Critical Review of Reinforcement Effect in PEEK Tribology and Its Usage in Biomedical, Coating and Bearing Applications

Polyetheretherketone (PEEK) is an ultra-high-performance polymer renowned for its excellent wear resistance, making it widely used in tribological applications. However, its high coefficient of friction (COF) can detract from its performance. Reinforcing appropriate filler materials can significantly enhance its tribological properties, making it suitable for biomedical, coatings, and bearing applications. The review’s focus is to provide a detailed understanding of the role of reinforcement in affecting the PEEK tribology, covering different forms of reinforcement from fiber to nanofiller in single or hybrid forms. Moreover, the article develops into the testing conditions that can influence its performance, which include material modification, environmental conditions, lubrication state and testing parameters like load, velocity, etc. Further, an in-depth discussion is provided about the role of reinforcement in PEEK usage in biomedical, bearing and coating applications. This article’s effort provides the researchers with scientific knowledge of the reinforcement role in PEEK tribology and major application usage. Further, it offers different areas where there is scope for improvement.