连续炭纤维增强受电弓滑板致密化及其性能

滑动受流条件下,树脂基滑板材料的温升会影响滑板使用的稳定性。采用炭化-液相浸渍法对滑板进行热稳定性及致密化处理,系统分析了热处理前后滑板性能的变化,并对致密化效果进行评价,利用磨损表面扫描图像分析摩擦磨损机理。结果表明:经过800℃热处理后,滑板的耐温性提高;热处理及浸渍后,受电弓滑板试样电阻率明显减小,热处理之后电阻率降低约100%;冲击强度降低,摩擦因数增大,体积磨损量增加;经过4次致密化处理后,滑板的气孔率下降约45%;冲击性能和摩擦磨损性能有所提高;未热处理的受电弓滑板在摩擦过程中主要的机械磨损形式是磨粒磨损和黏着磨损;热处理后磨粒磨损是主要磨损形式。

Densification and Properties of Continuous Carbon Fiber Reinforced Contact Strip

In current-carrying wear condition,the temperature increase of material could affect the thermal reliability of resin-based contact strip greatly.The carbonization-liquid impregnation on the contact strip for thermal stability and densification was adopted.The influence of this method on the contact strip was investigated,meanwhile,the densification effect was evaluated,and SEM was used to analyze friction and wear mechanism.The results showed that the thermal reliability of phenolic resin are enhanced after 800°C heat treatment;the contact strip specimen resistivity decreases significantly(about 100% after carbonization) and the impact strength decreased;and friction coefficient and wear volume increased.After four times densification treatment,the porosity is decreased about 45%,and the impact property and wear performance are both improved.The mechanical wear of contact strip specimen are abrasive wear,adhesive wear and accompanied by oxidation without heat treatment;while after heat treatment,abrasive wear is the main wear form.