不同热解炭结构的炭/炭复合材料的摩擦特性  

Friction Properties of Carbon/Carbon Composites with Different Pyrocarbon Structure

作　　者：徐惠娟[1] 熊翔[1] 黄伯云[1] 彭剑昕[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《摩擦学学报》2003年第4期344-349,共6页Tribology

基　　金：国家重点工业性试验项目(计高技1998-1817).

摘　　要：在MM-1000型摩擦磨损试验机上,对具有光滑层和粗糙层热解炭结构的2种炭/炭复合材料进行了模拟飞机正常着陆和中止起飞条件下的摩擦磨损性能试验,用扫描电子显微镜对其磨损表面形貌进行了观察分析.结果表明:具有粗糙层热解炭结构的炭/炭复合材料在不同能载条件下具有较高的摩擦系数,刹车力矩曲线较为平稳,磨损表面形成较为连续、致密的磨屑层;具有光滑层热解炭结构的炭/炭复合材料在正常着陆条件下刹车力矩曲线波动很大,磨损较小,摩损表面形成较为粗糙的磨屑层;随着能载水平的增加(中止起飞条件),摩擦系数显著下降,氧化磨损质量损失明显增大,温升较高,磨损表面氧化严重.具有粗糙层热解炭结构的炭/炭复合材料的摩擦性能较优,尤其是其高能摩擦特性更优,适宜用作飞机刹车材料.The friction and wear behaviors of two kinds of carbon/carbon (C/C) composites with different pyrocarbon structures were investigated on an MM-1000 test rig at simulating airplane normal landing and rejected take-off (RTO) conditions. The worn surfaces of the specimens were observed with a scanning electron microscope. As a result, the C/C composite with rough laminar (RL) pyrocarbon structure had high friction coefficient and stable brake torque curve at different energy conditions, and on its worn surface a continuous and compact debris layer was formed. Contrary to the above, the brake torque curve of the C/C composite with smooth laminar (SL) pyrocarbon structure showed large fluctuation and small dimension loss, and on its worn surface a rougher debris layer was generated at the normal landing condition. It recorded remarkably reduced friction coefficient, obviously increased oxidation mass loss, large temperature-rise and significantly enhanced oxidation with increasing energy (RTO condition). Since the C/C composite with RL pyrocarbon structure had better friction properties than the one with SL pyrocarbon structure and especially more excellent high energy friction performance, it could be a promising candidate as airplane brake material.

关 键 词：炭/炭复合材料 飞机刹车片 热解炭 摩擦特性 

分 类 号：TB332[一般工业技术—材料科学与工程]