摘要
采用热模压工艺制备了纳米ZrO2改性热塑性聚酰亚胺(PI)纳米复合材料,考察了复合材料的力学性能、在干摩擦和油润滑条件下的摩擦磨损性能,并利用扫描电子显微镜观察了冲击断面和磨损表面形貌。结果表明:纳米ZrO2在低含量下对PI复合材料的力学性能影响不大,随着其含量的增大,材料的弯曲性能下降,刚性增大。在干摩擦条件下,较低的纳米颗粒含量有助于转移膜的形成,从而降低材料的摩擦因数及磨损率。纳米ZrO2体积分数为1%时,材料的摩擦磨损性能较纯PI分别下降了50%和15%;在油润滑条件下,润滑油的流动性有助于纳米颗粒分布到整个摩擦界面,PI复合材料的摩擦因数及磨损率有明显降低,此时磨损机制以疲劳磨损为主。
Thermoplastic polyimide （PI） composites with different proportions of nano-ZrO2 were prepared by hot moulding process. The mechanical properties and tribologieal performances of PI composites were investigated. The morphologies of worn surfaces of the PI composites were observed on scanning electron microscope. Results indicate that the high content nano filler could decrease the mechanical properties and increase the rigidity of PI composites. Under dry friction condition,a lower content of nano ZrO2 can help to form the transfer film,the friction coefficient and wear rate of PI composites with 1% nano-ZrO2 reduce 50% and 15% separately compared to the pure Pl;under oil lubrication condition, the nano-ZrO2 can be distributed to the whole friction surface, and reduce the friction coefficient and wear rate of the PI composites,and the dominant wear mechanism is fatigue wear.
出处
《润滑与密封》
CAS
CSCD
北大核心
2009年第11期80-82,95,共4页
Lubrication Engineering
关键词
聚酰亚胺
纳米ZRO2
力学性能
摩擦磨损性能
油润滑
polyimide
nano-ZrO2
mechanical properties
friction and wear behavior
oil lubrication
