High temperature tribological properties of polybenzimidazole (PBI)

POLYMER

卷:128

Article

Jean-Fulcrand, Annelise¹  Masen, Marc A.¹  Bremner, Tim²  Wong, Janet S. S.¹ 

[1] Imperial Coll London, Dept Mech Engn, Tribol Grp, Exhibit Rd, London SW7 2AZ, England

[2] America Inc, Hoerbiger Corp, Houston, TX USA

关键词: Polybenzimidazole;    High temperature;    Contact temperature;    Wear;    Transfer layer;   

DOI  :  10.1016/j.polymer.2017.09.026

来源: Elsevier

【 摘 要 】

Polybenzimidazole (PBI) is a high performance polymer that can potentially replace metal components in some high temperature conditions where lubrication is challenging or impossible. Yet most characterisations so far have been conducted at relatively low temperatures. In this work, the tribological properties of PBI were examined with a steel ball-PBI disc contact at 280 degrees C under high load and high sliding speed conditions. The dry friction coefficient is relatively low and decreases modestly with increasing applied load. Surface analysis shows that PBI transfer layers are responsible for the low friction observed. In-situ contact temperature measurements were performed to provide for the first time direct links between the morphology and distribution of the transfer layer, and the temperature distribution in the contact. The results show that high pressure and high temperature in heavily loaded contacts promote the removal and the subsequent regeneration of a transfer layer, resulting in a very thin transfer layer on the steel counterface. FeOOH is formed in the contact at high loads, instead of Fe2O3. This may affect the adhesion between PBI and the counterface and thus influence the transfer layer formation process. To control PBI wear, contact temperature management will be crucial. (C) 2017 The Authors. Published by Elsevier Ltd.

【 授权许可】

Free