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Pressure-velocity limit evaluation on POM-C + carbon black at different temperatures

2020; Elsevier BV; Volume: 464-465; Linguagem: Inglês

10.1016/j.wear.2020.203530

1873-2577

Gustavo da Silva Gehlen, Patric Daniel Neis, Jean Carlos Poletto, L.Y. Barros, Diogo Buneder, Ney Francisco Ferreira,

Natural Fiber Reinforced Composites

The present study examined the effect of temperature on Pressure-Velocity Limit (PVL) of a commercial polyacetal (POM-C) with carbon black.The polymer was rubbed against a gray cast iron counterpart (disc) through a pin-on-disc tribometer.The operating parameters of the wear tests included a fixed constant load, 3 different temperatures (30, 55 and 85 • C), and sliding velocities (v) varying from 1.2 to 2.0 m/s.At 30 • C, the PVL was 2.04 MPa m s -1 (at 1.8 m/s).At 55 • C, two distinct PVLs were identified: PVL 1 = 2.04 MPa m s -1 (v = 1.8 m/s) and PVL 2 = 2.26 MPa m s -1 (v = 2.0 m/s).Between the PVL 1 and PVL 2 at v = 1.9 m/s, the wear regime was mild due to the presence of a protective and uniform tribofilm on the surface of the disc.At 85 • C, no PVL was reached.The higher temperature of the tests softened the polymer in this case, easing its adhesion on the disc's surface.This in turn contributed to form a uniform and continuous tribofilm over the disc's surface, preventing the PVL and severe wear regime to occur.The wear mechanisms involved in the tests are described and discussed throughout the paper.