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PTFE/Kevlar fabric woven liner is the functional part of the spherical plain bearing. Based on the microstructure, physical wear models for the liners with different adhesive contents were established. Based on mesomechanics and volume averaging method, the elastic performances for the liners in main directions during wear process were investigated. Based on mechanics analysis method of composite...
The effects of the rare earth treatment on the friction, wear, and bonding behavior of polymeric, self-lubricating spherical plain bearing materials were investigated. The materials of interest consisted of woven Kevlar (TM) and poly-tetrafluoroethylene (PTFE) fibers. An oscillating wear tester, operating at angles of ±10°, four different frequencies, and a constant load, was used to test assembled...
In the present work, epoxy based quaternary composites were produced by filling lubricant oil-loaded microcapsules, surface grafted nano-SiO 2 and discontinuous carbon fibers. Through orthographic tests, the optimal contents of the fillers were determined for achieving significantly improved tribological properties. The lowest specific wear rate and friction coefficient of the composite can...
In the present work, epoxy based composites filled with hybrid nano-SiO 2 particles and short pitch based carbon fiber were prepared. Copolymer of styrene and maleic anhydride was grafted onto the nanoparticles prior to the compounding so that the nanoparticles can be covalently connected to the composites’ matrix through the reaction between anhydride and epoxide groups during curing. Consequently,...
The heat-transfer capability affects the tribological properties of Ti6Al4V alloys. In present paper the friction and wear behaviours of Ti6Al4V alloys dry sliding against GCr15 steel were investigated on a high-speed pin-on-disc tribometer. Friction and wear tests were carried out at sliding speeds from 30 to 60m/s and at contact pressure ranging from 0.33 to 1.33MPa. In order to change the heat-transfer...
The sliding wear performance of epoxy composites filled with nano-sized Al 2 O 3 particles was studied in the present paper. To enhance the interfacial interaction between the fillers and the matrix polymer, the nanoparticles were pretreated by either silane coupling agent or graft polymerization. The experimental results indicated that the frictional coefficient and wear rate of epoxy...
To prepare epoxy-based composites with low frictional coefficient and high wear resistance, nanometer silicon nitride particles were added. Dry sliding wear tests indicate that the composite materials exhibit significantly improved tribological performance and mechanical properties at rather low filler content (typically less than 1vol.%). Unlike the severe wear observed in unfilled epoxy dominated...
To overcome the disadvantages generated by the loosened nanoparticle agglomerates dispersed in polymer composites, an irradiation grafting method was applied to modify nanosilica by covalently bonding polyacrylamide (PAAM) onto the particles. When the grafted nanosilica was added to epoxy, the curing kinetics of the matrix was accelerated. Moreover, the grafting PAAM can take part in the curing of...
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