Abstract
Due to excellent material properties, coatings based on high-temperature resisting thermoplastic polymers like PEEK (polyether ether ketone) represent a promising alternative to conventional tribological coatings based on sliding lacquer. Since the conventional, oven-based coating process requires heating the entire component above the melting temperature of PEEK (approx. 340°C), it is not suitable for temperature-sensitive base materials (e.g. aluminum alloy AlMgSi1). Hence, with the objective of significantly reducing the thermal load of the workpiece and enhancing the process energy efficiency, a laser-based coating process is investigated by the authors. The current research is primarily focused on the process development for the two laser-based process steps. Firstly, the influence of a laser pre-treatment on the surface topography and the adhesion of the PEEK coating is investigated. Secondly, the laser-based coating process is evaluated with regard to the relative density of the coating. As a result, dense and adherent tribological coatings can be applied on aluminum substrates. The adherence is significantly increased by a laser-based pre-treatment of the substrates. The minimal interaction time for generating dense coatings is approximately 7s which represents a decrease by a factor of >100 in comparison to oven processing.
Highlights
High-temperature resistant thermoplastics like polyether ether ketone (PEEK) are, in addition to the outstanding temperature resistance, characterized by a low coefficient of friction, self-lubricating properties and an extensive chemical resistance [1]
Due to excellent material properties, coatings based on high-temperature resisting thermoplastic polymers like PEEK represent a promising alternative to conventional tribological coatings based on sliding lacquer
Oven-based coating process requires heating the entire component above the melting temperature of PEEK, it is not suitable for temperature-sensitive base materials
Summary
High-temperature resistant thermoplastics like polyether ether ketone (PEEK) are, in addition to the outstanding temperature resistance, characterized by a low coefficient of friction, self-lubricating properties and an extensive chemical resistance [1]. The material is suitable for applications affected by friction and wear stress. This includes tribological coatings for metallic components. Due to excellent dry-running properties, these coatings are exceptionally appropriate for components operated in the mixed friction range [2]. PEEK powder is deposited onto the component by means of spray coating as a hydrous dispersion or by means of electrostatic powder coating. The PEEK layer consolidates into a dense and adherent coating. Typical holding times range from a few ten minutes to several hours
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
