Abstract The effect of dimension of carbon foam (CF) grains used as a filler of epoxy matrix on the morphology and thermomechanical and tribological properties of final composites was described. The carbon foam proposed as particle reinforcement of composites was prepared from epoxy resin of diglycidyl ether of bisphenol A type cured with phenol-formaldehyde resin (novolac) in a self-foaming process followed by carbonization. Structures of the carbon foam filler and resultant composites were studied by microscopic and spectroscopic methods. Three different carbon foam grain fractions, below 200 μm, 200–315 μm and below 315 μm, keeping CF porous structure and specific properties, were used to obtain new composite materials. There were observed good quality dispersion of CF grains in epoxy matrix and excellent adhesion at interfacial areas, regardless of carbon foam fraction. In the effect, these composites have enhanced thermomechanical and tribological properties and relatively low density compared to carbon-polymer composites produced so far. It was found that all CF fractions used reduced friction coefficient of resultant composites compared to pure epoxy matrix, however the influence of individual filler fraction on composite's COF was different. The morphology of worn surfaces of epoxy composites after friction tests showed that the effect depends on grain fraction of CF filler as well as on the load used.

中文翻译：

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粉碎的碳泡沫颗粒分数对无规环氧-碳复合材料的形貌、热机械和摩擦学性能的影响

摘要 描述了用作环氧树脂基体填料的碳泡沫 (CF) 颗粒尺寸对最终复合材料的形貌、热机械和摩擦学性能的影响。提出作为复合材料颗粒增强材料的碳泡沫是由双酚 A 型二缩水甘油醚环氧树脂在自发泡过程中用酚醛树脂（酚醛清漆）固化然后碳化制备的。通过显微和光谱方法研究了碳泡沫填料和所得复合材料的结构。三种不同的碳泡沫颗粒部分，低于 200 μm、200-315 μm 和低于 315 μm，保持 CF 多孔结构和特定性能，用于获得新的复合材料。观察到 CF 颗粒在环氧树脂基体中的良好分散性和界面区域的优异附着力，无论碳泡沫分数如何。实际上，与迄今为止生产的碳-聚合物复合材料相比，这些复合材料具有增强的热机械和摩擦学性能以及相对较低的密度。结果表明，与纯环氧树脂基体相比，所有 CF 组分都降低了所得复合材料的摩擦系数，但各个填料组分对复合材料 COF 的影响是不同的。摩擦试验后环氧复合材料磨损表面的形态表明，这种影响取决于 CF 填料的颗粒分数以及所使用的载荷。结果表明，与纯环氧树脂基体相比，所有 CF 组分都降低了所得复合材料的摩擦系数，但各个填料组分对复合材料 COF 的影响是不同的。摩擦试验后环氧复合材料磨损表面的形态表明，这种影响取决于 CF 填料的颗粒分数以及所使用的载荷。结果表明，与纯环氧树脂基体相比，所有 CF 组分都降低了所得复合材料的摩擦系数，但各个填料组分对复合材料 COF 的影响是不同的。摩擦试验后环氧复合材料磨损表面的形态表明，这种影响取决于 CF 填料的颗粒分数以及所使用的载荷。