载荷对钛合金Al2O3Y2O3/AlY复合涂层摩擦学性能的影响

为了提高耐摩擦磨损性能,采用磁控溅射技术在γTiAl钛合金表面制备了Al2O3Y2O3/AlY复合涂层。检测了涂层的厚度、表面硬度、微观组织和成分变化。通过在130g、230g和330g载荷下采用GCr15钢球作摩擦副进行的摩擦磨损试验,研究了有和无复合涂层的γTiAl合金的耐摩擦磨损性能。结果表明:Al2O3Y2O3/AlY复合涂层的厚度约为33μm,由Al2O3Y2O3层、AlY层和扩散层组成,平均表面硬度为433.4HV0.1。带复合涂层的γTiAl合金摩擦因数和比磨损率均比无涂层γTiAl合金的小。在不同的摩擦磨损试验载荷下,无涂层γTiAl合金的磨损机制为磨粒磨损和黏着磨损,而有Al2O3Y2O3/AlY复合涂层的γTiAl合金则主要是磨粒磨损和氧化磨损。

Effect of Load on Tribological Properties of Al2O3-Y2O3/Al-Y Composite Coatings

Al2O3-Y2O3/Al-Y composite coating was prepared onγ-TiAl titanium alloy by using a magnetic control sputtering technology to improve its friction-wear resistance.The composite coating was tested for thickness,surface hardness,microstructure and change in composition,and friction-wear tests were carried out under loads of 130 g,230 g,and 330 g and by using Grl5 steel boll as frictional pairs for the purpose of discovering friction-wear resistance of theγ-TiAl alloy without and with the Al2O3-Y2O3/Al-Y composite coating.The results showed that the Al2O3-Y2O3/Al-Y composite coating was as thick as about 33μm,consisted of Al2O3-Y2O3 layer,Al-Y layer and diffusion layer,and exhibited average surface hardness of 433.4 HVO.1.Friction coefficient and specifie wear rate of theγ-TiAl alloy with composite coating were less than those of one without the coating.Under different friction-wear test load,the wear mechanisms were abrasive wear and adhesive wear for theγ-TiAl alloy without the coating,and abrasive wear and oxidative wear for theγ-TiAl alloy with the composite coating.