摘要
用分级提纯对爆轰法得到的纳米金刚石进行超纯化处理,透射电子显微镜分析表明,超纯化纳米金刚石粒径分布均匀,平均粒径大约为10nm的球状颗粒。将这种纳米金刚石分散于聚乙二醇高分子分散体系,用四球摩擦磨损研究了分散体系的摩擦学性能,实验结果表明:纳米金刚石能有效提高聚乙二醇的抗磨性和承载能力;对其摩擦磨损表面的扫描电子显微镜分析表明,在边界润滑时,纳米金刚石减小摩擦磨损的机理为金刚石的纳米微球填充于磨损表面起滚球轴承效应形成一层超硬合金薄膜,由于这层膜的存在,避免了摩擦副的直接接触。
Super-purified by the gravititational separation and centrifugal purification of ultradispersed diamond powders obtained using explosion energy was studied. TEM analysis shows that the super-purified ultradispersed diamond powders with the average particle diameter about below of 10 nm are sphere-like. Suspensions of the nano-particles dispersed in polyoxyethylene glycol were prepared. Four-ball tests of suspensions show that the addition of a certain of ultradispersed diamond can effectively raise the the anti-wear ability and the load-carrying capacity of polyoxyethylene glycol. SEM analysis of their worn surfaces shows the mechanism of nano-scale diamond reducing diameter of wear scar and decreasing wear is due to the presence of super-hard alloy film formed by the chemical reaction of nano-ball with rubbing metal surface in boundary lubrication, which avoids contact directly of friction pairs.
出处
《润滑与密封》
CAS
CSCD
北大核心
2005年第5期7-10,13,共5页
Lubrication Engineering
基金
上海市教育委员会科技发展基金(02AK051)
中国博士后科学基金项目
上海市纳米专项基金项目(0152nm030).
关键词
纳米金刚石
聚乙二醇
摩擦学
纳米滚珠
超硬合金薄膜
ultradispersed diamond ： polyoxyethylene glycol
tribology
nano-ball
super-hard alloy film
