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首页> 外文期刊>Composites Science and Technology >Mechanical, tribological and thermal properties of injection molded short carbon fiber/expanded graphite/polyetherimide composites
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Mechanical, tribological and thermal properties of injection molded short carbon fiber/expanded graphite/polyetherimide composites

机译：注塑式短碳纤维/膨胀石墨/聚醚酰亚胺复合材料的机械，摩擦学和热性能

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摘要

In this work, polyetherimide (PEI) modified by short carbon fibers (SCFs) and expanded graphite (EG) composites were fabricated using highly efficient extrusion compounding and injection molding techniques. The effects of SCF-EG hybrid on the mechanical, tribological and thermal properties of PEI composites were examined. It is shown that the tensile and flexural strength as well as fracture toughness of the PEI composites increase monotonically with increasing the relative SCF-EG content. The SCF/EG/PEI hybrid composites show synergies in the Young's modulus and flexural modulus. Moreover, the SCF-EG hybrid leads to the positive synergistic effects in significantly enhancing tribological performance of the PEI hybrid composites. SEM images for the fracture surfaces after tensile testing and the worn surfaces after wear testing of the hybrid composites were employed for explaining the observations for the mechanical and tribological properties. In addition, the PEI composites exhibit a significant reduction in the coefficient of thermal expansion and a moderate increase in thermal conductivity with the incorporation of SCF-EG hybrid. Due to the low cost of EG and its synergistic effects with SCFs, it is promising to fabricate high performance PEI hybrid composites by the simultaneous addition of SCFs and EG.
机译：在该工作中，使用短碳纤维（SCFS）和膨胀石墨（例如）复合材料改性的聚醚酰亚胺（PEI）使用高效挤出复合和注塑技术制造。研究了SCF-EG杂种对PEI复合材料的机械，摩擦学和热性能的影响。结果表明，抗拉和弯曲强度以及PEI复合材料的断裂韧性随着增加的相对SCF - 例如含量而单调地增加。 SCF / EG / PEI杂交复合材料显示杨氏模量和弯曲模量的协同作用。此外，SCF-例如杂交机会导致显着提高PEI杂交复合材料的摩擦学性能的正协同作用。采用拉伸试验后裂缝表面的SEM图像和杂交复合材料磨损测试后的磨损表面用于解释机械和摩擦学特性的观察。另外，PEI复合材料表现出热膨胀系数显着降低，并与掺入SCF-EG杂交的热导率的中等增加。由于例如与SCFS的低成本，例如其协同效应，因此有希望通过同时添加SCF和例如，制造高性能PEI混合复合材料。

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