SiC颗粒尺寸对镁合金化学镀Ni-P-SiC层摩擦学性能的影响

Effect of Silicon Carbide Particle Size on Wear Resistance of Electroless Nickel-Phosphorous-Silicon Carbide Composite Coatings of Magnesium Alloy Substrate

为了探讨SiC颗粒尺寸对Ni-P-SiC化学镀层摩擦学性能的影响,在Ni-P化学镀液中分别加入纳米、亚微米、微米SiC颗粒制备Ni-P-SiC复合镀层,采用扫描电镜(SEM)、能谱仪、硬度计、摩擦磨损试验机等研究了SiC颗粒尺寸对Ni-P-SiC镀层形貌、成分、硬度、耐磨性的影响。结果表明:亚微米SiC制成的复合镀层表面晶簇均匀,晶胞细小;亚微米SiC强化镀层的效果最理想,镀层硬度最大,摩擦系数约为0.33,耐磨性最好。

Ni-P-SiC composite coatings were prepared on Mg alloy substrate via electroless plating while SiC particulates with different sizes(nanoscale,sub-micron and micron) were separately introduced as reinforcing phases into the electroless plating bath.The effect of SiC size on the morphology,composition,hardness and wear resistance of as-obtained Ni-P SiC composite coatings was investigated with a scanning electron microscope,an energy dispersive spectrometer,a hardness meter,and a friction and wear tester.It was found that Ni-P-SiC composite coating reinforced with sub-micron SiC particles contained uniform and fine surface crystal clusters,and showed the highest hardness and the best wear resistance(with a friction coefficient of 0.33).