Papers by Author: Chi Lan Cai

Abstract: Reinforced polyimide composite with of carbon fiber and carbon nanotube were prepared by hot molding technology. The mechanical and friction and wear behaviors of the reinforced composites were studied. Tensile tests showed that SCF and CNT exhibit a beneficial effect for restoring the stiffness of the CF/PI composite. The carbon fiber reinforcement was found effective in reducing the coefficient of friction and the wear rate. This implied that the CNT improves the adhesion between SCF and PI.

Abstract: PEI composites filled with glass and carbon fiber was synthesized. The aim of the research article is to study the mechanical and two-body abrasive wear behaviour of glass/carbon fiber reinforced PEI composites. The microstructure of the composite was examined by scanning electron microscopy. The results showed that the highest specific wear rate was for glass fiber reinforced PEI composite was higher than that of carbon fiber reinforced PEI composite.

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 aim of this work is the evaluation of the effects of PA6 content on the friction andwear properties of POM composite system. Friction andwear properties of PA6/POM composite were determined with the help of pin-on-disc tribometer in sliding contact with a steel-ball at room temperature without lubrication. The spectroscopic investigations reveal that the increasing concentration of PA6 has a drastic influence on crosslinking efficiency due to their interference with POM in curing process. As a result, POM filled PA6 with higher concentration showed remarkably enhanced friction and wear properties.

Abstract: The present study establishes the relationships between the carbon fibers (CF) content and the trbological properties of Polyether ether ketone (PEEK) composite. PEEK composites such as unreinforced PEEK, reinforced PEEK with different content of carbon fibres were used for the tribological tests. The results indicated that CF/PEEK composite had better tribological properties than pure PEEK. Some CF was ground and squeezed, then mixed with debris on the worn surface, which improved the wear resistance greatly. The low friction coefficient of CF/PEEK composite caused little change in the temperature and further ensured the stable state of sliding.

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: The sliding wear behavior of polyamide6/ultrahigh molecular weight polyethylene (PA6/UHMWPE, 90/10) blends loaded with 20 % carbon short fibers (CSF) as reinforcement and varying amounts of nanoclay filled nanocomposites were reported. Sliding wear loss, specific wear rate and coefficient of friction were investigated. 3 % nano clay filled composite exhibits better wear behaviour. Morphological study was evaluated for wear out surfaces of the composites using scanning electron microscopy.