【摘要】 采用球磨法成功制备了纳米蒙脱石(MMT)粉体,并使用KH-550偶联剂对制备的纳米MMT粉体进行表面修饰(K-MMT),结果表明,85%的MMT颗粒粒径在100 nm之内,且修饰的纳米K-MMT在溶液中具有较好的分散性。用纳米K-MMT改性酚醛树脂PF,并制备改性纳米K-MMT增强摩擦试样。热失重测试表明,在300~700℃,未改性的PF与纳米K-MMT改性PF(K-MMT-PF)变化趋势相近;而当温度高于700℃时,K-MMT-PF具有较好的耐热性。摩擦试验结果表明,纳米K-MMT改性PF增强摩擦试样的摩擦因数和磨损率得到了改善,其摩擦机理主要为粘着与疲劳磨损。更多还原

【Abstract】 In this paper, nano-montmorillonite powder(MMT) was prepared with ball-milling method, and then the samples were modified by KH-550 coupling agent. The results showed that the particles diameter within 100 nm was about 85%, and the modified nano-K-MMT had the better dispersion in solution. After that, the PF was further modified by the nano-K-MMT, and the modified PF reinforced composite friction material was prepared. The results of thermogravimetric analysis indicated that the similar change trends existed between 300~700 ℃ for PF and K-MMT-PF. However, the K-MMT-PF had the best heat resistance when the temperature was higher than 700 ℃. In addition, the friction and wear tests results showed that the friction and wear properties of K-MMT-PF had been improved obviously. The friction and wear mechanism of the K-MMT-PF was mainly of adhesion and fatigue wear.更多还原