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Fibre structure preservation in composite recycling using thermolysis process
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2021-02-13 , DOI: 10.1016/j.resconrec.2021.105482
Hamza Qazi , Richard Lin , Krishnan Jayaraman

Recycling of thermoset carbon fibre reinforced polymer (TS-CFRP) composites using thermal processes result in recovered carbon fibres (rCF), being fluffy and losing their alignment and length, leading to a deteriorating impact on the remanufactured part mechanical properties. In this work, the thermolysis recycling process is used to preserve the fibre structure including fabric stacking sequence, fibre orientation, alignment and length from the waste TS-CFRP parts. Investigation on the rCF structures with varying fabric and stacking sequence has been conducted to understand fibre nesting, alignment disturbance and permeability characteristics for composites remanufacturing. The fibre nesting in the rCF structures affects the permeability and hence should be considered for optimising the remanufacturing process parameters. Mechanical characterisation – tensile and interlaminar shear strength – of TS-CFRP and TS-rCFRP parts has also been carried out and compared with the properties from the existing literature to understand the effect of multiple recycling on the performance of the remanufactured composite parts with preserved fibre structure. The results showed that the overall fibre structure from the waste TS-CFRP part can be preserved using the thermolysis process providing the potential to directly replace the long virgin fibres in the manufacture of products with structural value. The remanufactured composite parts retain 80~90% of the TS-CFRP modulus after multiple recycling. The reduction in tensile properties of the TS-rCFRP parts was recorded compared to TS-CFRP parts, mainly due to the removal of fibre sizing. However, after first recycling, minimal reduction in tensile properties was recorded in the subsequent recycling.



中文翻译:

使用热解工艺的复合材料回收中的纤维结构保存

使用热过程对热固性碳纤维增强聚合物(TS-CFRP)复合材料进行回收会导致回收的碳纤维(rCF)蓬松并失去其排列和长度,从而导致对再制造零件机械性能的恶化影响。在这项工作中,热解回收过程用于保护纤维结构,包括织物堆叠顺序,纤维取向,排列和长度,以及废TS-CFRP零件的长度。已经对具有不同织物和堆叠顺序的rCF结构进行了研究,以了解复合材料再制造中的纤维嵌套,取向干扰和渗透性特征。rCF结构中的纤维嵌套会影响渗透性,因此应考虑优化再制造工艺参数。还对TS-CFRP和TS-rCFRP零件进行了机械表征(拉伸和层间剪切强度),并将其与现有文献的性能进行了比较,以了解多次回收对保留纤维的再制造复合零件性能的影响。结构体。结果表明,使用热解工艺可以保留废TS-CFRP部分的整体纤维结构,从而有可能直接替代具有结构价值的产品中的长原始纤维。多次循环后,再制造的复合零件保留了80-90%的TS-CFRP模量。与TS-CFRP零件相比,记录了TS-rCFRP零件的拉伸性能下降,这主要是由于去除了纤维上浆。但是,在第一次回收之后,

更新日期:2021-02-15
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