纳米TiO2含量对共混复合酚醛树脂基半金属材料摩擦性能的影响

摘要

The blending composite phenolic resin (PF) was prepared by filling different content of surface modified TiO2 nano-particles.The dispersion of the modified solid-phase nano-particles in PF was characterized by TEM,and the thermal weight loss (TG) of the synthetic resin was analyzed by thermal analyzer.The friction material samples were prepared with the different blending composite PF as resin matrix,and the friction-wear contrast tests were carried on XDMSM fixed speed type friction-wear testing machine.The results show that the heat resistance of blending composite PF can be improved linearly when the mass fraction of TiO2 nano-particles in the range of 1％ ～3％,the carbon residue rate of the blending composite PF with 3％ TiO2 nano-particles is increased by 7％ at 600 ℃,compared with the PF without nano-particles.The friction material samples prepared by the blending composite PF with 3％ TiO2 nano-particles have the best comprehensive properties.The wear rate is clearly decreased by 10％ at high temperature of 350 ℃.%采用表面修饰的纳米TiO2粒子对酚醛树脂(PF)进行复合填充改性,制备共混复合PF,对固相纳米TiO2粒子在PF中的分散性进行TEM表征,采用热分析仪对复合PF进行热失重分析.以复合改性后的PF为树脂基体制备摩擦材料试样,在XD-MSM定速式摩擦磨损试验机上进行摩擦磨损对比试验.结果表明,纳米TiO2质量分数在1％ ～3％范围内复合改性的树脂的残炭率呈线性增加,在600℃时,质量分数为3％复合树脂残炭率较无纳米复合树脂提高7％；纳米TiO2质量分数为3％的复合树脂制备的摩擦试样综合性能最佳,高温磨损率明显下降,在350℃时,磨损率比无纳米TiO2复合树脂的摩擦试样降低10％.