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采用高温真空烧结法在高速钢基体表面上制备了纳米氧化镧掺杂二硅化钼基复合涂层;考察了温度(200~800℃)、纳米La_2O_3含量(1%、3%和5%)(质量比)对MoSi_2基复合涂层高温摩擦学性能的影响规律;采用X射线衍射表征了MoSi_2基复合涂层高温摩擦磨损前后的微结构,探讨了复合涂层的高温摩擦磨损机理。研究结果表明纳米La_2O_3掺杂MoSi_2基复合材料摩擦学性能在低温(200℃)和高温(800℃)下纳米La_2O_3含量为3%时较好,摩擦系数为0.1。通过引入纳米La_2O_3可有效地改善Mo Si2的高温摩擦学性能,其磨损机理主要为磨粒磨损、粘着磨损和氧化磨损的复合磨损。
The lanthanum-doped lanthanum-doped molybdenum disilicide-based composite coating was prepared on the surface of HSS by high-temperature vacuum sintering. The effects of temperature (200-800 ℃), nano-La2O3 content (1%, 3% and 5% Mass ratio) on the tribological properties of MoSi_2-based composite coating at high temperature. The microstructure of MoSi_2-based composite coating before and after high temperature friction and wear was characterized by X-ray diffraction. The mechanism of high temperature friction and wear of the composite coating was discussed. The results show that the tribological properties of nano-La 2 O 3 -doped MoSi_2 composites are better when the nano-La 2 O 3 content is 3% at low temperature (200 ℃) and high temperature (800 ℃), and the friction coefficient is 0.1. The introduction of nano-La 2 O 3 can effectively improve the tribological properties of Mo Si 2 at high temperature. The wear mechanism is mainly abrasive grain wear, adhesive wear and oxidation wear composite wear.