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

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.