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Abstract
The ‘pin and disc’ method has been used to measure the coefficient of friction for the following lubricants: aluminium, calcium, lithium, zinc stearates, and stearic acid. The variation of the coefficient of friction at the surface of iron compacts has been studied with respect to metal/metal contacts exposed through the lubricant film and the behaviour of the lubricant film with variations of pressures, temperature, and speed of sliding has been related to the variation in coefficient of friction for the system.
The results for a range of zinc stearates are compared with those for other stearates for reduced iron powder compacts sliding against high-chromium die-steel.
Notes
* Manuscript received 15 May 1974. Contribution to a Symposium on ‘Factors Affecting the Uses of PM Products’, to be held in Eastbourne on 28–30 October 1974.