Research on the tribological performance of Cr2O3 filled with bronze‐based PTFE composites. Issue 22 (27th June 2014)

• Record Type: Journal Article
• Authors: Ye, Sujuan; Zeng, Xingrong; Tan, Feng; Fan, Qing
• Is Part Of: Journal of applied polymer science. Volume 131:Issue 22(2014:Nov. 15)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2014-06-27
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.41117
• Languages: English
• ISSNs: 0021-8995

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>Enhancement of the wear resistance of bronze‐filled polytetrafluoroethylene (PTFE) composites has been achieved using various fillers, for example, chromic oxide (Cr<sub>2</sub>O<sub>3</sub>), molybdenum disulfide (MoS<sub>2</sub>), graphite, and nanometer aluminum oxide (n‐Al<sub>2</sub>O<sub>3</sub>), in the present study. The wear resistance was evaluated by a block‐on‐ring wear tester, and the effects of fillers on the wear resistance as well as the mechanism were investigated. The wear rate for the composite where the recipe containing 59% PTFE + 40% bronze + 1% Cr<sub>2</sub>O<sub>3</sub> was 0.5 × 10<sup>−5</sup> mm<sup>−3</sup>/N m and for the composite in the recipe containing 60% PTFE + 40% bronze was 4.2 × 10<sup>−5</sup> mm<sup>−3</sup>/N m, which meant that that Cr<sub>2</sub>O<sub>3</sub> increased the wear resistance by approximately 10 times. The differential scanning calorimetry measure analysis showed that Cr<sub>2</sub>O<sub>3</sub> had a positive effect on the crystallization of PTFE; the crystallinity of PTFE composites increased from 45% to 52%, which exhibited improved wear resistance. Wear testing and scanning electron microscope analysis had shown that Cr<sub>2</sub>O<sub>3</sub> had a positive effect on the formation of transfer film and keeping it stable to exhibit improved wear resistance. X‐ray photoelectron spectroscopy results also showed that Cr<sub>2</sub>O<sub>3</sub> was effective in tribochemical reactions during sliding against stainless ring; these maybe responsible for forming transfer film and lowering wear rate of composite. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. <bold>2014</bold>, <italic>131</italic>, 41117.</p> </abstract>