Abstract
The friction and wear properties of pure and bronze filled polyacetals (POM) have been studied sliding against a carbon steel surface (slider) under unlubricated conditions. Spherical, irregular and waterdroplike particles of 53 μm and below were used as the fillers. The electron microscopic examination of the frictional surfaces was used to evaluate the role of the filler materials. The results obtained were as follows : (1) The coefficient of friction of bronze filled POM was slightly higher than that of pure POM. The wear of bronze filled POM was approximately one half of that of pure POM. Waterdroplike bronze filled POM had the best wear resistance of all specimens at high pressure and velocity. (2) Owing to the effect of fillers, the pv limit of bronze filled POM was remarkably improved. The pv limit of waterdroplike bronze filled POM was approximately three times higher than that of pure POM. (3) Waterdroplike particles showed the best effect of increasing the load-supporting action of all filler shapes.
