基体碳结构对轴间密封环用C/C复合材料摩擦磨损特性的影响

 在m²000型摩擦实验机上,在不同载荷作用下,对4种具有不同偏光结构的C/C复合材料与40Cr钢配副进行环—块滑动摩擦实验。结果表明:相同载荷下,具有粗糙层（RL）基体碳结构试样的摩擦系数都最高,且随载荷的增加在0.151～0.165之间波动。而光滑层（SL）碳结构的试样的摩擦系数最低,随载荷增加在0.105～0.117之间缓慢降低。随时间延长,RL结构的试样在高载荷下摩擦系数下降,SL结构的试样摩擦系数除60N外略有上升,树脂碳增密的试样摩擦系数均下降,而树脂碳+SL碳的试样仅80N、150N的基本保持不变。RL结构的试样体积磨损量最大,最大值为150N时的1 61mm³,而SL+树脂碳结构的试样体积磨损量最小,在0.391～0.420mm³之间。SEM观察表明:随载荷增加,RL结构的试样摩擦表面形貌仍很完整、光滑,而浸渍增密的试样纤维拔出现象加剧,SL+树脂碳结构的试样摩擦表面逐渐完整。

Influence of Carbon Matrix on the Tribology of C/C Composites Used as Shaft Sealing Ring

On m²000 wear machine, coupled with 40Cr steel, four kinds of C/C composites with different carbon matrix structures have been tested under different loadings for friction and wear characteristics. The results show: the RL（rough layer） structure sample gets the highest friction coefficient 0.151～0.165 and fluctuating with loading increase;and the SL（smooth layer） structure sample gets the lowest friction coefficient 0.105～0.118 and decreasing slowly with loading increase. With time prolonging, the friction coefficient of RL structure sample decreases under high loading, while that of SL structure sample increases a little except under 60N. Under all the loadings, the friction coefficient of resin carbon densified sample decreases with time prolonging, but that of SL+resin carbon structure sample shows the variety trend being different under different loadings. The bulk wear loss of RL structure sample is the highest which could reach 1.61 mm³ under 150N, and that of SL+resin carbon structure sample is the least. The SEM observations show: with loading increase, the wear surface of RL sample changs only a little, while that of the resin carbon sample exhibits more and more severe surface fiber drawn phenomenon, and the SL+resin carbon structure sample exhibits more and more smooth wear surface.