火焰喷涂和等离子喷涂FeCrBSi涂层及其防滑和耐磨性能研究

目的采用大气等离子喷涂(APS)和火焰喷涂(FS)在304不锈钢基体上制备FeCrBSi涂层,并对比研究两种工艺制备涂层的防滑和耐磨性能。方法通过光学显微镜、场发射扫描电镜和X射线衍射仪对涂层的显微形貌和结构进行分析,通过维氏硬度计测试涂层的显微硬度。采用摩擦磨损试验机和三维光学显微镜,测量涂层在干摩擦条件下的摩擦系数和磨损量。结果两种喷涂方法制备的涂层多孔,在喷涂过程中极少发生氧化。与火焰喷涂涂层(749HV0.1)相比,大气等离子喷涂涂层(837HV0.1)具有更高的维氏硬度值。在摩擦试验中,火焰喷涂涂层的磨损率为(38.63±2.37)×10~(-6)m~3/(N·m),而大气等离子喷涂涂层的磨损率为(9.5±0.49)×10~(-6)m~3/(N·m),但两种涂层的摩擦系数区别较小,在频率2 Hz、载荷10 N的条件下的摩擦系数为0.6~0.7。结论两种涂层的磨损机制均为疲劳磨损,喷涂态FeCrBSi涂层具有较好的防滑耐磨性能,且大气等离子喷涂涂层性能优于火焰喷涂涂层。

Flame Sprayed and Atmospheric Plasma Sprayed FeCrBSi Coatings and Their Skid and Wear Resistance

The work aims to investigate and compare skid and wear resistance of FeCrBSi coatings by preparing the coatings on 304 stainless steel substrate by atmospheric plasma spray (APS) and flame spray (FS) techniques, respectively. Microstructure and structure of the coatings were analyzed with optical microscope (OM), field-emission scanning electron microscope (FE-SEM) and X-ray diffracto-meter (XRD), and microhardness with Vickers hardness tester. Friction coefficients and wear volume of the coatings under dry lubrication conditions were measured with friction-abrasion testing machine and three-dimensional optical microscope. FeCrBSi coatings prepared in both spraying methods were porous and rarely oxidized during the spraying process. APS coating exhibited considerably higher hardness (837 HV0.1) than the FS coating (749 HV0.1). In friction test, wear rate of APS coating was (9.5±0.49)×106 m3/(N·m), much lower than that of FS coating ((38.63±2.37)×106 m3/(N·m)). However, the friction coefficients of the two coatings were very close, the value between was 0.6~0.7 at 10 N load and 2 Hz frequency. The main wear mechanism of the two coatings was fatigue wear. The as-sprayed FeCrBSi coatings have good skid and wear resistance, and the performance of APS coating is superior to that of FS coating.