The effect of sliding speed and temperature on the tribological behaviour of carbon-carbon composites
The effect of sliding speed and temperature on the tribological behaviour of carbon-carbon composites
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DOI：
10.1016/s0043-1648(01)00554-3
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发表时间：
2001-05-01
期刊：
影响因子：
5
通讯作者：
Silva, RF
中科院分区：
文献类型：
--
作者：
Gomes, JR;Silva, OM;Silva, RF
尽管目前碳纤维增强复合材料（CFRC）作为轻质耐机械部件用于汽车和飞机工业，即用于摩擦学系统，如高能制动应用，但很少有关于这些材料在其他滑动条件下的摩擦学行为的研究。在空气中，在22-600°c的温度范围内，施加100 N的载荷，在三种不同的滑动速度（0.5,2.0和3.5 m s(-1)）下，在针盘式摩擦计中进行滑动实验。测试了单向CFRC复合材料（PAN/树脂碳）销和2D-CFRC（人造丝/树脂碳）复合材料盘。利用扫描电子显微镜和光学显微镜分析了碳-碳材料的摩擦磨损机理。在室温和低滑动速度（0.5 ms(-1)）下，磨损系数极低(K < 10(-6) mm（3) N-1 m(-1)）。然而，当滑动速度为3.5 m s（-1）时，磨损值增加了三个数量级。当比较在22度和300度或更高温度下的结果时，也观察到同样的趋势。在室温下，摩擦系数几乎与滑动速度无关，其值约为0.25，而在更高温度下的测试中，摩擦系数降至接近0.10。这项工作的主要结论是，碳-碳复合材料在室温和无润滑条件下的中等滑动速度下表现出独特的耐磨性能。然而，直接加热或摩擦加热可能会由于纤维脱粘和断裂而使这种材料的摩擦学响应恶化。(C) 2001 Elsevier Science B.V.版权所有
Although the current use of carbon fibre reinforced composites (CFRC) as light weight mechanical resistant components in automotive and aircraft industries, namely in tribological systems such as high energy brake applications, there are few studies concerning the tribological behaviour of these materials in other sliding conditions. Sliding experiments were performed in a pin-on-disc tribometer in air, applying 100 N load, in the temperature range of 22-600 degreesC, for three different sliding speeds (0.5, 2.0 and 3.5 m s(-1)). Unidirectional CFRC composite (PAN/resin carbon) pins and 2D-CFRC (rayon/resin carbon) composite discs were tested. The morphological features of the sliding surfaces were analysed by scanning electron and optical microscopies in order to understand the friction and wear mechanisms of carbon-carbon materials. At room temperature and low sliding speed (0.5 ms(-1)) the wear coefficient was extremely low (K < 10(-6) mm(3) N-1 m(-1)). However, the wear values increased in three orders of magnitude for a sliding speed of 3.5 m s(-1). The same trend was observed when comparing results taken at 22 and 300 degreesC or above. At room temperature, the friction coefficient was almost independent of the sliding speed, with values around 0.25, while a decrease to near 0.10 was obtained from tests at higher temperatures. The main conclusion of this work is that carbon-carbon composites show unique properties as wear resistant materials at room temperature and moderate sliding speeds under unlubricated conditions. However, direct or frictional heating may deteriorate the tribological response of such materials due to fibre debonding and fracture. (C) 2001 Elsevier Science B.V. Ah rights reserved.