The load-carrying capacity of sintered iron/graphite composites is increased by alloying with copper and zinc sulfide. The seizure pressure is increased from 5 to 50–60 kg/cm2, the friction is stabilized and there is a 4–5 fold reduction in friction coefficient.
Iron-base compositions containing 1.5% graphite, 2% copper and 8–10% zinc sulfide may be recommended for service under dry friction conditions in contact with steel 45.
The results of examination of the friction surfaces on a fluorescent microscope indicate that the reduced wear and friction coefficients of materials containing zinc sulfide is attributable to the formation of a surface sulfide film.
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Fedorchenko, I.M., Filatova, N.A., Klimenko, A.V. et al. Antifriction properties of iron-base sintered materials in dry friction. Mater Sci 2, 395–397 (1968). https://doi.org/10.1007/BF00714868
- Friction Coefficient