Effect of graphite content on the antifriction properties of metallographite materials
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Metallographite materials containing not more than 50 vol.% graphite can be used for rubbing-friction applications at high velocities in conditions of limited lubrication. Further increase in the graphite content sharply reduces the strength of the material.
With increase in the friction rate and loading, the coefficient of friction diminishes. This tendency occurs with increase in the graphite content in the structure, when a reduction in the strength of the material contributes to an increase in the wear and the growth in friction coefficient owing to the development of dispersion in the material being rubbed.
The metallographite materials investigated, containing graphite in the range 50–90 vol.% under dry friction conditions,have a high coefficient of friction (of the order of 0.22–0.40) which means that they cannot be recommended as antifriction materials.
In the case of operation with lubricant the metallographite materials can operate as antifriction materials with friction coefficients of 0.03–0.06 at velocities of up to 50 m/sec and with loads of up to 3.3–3.8 kgm/cm2 · sec (PV=165–195 kgm/cm2 · sec).
KeywordsGraphite Friction Coefficient High Velocity Friction Condition High Coefficient
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