氮化处理粉末烧结材料耐磨性研究

Investigation of Wear Behavior on Nitriding Sinter Metal Materials

利用 MM 2 0 0磨损试验机研究了气体氮碳共渗和离子氮化处理铁基粉末烧结材料的氮化层对其磨损特性的影响 ,同时对其磨损机理进行了分析。研究结果表明 :气体氮碳共渗和离子氮化处理改善了铁基粉末冶金材料的耐磨性 ,提高了磨损过程中的承载能力 ,离子氮化粉末冶金材料比气体氮碳共渗的粉末冶金材料具有更好的耐滑动磨损性能 ;氮碳共渗的粉末冶金试样在低于 2 0 0 N载荷时主要为氧化磨损 ,在高于 2 0 0 N载荷时为剥层磨损 ,离子氮化处理的铁基粉末冶金材料在给定试验条件下主要为氧化磨损。

The more and more ferrous powder metallurgy materials are used in manufacturing structure components, such as gears, cam shafts and bears, because powder metallurgy(PM) has distinct advantages in cost and machining. Three kinds of ferrous PM materials were prepared and handled by the process of ion nitriding and nitrocarburizing. The effect of ferrous powder materials by plasma nitriding or gas nitrocarburizing process on wears resistance and mechanism was studied using an MM200 wear tester. The results show that nitriding process improves wear properties and carrying capacity of the materials after nitrided processed considerably. The sliding wear resistant of the materials after the plasma nitriding is better than that after the nitrocarburizing. The wear mechanism of nitrocarburizing ferrous powder material is oxidation dominated under 200 N normal force, and is delamination dominated beyond 200 N normal force. The wear mechanism of plasma nitriding ferrous powder metallurgy materials is oxidation dominated wear throughout the given test regions.