# Experimental analysis of PTFE and PTFE/PEEK composites for ball bearing applications

## TL;DR

This study tests PTFE and PTFE/PEEK composites for use in ball bearings, finding that only the composite works for low-load and low-speed applications.

## Contribution

The study experimentally evaluates PTFE/PEEK composites for ball bearings, a use not previously well understood.

## Key findings

- Pure PTFE is unsuitable for ball-bearing applications due to poor wear resistance.
- PTFE filled with 15% PEEK shows potential for low-load and low-RPM ball-bearing applications.
- Ball bearings with silicon nitride balls and PEEK-filled PTFE passed rolling contact fatigue tests.

## Abstract

Polytetrafluoroethylene (PTFE) composites are extensively utilized in tribological applications. In bearing applications, they have found use in journal bearings, bearing pads, lubricants, and other related contexts. However, the applicability of PTFE in ball-bearing systems has yet to be thoroughly investigated. This article begins by examining the wear behaviour of both pure PTFE and 15% PEEK-filled PTFE through ball-on-disc tests using silicon nitride balls. Subsequently, ball bearings incorporating silicon nitride balls were fabricated and subjected to free run and rolling contact fatigue tests. The findings indicate that pure PTFE is unsuitable for ball-bearing applications, whereas PEEK-filled PTFE may be viable for low-load and low-RPM applications.