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采用高压直流等离子体氮化技术,对医用锻造钴铬钼合金进行表面氮化处理,考察了氮化温度对钴铬钼合金摩擦性能及润湿性能的影响。运用X射线衍射仪分析氮化层物相组成,显微硬度计和光学动/静态接触角仪测试合金表面显微硬度及接触角数值;利用球-盘摩擦实验在干摩擦条件下对氮化层的摩擦磨损性能进行测试。实验结果表明:医用锻造钴铬钼合金经高压直流等离子体氮化处理后,形成硬质化合物CrN和Cr2N,氮化层厚度4.5~9.5μm,合金显微硬度随氮化温度升高而增加,最高可达788HV。与未处理合金试样相比,氮化合金的亲水性及耐磨损性得到明显改善,氮化温度为800℃时磨损率最低,磨痕宽度最窄,耐磨损性能最佳。
The high-voltage direct current plasma nitriding technology was used to surface nitriding medical forged cobalt-chromium-molybdenum alloy. The effect of nitriding temperature on the tribological properties and wetting properties of cobalt-chromium-molybdenum alloy was investigated. The microhardness and contact angle of the nitrided layer were measured by X-ray diffractometer (XRD). The microhardness and optical dynamic / static contact angle were used to test the microhardness and contact angle of the alloy surface. Layer friction and wear properties of the test. The experimental results show that the hard forging cobalt-chromium-molybdenum alloy is nitrided by high-voltage direct current plasma to form hard compounds CrN and Cr2N, the thickness of the nitride layer is 4.5-9.5 μm, the microhardness of the alloy increases with the increase of the nitriding temperature, Up to 788HV. Compared with the untreated alloy sample, the nitriding alloy has obvious improvement in hydrophilicity and abrasion resistance. When the nitriding temperature is 800 ℃, the wear rate is the lowest, the wear scar width is the narrowest, and the wear resistance is the best.