合金成分和石墨形貌对镍-铁-石墨-硅合金摩擦磨损性能的影响

Effects of Alloy Composition and Graphite Morphology on Friction and Wear Properties of Nickel-Iron-Graphite-Silicon Alloys

采用中频感应炉在氩气保护下熔炼制备出不同成分的镍-铁-石墨-硅合金自润滑材料,通过摩擦磨损试验,研究了石墨形貌和合金成分对其摩擦磨损性能的影响。结果表明:在干摩擦和油润滑两种摩擦磨损条件下,材料的摩擦因数均与石墨的面密度相关,石墨的面密度越大,摩擦因数越小,而与石墨的形貌和铁含量无关;材料的磨损率随着材料硬度值的增大而减小,石墨球化后和合金中铁含量的增加均使合金的磨损率大为降低。

Nickel-iron-graphite-silicon self-lubricating materials with different compositions were prepared using medium frequency induction furnace by melting method with argon shield.The effects of graphite morphology and alloy composition on the friction and wear properties were studied.The results show that under two friction and wear conditions including dry friction and oil lubrication,both friction coefficients were related with the graphite area density but no relation with the graplite morphology and iron content.The larger the graphite area density,the smaller the friction coefficient.The wear rate of the material reduced with increasing hardness.Both the graphite spheroidization and the increase of iron content reduced the wear rate of the alloy.