Abstract
A fundamental experiment on the development of polymer-based composite materials having a low friction coefficient and wear-resistance has been carried out. Chopped fiber of polyaramid (aromatic polyamide: Kevlar) was employed as the filler and mixed with fine powder of poly-tetra-fluoro-ethylene (PTFE) using a high-speed mixer. The critical pressure Pc, defined as the value at the point of unchanged bulk density, before and after the sintering process, was introduced as an index for the optimal preforming pressure. The relationship between Pc and the concentration of the fiber was expressed as a simple experimental equation. It was shown that the testpiece with a riber content of 14.9vol% preformed at the critical pressure Pc indicated a high modulus of elasticity, fracture energy and strong wearing resistance.
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