摘要
The effect of brake oil on sliding behavior of carbon/carbon(C/C) and carbon/carbon-silicon carbide(C/C-SiC) composites was investigated with the variation of laminate orientation and surface conformity. The partial and low conformity contacts with the normal and parallel orientations of laminates were considered. The normal load was varied from 50 to 90 N in a step of 10 N. The friction and wear behavior was investigated under reciprocating sliding conditions. The results showed that friction coefficient and wear loss of composites with normal orientation of laminates were larger as compared to those of composites with parallel orientation of laminates. C/C composites with normal orientation of laminates yielded the highest value of friction coefficient. Wear loss decreased by a maximum of 78%, and friction coefficient decreased by a maximum of 49% in low conformity contacts as compared to partial conformity contacts. The presence of brake oil reduced the adhesion tendency of compacted wear debris because the formation of friction film was difficult, and thus, friction behavior was affected. The wear debris retention between the contact surfaces due to confined area motion in reciprocating sliding depicted the tribological behavior.
研究制动油、层板取向和摩擦接触方式对碳/碳(C/C)和碳/碳-碳化硅(C/C–SiC)复合材料摩擦磨损行为的影响。研究往复滑动条件下材料的摩擦磨损行为,分别采用两种不同的接触方式进行摩擦试验,即销-盘式和球-盘式,同时考虑层板方向(垂直和平行方向)的影响。法向载荷范围为50-90 N,变化间隔为10 N。结果表明,与层板平行取向复合材料相比,垂直取向复合材料的摩擦因数和磨损量均较大,垂直取向C/C复合材料具有最大的摩擦因数。与销-盘式接触相比,球-盘式接触摩擦的样品其磨损量最大可降低78%,摩擦因数最大可降低49%。润滑油的存在减小磨屑被压实的倾向,从而使摩擦膜难以形成,因此影响摩擦行为。在往复滑动过程中,由有限区域运动而引起的接触面间的磨屑滞留可描述摩擦磨损行为。
