中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心知识库

The polyurethane acrylate resin-polytetrafluoroethylene (denoted as PUA/PTFE) bonded solid lubricating coatings with good tribological properties were prepared by ultraviolet radiation curing (UV curing), and then nano-LaF3 and micro-LaF3 were incorporated to further improve the tribological properties of the lubricating coatings. The photopolymerization reaction of the lubricating coating binder was characterized by an attenuated total reflection Fourier transform infrared spectrometer (ATR-FTIR). A micro-hardness tester was used to evaluate micro-hardness and a CSM friction and wear tester was selected to investigate the tribological properties of the lubricating coatings under dry friction condition. The coating surfaces and worn surfaces topography,
as well as the distribution of La elements, were observed with a scanning electron microscope equipped with an energy dispersive X-ray spectrometer. Results show that the final conversion of acrylic double bond reached 98.4%, and the lubricating coating showed the best adhesive strength, micro-hardness and tribological properties when the mass ratio of PTFE to the binder was 1. Moreover, the incorporation of nano-LaF3 or micro-LaF3 both effectively enhanced the micro-hardness and the wear resistance of the PUA/PTFE lubricating coatings. Furthermore, nano-LaF3 was superior to micro-LaF3 for the improvement of anti-wear performance. The main wear mechanism of the UV curing PUA/PTFE lubricating coatings was dominated by fatigue wear.