采用空气助燃超音速火焰（HVAF）喷涂技术,分别以相同成分的气雾化合金粉体和低温球磨纳米晶合金粉体作为喂料,制备出高质量的耐磨耐蚀粗晶和纳米晶NiCrC合金涂层。利用SRV摩擦磨损试验机、表面形貌仪和扫描电镜等设备对两种涂层和45钢试样的滑动摩擦磨损行为进行了对比研究。结果表明：在载荷为10-30 N的无润滑剂常温滑动摩擦条件下,两种涂层具有较为接近的滑动摩擦系数,但纳米晶NiCrC涂层的抗磨损性能远优于常规粗晶涂层。三种测试材料都呈现出磨粒磨损和粘着磨损的特征,随着载荷的增加,磨损程度逐渐加剧,同时粘着磨损的特征更加突出。此外,两种涂层材料在磨损过程中都出现了颗粒部分或整体剥落的现象,加剧了涂层的磨损程度。
Conventional coarse-grained and nanocrystalline NiCrC alloy coatings for corrosion and wear protection were prepared by high velocity air-fuel（HVAF） spraying with the conventional gas-atomized and cryomilled nanocrystalline alloy powders as feedstock,respectively.The wear behavior of the two coatings and 45 steel under dry condition at ambient temperature were studied comparatively by a sliding,reciprocating and vibrating（SRV） tester,surface profiler and scanning electron microscopy（SEM）.The results show that under load of 10-30 N,the two types of NiCrC coatings possessed similar friction coefficients,however,the nanocrystalline coating exhibits a much better anti-wear property compared with its conventional counterpart.The wear mechanisms of the three test materials are abrasive wear and adhesive wear.With the increasing of load,the wear situation got more serious,meanwhile the characteristics of adhesive wear became dominant.Both the coatings exhibit falling-off of particles and particle fragments during the test,which accelerated the wear process.
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