纳米Si_3N_4及其与石墨、MoS_2混合填充PTFE摩擦磨损性能研究  

Friction and Wear Properties of PTFE Composites Filled with Nano-Si_3N_4,Nano-Si_3N_4-graphite or Nano-Si_3N_4-MoS_2

作　　者：何春霞[1] 张静[1] 范正国[1] 史丽萍[1] 路琴[1] 

机构地区：[1]南京农业大学工学院,江苏南京210031

出　　处：《材料科学与工艺》2009年第2期195-198,共4页Materials Science and Technology

基　　金：江苏省自然科学基金项目(BK2004103);江苏省农机基金项目(GXZ04004)

摘　　要：用M-2000型摩擦磨损试验机对纳米Si3N4及其与石墨、MoS2混合填充聚四氟乙烯(PTFE)复合材料在干摩擦条件下与45#钢对磨时摩擦磨损性能进行了研究,用洛氏硬度仪对其进行了测量,用扫描电子显微镜对磨损表面进行了观察.结果表明:纳米Si3N4的加入能提高PTFE复合材料的硬度和耐磨性,纳米Si3N4与MoS2混合填充会使PTFE复合材料的耐磨性能提高更多,特别是在载荷增大时其耐磨效果更好.纳米Si3N4能阻止PTFE复合材料中磨损微裂纹的产生,在纳米Si3N4的富聚区,磨损微裂纹较少,在纳米Si3N4的贫聚区,磨损的微裂纹较多.纳米Si3N4填充PTFE复合材料的摩擦系数比纯PTFE大,且随着载荷增加有所减小,石墨的加入可降低PTFE的摩擦系数.The friction and wear properties of PTFE composites filled with nano - Si3N4, nano - Si3N4 - graphite or nano - Si3 N4 - MoS2 are investigated with M - 2000 wear tester. The worn surfaces of PTFE composites are examined through a scanning electric microscopy （SEM）. The hardness of the materials are examined by HR - 150A. It is found that the addition of nano -Si3N4 increases the wear resistance and hardness for PTFE and prevents forming of wear micro crack. MoS2 enhances wear resistant performance largely for PTFE when it mixed with nano - Si3N4, specially with the load increasing. There are few micro crack in nano - Si3N4 rich gathering area and mach micro crack in nano - Si3N4 poor gathering area. The friction coefficient of PTFE composites filled with nano -Si3N4 reduces with the load increasing, the graphite may reduce the friction coefficient as it filled in PTFE, while the friction coefficient of PTFE filled with MoS2 and nano - Si3N4 increases when the load increasing.

关 键 词：纳米SI3N4 MOS2 石墨 PTFE 摩擦磨损 

分 类 号：TH117.3[机械工程—机械设计及理论]