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首页> 外文期刊>CERAMICS INTERNATIONAL >Fabrication, mechanical performance and tribological behaviors of polyacetal-fiber-reinforced metakaolin-based geopolymeric composites
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Fabrication, mechanical performance and tribological behaviors of polyacetal-fiber-reinforced metakaolin-based geopolymeric composites

机译：聚缩醛纤维增强偏高岭土基地质聚合物复合材料的制备，力学性能和摩擦学性能

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摘要

A type of new fiber-reinforced geopolymeric composites was developed by combining metakaolin and polyacetal (POM) fibers. High-strength POM fibers were first prepared through melt spinning followed by a hot-drawing procedure, and then a series of metakaolin-based geopolymeric composites with different contents of POM fibers were synthesized. The mechanical and tribological properties of the resulting composites were evaluated, and the morphology and microstructure were investigated. The POM fibers provided significant mechanical reinforcement for the metakaolin-based geopolymer. The composites were optimized for flexural and compressive strength with respect to fiber content and fiber length. Compared to unreinforced geopolymer, the composites obtained an optimum improvement by approximate 150% in flexural strength and by almost 26% in compressive strength. Moreover, the longer POM fibers exhibit a better reinforcement effect on the geopolymer, resulting in a lower optimal fiber content for the composites to achieve the maximum mechanical data. The reinforcing mechanisms were discussed on the basis of morphological investigation and considered as a cumulative energy-dissipating effect by fiber pullout and orientation, fiber rupture, fiber debonding from the matrix, and fiber bridging within cracks. The geopolymeric composites also achieved a considerable reduction in friction coefficient and abrasion loss rate in the presence of POM fibers. Such an enhancement of tribological performance is ascribed to the formation of self-lubricating transfer films between the contact surfaces of composites against the steel counterpart. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
机译：通过结合偏高岭土和聚缩醛（POM）纤维开发了一种新型的纤维增强的地聚合物复合材料。首先通过熔融纺丝，然后通过热牵伸工艺制备高强度的POM纤维，然后合成一系列具有不同含量的POM纤维的偏高岭土基高分子复合材料。评价了所得复合材料的力学和摩擦学性能，并研究了其形态和微观结构。 POM纤维为基于偏高岭土的地质聚合物提供了显着的机械增强作用。针对纤维含量和纤维长度优化了复合材料的弯曲强度和压缩强度。与未增强的地质聚合物相比，复合材料的抗弯强度提高了约150％，抗压强度提高了约26％，从而获得了最佳的改进。此外，较长的POM纤维对地质聚合物表现出更好的增强效果，从而导致复合材料的最佳纤维含量降低，从而获得最大的机械数据。在形态研究的基础上讨论了增强机理，并认为这是通过纤维拉出和定向，纤维断裂，纤维从基体上脱粘以及纤维在裂缝内桥接所产生的累积能量消散作用。在POM纤维存在的情况下，地聚合物复合材料还实现了摩擦系数和磨损损耗率的大幅降低。摩擦学性能的这种提高归因于在复合材料与钢对应物的接触表面之间形成自润滑转移膜。 （C）2016 Elsevier Ltd和Techna Group S.r.l.版权所有。

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