Synthesis of CdS Nanoparticles and the Effect of their Addition on the Tribological Behavior of Bonded PTFE Solid Lubricant Coating

CdS nanoparticles modified by N, N-dioctyldithiocarbamate were prepared by liquid phase precipitation method, and were characterized by fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. An MHK-500A ring-block friction-wear tester was employed to investigate the effects of CdS nanoparticles contents and lubricating conditions on tribological properties of the PTFE based bonded solid lubricant coating. The results indicate that CdS nanoparticles were uniform, and the grain size was 2030nm. The lubricant coatings filled with CdS nanoparticles showed better tribological properties than the original coating under dry friction. Moreover, the coating with 5% CdS nanoparticles showed the best tribological properties. The average friction coefficient and wear lifetime were 0.256 and 490 m/μm, respectively. Compared to that under dry friction, the solid lubricant coating presented lower friction coefficient, longer wear lifetime and a load-carrying capacity of at least 1000 N under RP-3 aviation kerosene lubrication.