Lubricated Conditions Imposed on Coating Multi-layer on Wear Resistance Under Cr2O3 Effect

Lubricated pin-on-disk sliding wear tests were performed on applied to Al-0.1Mg-0.35Ni-Si Alloy by using the spray coating method has been investigated. Different loads were 5, 10, and 15 N at a sliding velocity, 1.32 m/s at room temperature and 60% relative humidity. The surfaces were analyzed by using X-ray diffraction the residual (XRD), energy dispersive (EDS), scanning of (SEM) and (AFM), respectively. The results have showed that the thickness of Cr2O3 coating was significantly related under the identical cold spray condition. These methods have contributed much of the understanding of quality and properties of surfaces. The (Cr2O3) coating has great potential as a wear-resistant. The hardness increased from 102 ± 5 HV to 116.4 ± 2.5 HV at coating thickness 45 µm and friction coefficient reduced from 0.29 to 0.24; and the wear rate was about 2.11X10-13 m3N-1m-1 while hardness was increased from 102 ± 5 HV to 108 ± 3.5 HV at coating thickness 15 µm. The friction reduced from 0.31 to 0.29 at same coating thickness alloys, and the wear rate was about 2.73X10-13 m3N-1m-1. The tribological properties of Cr2O3 coating have exhibited low friction and beneficial to improve the adhesion which was clear on worn surfaces of Cr2O3 coating. Crack, powder flocculation and powder formation are caused by the wear mode of the surface. Brittle fracture was found; while, adhesion and oxidation are the main mechanism of wear during the test.

本研究针对采用喷涂法制备的Al-0.1Mg-0.35Ni-Si合金试样开展了润滑销盘滑动磨损试验。试验参数设置如下：载荷分别为5、10、15 N，滑动速度为1.32 m/s，试验环境为室温、相对湿度60%。采用X射线衍射（X-ray Diffraction, XRD）、能量色散光谱（Energy Dispersive Spectroscopy, EDS）、扫描电子显微镜（Scanning Electron Microscopy, SEM）与原子力显微镜（Atomic Force Microscopy, AFM）对试样表面进行了表征。结果表明，在相同冷喷涂工艺条件下，Cr₂O₃涂层的厚度与磨损性能显著相关。上述表征方法为深入解析该合金表面的质量与性能提供了重要支撑。该Cr₂O₃涂层具备优异的耐磨应用潜力。当涂层厚度为45 μm时，涂层硬度从102 ± 5 HV提升至116.4 ± 2.5 HV，摩擦系数从0.29降至0.24，磨损率约为2.11×10⁻¹³ m³·N⁻¹·m⁻¹；而当涂层厚度为15 μm时，涂层硬度从102 ± 5 HV提升至108 ± 3.5 HV，合金的摩擦系数从0.31降至0.29，磨损率约为2.73×10⁻¹³ m³·N⁻¹·m⁻¹。Cr₂O₃涂层的摩擦学性能表现为低摩擦特性，且有助于提升涂层与基体的结合强度，这一点在Cr₂O₃涂层的磨损表面上可清晰观察到。该合金表面的磨损过程会产生裂纹、粉末絮凝与粉末团聚现象，试验中还观测到脆性断裂；而粘着磨损与氧化磨损为本次试验的主要磨损机制。