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高温低能高电流密度离子注入技术,已表明可以显著改善各种材料的摩擦学性能。本文综述了此领域中一些研究结果,并在奥氏体不锈钢和工具钢材料上对该技术与离子氮化和在相同条件下高能离子注入技术作了比较。显微结构分析及摩擦学性能评价表明,三种技术可以产生差不多相同的显微结构,但低能离子注入层由于具有较高的氮浓度和较深的扩散层而显示了较高的耐磨性。本文提出了一个物理模型来表示这种现象的机理。高电流密度是形成较深氮化层的主要原因,而离子能量具有次要作用,只要它能克服表面障碍,去除原有的氧化层,防止表面氧化,并在表面上建立起较高的氮浓度就可促进随后的快速扩散。对该技术的应用与限制也进行了论述。
High-temperature, low-energy, high-current density ion implantation has shown to significantly improve the tribological properties of various materials. This paper reviews some of the findings in this field and compares this technique with ion nitriding and high-energy ion implantation under the same conditions on austenitic stainless steels and tool steels. Microstructural analysis and evaluation of tribological properties show that the three techniques produce nearly identical microstructures, but the low energy ion implanted layer shows higher wear resistance due to its higher nitrogen concentration and deeper diffusion layers . This paper presents a physical model to represent the mechanism of this phenomenon. High current densities are the main reason for the formation of deeper nitrides, and ion energy has a secondary effect as long as it overcomes surface obstructions, removes the original oxide layer, prevents surface oxidation, and establishes a higher nitrogen Concentration can promote the subsequent rapid proliferation. The application and limitations of this technology are also discussed.