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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。
The air-assisted combustion HVOF spraying technique was used to prepare high-quality wear resistant and corrosion resistant coarse grains and nanocrystalline NiCrC powders with the same composition of aerosolized alloy powders and low-temperature ball mill nanocrystalline alloy powders respectively Alloy coating. The friction and wear behaviors of the two coatings and the specimens of 45 steel were compared using SRV friction and wear tester, surface profilometer and scanning electron microscope. The results show that the sliding friction coefficients of the two coatings are close at room temperature without friction, and the wear resistance of the nanocrystalline NiCrC coating is much better than that of the conventional coarse-grained coating . All three kinds of test materials showed the characteristics of abrasive wear and adhesive wear. With the increase of load, the degree of wear increased and the characteristics of adhesive wear became more prominent. In addition, the two coating materials in the process of wear and tear have occurred in part or the whole particles of the phenomenon of exfoliation, exacerbated the wear degree of the coating.