Preparation And Study On The Tribologyand Anti-corrosion Performance Of Polymer Matrix Composite Materials

At present, many components in petroleum and chemical industry are made of metallic alloys, which are easily to corrode and wear. Polymer composites not only have well mechanical property, but also own good chemical stability and easy forming process. Therefore the composite is a good choice to instead of the metal materials. In order to meet the requirements in the harsh conditions, this article used fibers and nano particles as the fillers, and study the composites wear resistance and anti-corrosion property. The main contents and conclusions are summarized as follows:1. Using the method of VARI technologies prepared the CF/EP composite. The tribological behaviors of the epoxy(EP) composite reinforced by carbon fiber(CF) after immersing in the 10 wt. % sulfuric acid solutions for 7, 15, 30 and 60 days were investigated by using the tribological tester with a pin-on-disk configuration. Simultaneously, it evaluated for tribological property as a function of fiber orientation angle(0o, 45 o and 90o) and the normal orientation. The corrosive tests indicated that the corrosive mass loss rate of CF/EP composite increases with the increased immersed time in the corrosive media. The increase of corrosive rate was small, which due to epoxy resin wrapped CF completely and the CF tightly stacked in the composite. The wear tests revealed that CF orientations have significant effects on the tribological properties, CF reinforcement in 45 o orientation showed the lowest friction coefficient and CF in antiparallel orientation obtained the best improvement of wear resistance. It indicated that the CF orientations have effects on the tribological properties. SEM observations revealed an abrasive wear behavior for CF/EP composite. The phenomenons of composite include wear thinning and debond of the fiber from matrix with CF in parallel to antiparallel orientation. The abrasive wear behavior of CF in normal orientation owned to the broken fracture CF.2. Using the method of cold molding and high temperature sintering technologies prepared the nano SiC/PEEK composite. The tribological behaviors and corrosion resistance of the PEEK composites filled with various amount of modified nano SiC under the 10 wt.% sulfuric acid solution and dry sliding conditions were investigated. The mechanisms were discussed by the SEM observation of the worn surface and the optical microscope(OM) of the transfer film. The result indicated that the 2.5 wt.% modified nano SiC showed the best corrosive resistance when the composite conducted corrosive experiment. Under the dry condition, due to the load-bearing and ball-rolling phenomenon of nano SiC, and the degree of the matrix coated nano particle, the composite with 2.5 wt.% modified nano SiC showed the best wear resistance. Under the acid condition, due to the cooling and the lubricating effect of the acid solution, the composite with 1wt.% modified nano SiC showed the best wear resistance, and the wear rate was less than 50% for the pure PEEK under the same condition. The wear rate of composite under the sulfuric acid was 1/3 of that in dry conditions. The wear mechanisms revealed that when the filler content was above 5 wt.% the abrasive wear was the main mechanism.3. Using the method of cold molding and high temperature sintering technologies prepared the nano SiC/CF/PEEK and nano SiC/PTW/PEEK composite. The tribological behaviors and corrosion resistance of the composites filled with various amount of modified nano SiC under the PH=1 sulfuric acid solution. The mechanisms were discussed by the SEM and shore hardness measurement. The wear test showed that because of the synergy of the CF, PTW and nano SiC and the heat conduction of the nano SiC, the 2.5 wt.% modified nano SiC showed the best wear resistance. Due to the strength and heat conduction of the PTW was better than that of the CF. When the content of the filler was same, the tribological performance of the composite which contained the PTW was better than the CF. The wear rate of the PTW composite was 1/6 of that the CF composite. It was found that the adhesion wear at the worn surface of the composite by the SEM. The heat conduction and synergy of the fillers decreased the level of the plough, and increased the wear resistance of the composite.