致密工艺对C/C复合材料摩擦性能的影响

采用针刺全炭纤维网胎无纬布整体结构预制体为骨架，经化学气相沉积（CVD）、树脂浸溃（RD固化致密及炭化、石墨化制得C／C复合材料。研究了粗糙层（RL）和树脂炭（RC）对摩擦性能的影响。结果表明，RL结构的C／C复合材料的摩擦性能较好，稳定性较高，是用作飞机刹车材料的前提；采用CVD＋RI制备且石墨化后的C／C复合材料具有优良的摩擦磨损特性；CVD试样的密度较低时，摩擦系数较高，但磨损较大，较难形成完整的摩擦膜。

THE EFFECT OF DENSIFICATION ON FRICTIONAL PROPERTIES OF C/C COMPOSITES

The preforms of composites were needled by non-weave yarn carbon cloth deposited in a chemical vapor deposition(CVD)process,then treated by resin impregnation,carbonization and graphitization.In this paper,we studied the effect of RL and resin carbon on tribo-characteristic.It was discovered that C/C composites with RL structure had finer tribological behaviors and higher stabilities,so RL is the prerequisite as an aircraft braking material;the samples prepared by CVD+RI,then graphitization existed a perfect friction and wear characteristic;when the sample with a low density,its coefficient of friction and wear was high so it could not form complete films.