Comparison and Analysis on Mechanical Property and Machinability about Polyetheretherketone and Carbon-Fibers Reinforced Polyetheretherketone.

Shijun Ji,Changrui Sun,Fusheng Liang,Ji Zhao

doi:10.3390/ma8074118

Abstract

The aim of this paper is to compare the mechanical property and machinability of Polyetheretherketone (PEEK) and 30 wt% carbon-fibers reinforced Polyetheretherketone (PEEK CF 30). The method of nano-indentation is used to investigate the microscopic mechanical property. The evolution of load with displacement, Young’s modulus curves and hardness curves are analyzed. The results illustrate that the load-displacement curves of PEEK present better uniformity, and the variation of Young’s modulus and hardness of PEEK both change smaller at the experimental depth. The machinability between PEEK and PEEK CF 30 are also compared by the method of single-point diamond turning (SPDT), and the peak-to-valley value (PV) and surface roughness (Ra) are obtained to evaluate machinability of the materials after machining. The machining results show that PEEK has smaller PV and Ra, which means PEEK has superior machinability.

Highlights

Polyetheretherketone (PEEK) materials belong to a group of high-performance thermoplastic polymers [1]
The evolutions of load with displacement are obtained to analyze the mechanical property, and form accuracy and surface roughness are used to evaluate the machinability of the materials
This investigation leads to the following conclusions: (1) The load-displacement curves of pure PEEK show superior uniformity at different nano-indentation depth, but the curves of PEEK Carbon fiber (CF) 30 show poor repeatability and consistency

Summary

Introduction

Polyetheretherketone (PEEK) materials belong to a group of high-performance thermoplastic polymers [1]. Materials 2015, 8 used in tribological components because of its excellent performance such as high mechanical properties, good wear-resistance and heat-resistance, and excellent chemical resistance, etc. Carbon fiber (CF) is a widely-used filler because of its excellent performance such as high strength and modulus, low thermal expansion, good creep-resistance and corrosion-resistance, etc. Carbon Fiber Reinforced Plastics (CFRPs) are gaining wide acceptance in the aeronautic sector, for the excellent strength to weight ratio offered by the laminates. CF/PEEK laminates show a useful increasement in service temperature since the thermoplastic matrix offers excellent mechanical and chemical resistance and keeps these properties up to remarkably high service temperature [1,18].

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Results

Conclusion