【摘要】 表面纳米化可以显著改善金属材料的表面力学性能,并促进氮、铬等原子的热扩散,文中尝试采用表面纳米化技术改善金属基体/硬质薄膜的力学性能。对304不锈钢采用表面机械研磨处理获得纳米晶粒表层,采用多弧离子镀镀方法在表面纳米化和粗晶粒的304不锈钢基体上沉积CrN薄膜。对两种膜基体系采用X射线衍射、显微硬度测试、压入法和划痕法膜基结合性能评价。结果表明,表面纳米化影响了CrN膜层的组织结构,明显提高了膜基体系的硬度和承载能力,还改善了膜层的韧性,膜基结合性能也得到提高。更多还原

【Abstract】 Surface nanocrystallization(SNC) can markedly improve surface mechanical properties of metallic materials and accelerate thermal diffusion of N,Cr,etc atoms.In this work we study the effects of SNC on mechanical properties of hard coating on metallic substrate.AISI 304 stainless steel was subjected to surface mechanical attrition treatment to obtain nanocrystalline surface layer.CrN film was deposited on nanocrystalline and coarse-grained 304 steel substrates by arc ion plating.The x-ray diffraction,microhardness test,adhesion tests of indentation and scratch methods showed that the film structure was varied by SNC;the hardness and load-bearing capability of the film/substrate system were obviously enhanced,the film toughness was improved,and the film adhesion was increased by SNC.更多还原