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以纯氮气为气源,在Ti6Al4V合金表面进行离子渗氮而形成渗氮层。对渗氮层的显微组织、相结构及显微硬度等进行了分析,并用MMW-1A摩擦磨损试验机对渗氮层的摩擦学性能进行了研究。结果表明:在纯氮气、850℃的渗氮条件下,渗氮层主要由化合物Ti N、Ti2N和α-Ti等相组成;渗氮层的硬度较基体材料有较大提高;在滑动摩擦磨损试验中,渗氮层虽无减摩效果,但其耐磨性较基材大幅提高;未渗氮处理试样的磨损机理是磨粒磨损和局部的粘着磨损,渗氮后试样的磨损机理是磨粒磨损和局部的疲劳剥落。
Pure nitrogen as the gas source, in the Ti6Al4V alloy surface nitriding ion nitriding layer. The microstructure, phase structure and microhardness of the nitrided layer were analyzed. The tribological properties of the nitrided layer were studied by MMW-1A friction and wear tester. The results show that the nitriding layer mainly consists of the phases TiN, Ti2N and α-Ti under pure nitrogen and nitriding at 850 ℃. The hardness of nitrided layer is much higher than that of the matrix. Under the conditions of sliding friction and wear In the test, although the nitriding layer has no anti-friction effect, the wear resistance of the nitrided layer is much higher than that of the substrate. The wear mechanism of the non-nitrided sample is abrasive wear and local adhesive wear. The wear mechanism of the sample after nitriding Wear abrasive particles and local fatigue spalling.