An Approach for Preparation of Excellent Antiwear PTFE Nanocomposites by Filling As-prepared Carbon Nanotubes/Nanorods (CNT/CNR) Mixed Nano-Carbon Material

The one-dimensional carbon nanotubes/nanorods (CNT/CNR) mixed nano-carbon material was successfully prepared by halloysite nanotubes (HNTs) as the template for the first time, in which CNT was formed through PVA modifi-cation in internal surface of HNTs and CNR was obtained by nanocasting PVA in hollow nanostructure of HNTs. The CNT of the mixture with flexible structure has ca. 20 nm in pore diameter and ca. 500 nm in length, whereas the CNR with hard and solid structure shows ca. 30 nm in diameter and ca. 2 μm in length. For application as fillers, the CNT/CNR mixed na-no-material is used to reinforce the properties of polytetrafluoroethylene (PTFE). The mechanical and tribological properties of PTFE nanocomposites were intensively examined by a series of testing. The ring-on-ring counterface was used to eval-uate the tribological behavior of the nanocomposites. The results showed that the volume wear rate of the CNT/CNR-re-inforced PTFE nanocomposite after being filled with 0.3％ of CNT/CNR was only 1/700 of that of the pure PTFE under a load of 200 N and a rotary speed of 200 r/min, while other mechanical and tribological performance was comparable to the performance of pure PTFE, which exhibited a desirable application prospect.