Investigated Of The Tribological Behavior Of Surface Treated Nano-Al₂O₃ Filled PTFE Composites

PTFE has many excellent properties such as: bonzer self-lubrication^ low fricatiom chemistry stabilization and thermal stabilization, but its wear resistance is very low to improve the wear resistance of PTFE a lot of researches have been down by means of adding fillers to it , there are still less report on nano-inorganic filler filled PTFE composites to change properties .In this paper, experimental study was made to question above problem. The dry sliding wear properties of PTFE composites filled with surface treated and untreated nano-AlaOa were tested on the model MM-200 tester , the effects of filled nano-AbOs content >. load and sliding speed on the wear mass lose were evaluated .At the same time, In order to estimate the role of different surface treatments on nano-inorganic filler and PTFE composites, PTFE composites filled with surface untreated nano-AliOs were prepared as antithesis at the same condition. Scanning Electron Microscopy(SEM) was employed to examine the worn surfaces^ shape of wear debris ^ dispersion of nano- A^Os and wear mechanism. The results indicate that the friction coefficient of PTFE composites increase slightly, but wear mass loss decrease significantly and then the wear resistance of PTFE composites filled with surface treated nano- A^Oj in low content(<4%) increased by 3-4 times compared with PTFE. Surface treated of nano- A^Oj could disperse proportionately in PTFE matrix when coupling agent presented the wear resistance of PTFE composites filled with modified nano- A^Os . the wear mass loss of is the smallest . the main factors effecting on the abrasive wear of PTFE composites are abrasive size and load, velocity seems has little relation with the wear behavior of the samples. The main wear mechanism is cutting and adhering.