Carbon nanotubes (CNTs) are attracting much interest as fibrous materials for reinforcing metal matrix composites due to their remarkable properties such as very high strength, elastic modulus, flexibility and high aspect ratios. However, due to the intricate entanglements of long and fine CNTs and resulting aggregation, disentanglement and uniform dispersion of CNTs in aluminium (Al) matrices have been found quite difficult. In addition, the poor wetting property of carbon for Al has been a great obstacle to forming composites. On a totally new principle, we succeeded in producing nano-scale composites in which carbon nanotubes were uniformly dispersed in Al matrices. We named this method Nano-Scale Dispersion (NSD) method, which can also be employed to disperse various fillers such as whiskers, ceramic fibres, and powders in metal matrices as well as Al. The composites obtained were found to be highly reinforced and not to melt at a temperature far above the melting point of Al. Here we report the procedure of their fabrication and mechanical properties.
We prepared poly(styrene-b-butadiene-b-styrene) (SBS) matrix composites in which multiwalled carbon nanotubes (MWCNTs) were homogeneously dispersed, and their morphologies, thermal properties, and mechanical properties were investigated. The incorporation of MWCNTs into the SBS matrices improved their thermal and mechanical properties with appropriate flexibility. The MWCNT/SBS composites did not flow above 100 °C, and showed surprising improvements in terms of their creep properties. The results indicated the possibility of broadening their use in high temperature applications, and of significantly improving permanent strain, which are currently the main demerits of TPE. These drastic improvements in the various properties of MWCNT/SBS composites were assumed to have been caused by the formation of a three-dimensional structure at the interfacial phase of the SBS matrix along the MWCNTs, which we designated as a “cell structure”.
Using a slider-on-disk type wear tester, the friction and wear the need to eliminate asbestos and the conversion of heavy characteristics of aramidfiber-reinforced brake pads were studied. cars to energy-efficient small vehicles ( 4 ) . The main purpose ,rxbeliments showed that a tenfold decrease in the wear rate and of the addition of fibers such as asbestos is increased strength .I a halving of the f~c t i o n coefficient were achieved by the addition (5)7 and has good tribO1Ogical properties (6), (8)* of aramidfrbers, T o clamyy the role of aramidfibers, the analysis wear resistance and strength. In addition, the cost is very low. It was not simple of the worn surfaces of pads and dish and wear particles was done to find a replacement for asbestos (3). wing SEM and their compositions were analyzed using EPMA.Since aramid fibers exhibit significant strength and therThese analyses showed that a strong transferfilm, which was formed mal stability and do not require major modification in the the addition ' f aramid fibers, played an inlportant in the manufacturing process for asbestos-reinforced composites wear process.(9), aramid fibers are widely used as the replacement for asbestos, although they are very expensive. The friction
KEY WORDScharacteristics of an aramid fiber composite were extensively investigated by Briscoe et al. (9), and they estimated Composite Materials, FRM, Transfer Film, Dry Friction the load index appearing in the relation F = kwn where
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