyed layer. The average friction coefficients and the wear rates of Mo-alloyed layer both show an upward tendency with the increased of loads. Mild abrasion wear and oxidative wear could be detected under 1.3 N load based on the analysis results of 3D surface morphologies, SEM and EDS. The wear mechanism under 5.3 N load is dominated by oxidative wear and abrasion wear. Oxidative wear, abrasion wear and adhesive wear are the main wear mechanism under 9.3 N.