Synergistic effect of surface modification of carbon fabrics and multiwall carbon nanotube incorporation for improving tribological properties of carbon fabrics/resin composites

Abstract

Surface modification of carbon fabrics (CFs) by nitric acid and multiwall carbon nanotube (MWCNT) incorporation into the resin matrix were simultaneously applied for CFs/resin composites to improve their tribological properties. The results show that surface roughness (Ra) of CFs increases from 8.20 to 15.10 nm after nitric acid treatment due to the remove of sizing agent on CFs surface. Surface hardness of the composites with 0.1 wt% MWCNT (CFR‐H‐0.1%T) is enhanced from 0.745 to 1.216 GPa compared with that of untreated CFs/phenolic resin composites (CFR), which is attributed to the toughening effect of MWCNT in resin matrix. The friction coefficient increases from 0.10 for CFR to 0.16 for CFR‐H‐0.1%T, while the wear rate significantly decreases from 5.75 × 10−14 m3 (N m)−1 to 2.05 × 10−14 m3 (N m)−1. The improvement of friction and wear properties is ascribed to the synergistic effect of the oxidation etching of nitric acid and the strengthening and toughening of MWCNT.

Experimental investigations of spontaneous damage to wet multi-plate clutches with carbon friction linings

“…Wu [15] and Zhang [16] describe a strong dependence of the coefficient of friction on the resin type. Numerous publications report an increase in the wear resistance [17,18] and the coefficient of friction [18] of Carbon friction linings by introducing nanotubes into the resin material. The dynamic friction coefficient, friction stability, braking stability, thermal stability and wear resistance of the specimens with nanotubes are better than the specimens without nanotubes [19,20].…”

Electromagnetic shielding effectiveness improvement with high temperature in far‐field behavior multiwall carbon nanotube/iron (III) particles addition in composites

“…The combined form of magnetic and conductive particles additions could be better blocking elements in polymer matrix. [ 5 ] The magnetic particles may block the magnetic component and conductive particles may block the electric component of the incoming waves. The multiwall carbon nanotube MWCNT and Iron (III) oxide could be selected as reinforcing materials since they have excellent magnetic and conduction properties.…”

“…The multiwall carbon nanotube MWCNT and Iron (III) oxide could be selected as reinforcing materials since they have excellent magnetic and conduction properties. [ 5 ] Several authors concluded that the additions of compound particles of Cu‐Magnetite blend in to epoxy resin improved the microwave attenuation behavior of epoxy shield up to 38 dB. They have produced the compound form of particles by ball milling the particles up to 8 hours.…”

“…The semi‐conductive MWCNTs observed most of the incoming microwaves and attenuate them by absorbing the incident wave. [ 5 ] Also, many researchers have presented their ideas to improve the shielding efficiency in rubbers and polymers. By comparing the materials, the polymer matrix could be more suitable matrix medium since it may have high versatile nature.…”

A novel processing technique of carbon fiber/copper wire reinforced thermoplastic composites to improve EMI SE performance

“…However, the metal cases also need treatments of corrosion proof and baking enamel, which would increase the weight of the products. [26][27][28][29] Carbon fibers are prone to be hairy due to its poor shear strength during the weaving process and thus led to a failure product. Hence, in order to solve the hairy problem of carbon fibers, polypropylene is melt and coated on the surface layer of carbon/copper/polyester yarn by melting process, and form a double-layered structure.…”