纳米TiO2填充聚醚砜酮复合材料的摩擦学性能

采用热压成型的方法制备了纳米TiO2填充聚醚砜酮(PPESK)复合材料，在MM—2000摩擦磨损试验机上考察了干摩擦条件下纳米TiO2含量以及试验载荷对复合材料摩擦磨损性能的影响，并利用扫描电子显微镜(SEM)观察分析PPESK及纳米TiO2／PPESK复合材料磨损表面形貌及磨损机理。结果表明，添加少量纳米TiO2即可以明显提高PPESK的耐磨性，当纳米TiO2含量超过2．5％(体积)时，其耐磨性随填料含量变化不明显，载荷对纳米TiO2填充PPESK复合材料磨损率的影响不大。在低含量时(＜2．5％)，纳米TiO2具有减摩效果，高含量时反而比未填充时大；随量载荷的增加，填充PPESK的摩擦系数显著降低。

FRICTION AND WEAR PROPERTIES OF NANOMETER TiO2 PARTICLE-FILLED POLY(PHTHALAZINE ETHER SULFONE KETONE) COMPOSITES

The dry sliding friction and wear properties of nanometer TiO 2 particle filled poly(phthalazine ether sulfone ketone) (PPESK) composites were investigated with an MM 2000 tester by sliding PPESK based composites against plain carbon steel(AISI1045) ring, with an emphasis on exploring the effect of the filler content and applied loads on the tribological behaviors of the composites. The morphologies of the worn composite surfaces, the wear debris, and the transfer films were examined with SEM. It has been found that the nanometer TiO 2 particle could considerably increase the wear resistance of PPESK at a filler content below 1.75 vol.% , while too high filler content corresponds to slight effect on the wear rate of the composites. Nanometer TiO 2 has good friction reduction at a filler content below 2.5 vol.% , while too high filler content corresponds to higher friction coefficient. The wear rate of the PPESK composites is less sensitive to the applied load while the friction coefficient decreases greatly with the increase of the applied load.