摘要
用原位复合法制备了纳米SiO2 PI(热塑性)复合材料,研究了纳米SiO2含量对复合材料的减摩抗磨作用,考察了不同载荷与速度对摩擦学性能的影响,并利用扫描电子显微镜(SEM)对SiO2 PI复合材料的磨损表面和转移膜进行了观察和分析。结果表明:在本文实验条件下,SiO2 PI复合材料中SiO2最佳含量为4 0～5 0wt.%;纳米SiO2能显著增强转移膜与偶件的结合强度,提高PI基复合材料的减摩抗磨性能;纯PI和SiO2 PI复合材料呈现不同的磨损机制。
NanoSiO2/PI(polyimide) composites with various SiO2 mass fractions were prepared by an in situ process. The tribological behavior of the pure PI and composites was investigated using a blockonring test rig under dry sliding. The experimental results showed that the optimal mass fraction of nanometer SiO2 in the PI matrix should be recommended as (4.0～5.0)wt.% in order to reach the best comprehensive tribological properties. The variables such as applied load and sliding speed had a significant influence on friction and wear performance of the PI/SiO2 nanocomposites. The results based on SEM indicated that nanometer SiO2 could enhance the adhesion of the transfer films to the surface of steel ring, and therefore, greatly reduce the wear of the nanocomposites. Pure PI and polyimide/SiO2 nanocomposites have different wear mechanism.
出处
《电子显微学报》
CAS
CSCD
北大核心
2003年第5期420-425,共6页
Journal of Chinese Electron Microscopy Society
