The wear and friction behavior of PEEK composites containing copper compounds and PTFE
Date
1993
Authors
Vande Voort, Jeffrey Lee
Major Professor
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Bahadur, Shyam
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Abstract
This work was done in part as a follow up of an earlier study which showed that CuO was very effective in reducing the wear of PEEK, but the coefficient of friction of PEEK was found to increase with the addition of CuO. In this study, the optimum CuO proportion for minimum wear was determined and the coefficient of friction behavior was modified with the addition of PTFE. The friction and wear behaviors of these composites sliding against a tool steel surface were studied in a pin-on-disk configuration. It was determined from experiment that the optimum filler proportion of CuO in PEEK for minimum wear rate was 35 vol%, but its coefficient of friction was considerably higher than that of PEEK. The wear rate and the coefficient of friction of PEEK - 30% CuO - 5% PTFE were both found to be lower than those of PEEK. The wear behavior has been studied in terms of the ability of these composites to form a transfer film on the steel counterface and the bonding of this film to the steel surface has been investigated by XPS analysis. The XPS results revealed the presence of Cu ions and FeF₂ compounds near the interface of the transfer film and the steel substrate. These observations have been used to support the hypothesis that fillers enhance the adhesion between the transfer film and the counterface.
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