Papers by Author: Jian Li

Abstract: PA6 composites filled with nano-SiO₂ were synthesized. The aim of the research article is to study the mechanical and friction and wear behaviour of nano-SiO₂ reinforced PA6 composites. The worn surface of the composite was examined by scanning electron microscopy. The results showed that the addition of nano-SiO₂ can effectively improve the mechancial and tribological properties of the PA6 composites.

Abstract: The friction and wear properties of carbon fibers (CF) reinforced polypropylene (PP) composite were studied. The influences of the fiber volume fraction, load applied, rotating speed, and wear mechanism were discussed. The results indicated that CF/PP composite had better tribological properties than pure PP. The friction coefficient and wear mass loss decreased with the fiber volume fraction increased, but increased as the load and rotating speed increased, respectively. CF reduced direct contact between the matrix and counterpart and improved the wear resistance of CF/PP composite greatly. The wear displayed a linear evolution in all the range of load. Surfaces after wear tests were characterized using scanning electron microscopy (SEM).

Abstract: The effects of PTFE on the tensile and tribological properties of glass fiber reinforced polyamide 6(PA6) composites were studied. Tribological tests were conducted on an M2000 friction and wear tester using a block-on-ring arrangement. It was observed that the PTFE played a main role in the tensile-resistant and wear-resistant properties of the PA6 composites. The tensile properties were ruled by the fiber–matrix adhesion. And the excellent tribological performance of the PTFE fillers improved the tribological properties of PA6 composites.

Abstract: Kevlar pulps were employed as reinforcement for polyetherimide(PEI)composite. All filled and unfilled polyetherimide composites were tested against CGr15 ball and representative testing was performed. The effects of Kevlar content on tribological properties of the PEI composites were investigated. The worn surface morphologies of pure PEI and its composites were examined by scanning electron microscopy (SEM) and the wear mechanisms were discussed. Results show that all filled polyetherimides have superior tribological characteristics to unfilled ones.

Abstract: In this paper, the wear performance of a ultra-high molecular weight polyethylene composites filled with carbon fiber (CF/UHMWPE) were studied using a pin-on-disc method. The effects of surface treatment of CF and sliding load and on the friction and wear of the CF/UHMWPE composite are reported. It was observed that the sliding load is an important controlling factors; its effect is diminished when the CF is modified.

Abstract: Carbon fiber reinforced Ultra High Molecular Weight Polyethylene (CF/UHMWPE) composites have been filled with acid treated carbon nanotube to enhance the tribological properties. According to the modification, the friction and wear properties of composites have been greatly improved. XPS and SEM are used to examine the microscopic properties of resultant composites. The enhanced tribological properties are attributed to the acid treated CNT interlock, which improves the wetting between carbon fibers and resins.