hBN和MoS2填料对碳纤维织物-环氧树脂复合材料韧性和热稳定性的影响

IF 1.2 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI:10.3221/igf-esis.62.17

Y. S. Rao, Shivamurthy Basavannadevaru, Nanjangud Mohan Subbarao, N. Shetty

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引用次数: 0

摘要

报道了2～8wt%的六方氮化硼（hBN）和二硫化钼（MoS2）填料对碳纤维增强环氧复合材料（CFREC）韧性、显微硬度和热稳定性的影响。由于分别添加了高达6wt.%的hBN和MoS2填料，CFREC的I型、混合I/II型韧性和显微硬度得到了改善。hBN和MoS2改性的CFREC中的环氧基体增强了基体，偏转了裂纹路径并防止了分层。断裂试样的表面形态显示，由于团聚和纤维-填料-基体结合不良，加入6 wt.%填料后韧性降低。热分析表明，由于向CFREC中分别添加了4 wt.%MoS2和4 wt.%hBN，25%重量损失时的分解温度从395°C增加到430°C，从395℃增加到411°C。MoS2和hBN填料的不渗透特性导致气体分子的扩散路径曲折，并延迟了热分解。

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Influence of hBN and MoS2 fillers on toughness and thermal stability of carbon fabric-epoxy composites

Hexagonal boron nitride (hBN) and molybdenum disulfide (MoS2) fillers of 2 to 8 wt.% influence on toughness, microhardness and thermal stability of carbon fabric-reinforced epoxy composite (CFREC) reported. Mode-I, mixed-mode I/II toughness and microhardness of CFREC improved due to the addition of hBN and MoS2 separately upto 6 wt.% filler loading. The epoxy matrix in CFREC modified by hBN and MoS2 strengthens the matrix, deflects the crack path and resists delamination. Toughness reduced beyond 6 wt.% filler addition due to agglomeration and poor fiber-filler-matrix bonding as revealed by the surface morphology of the fracture specimen. Thermal analysis reveals decomposition temperature at 25% weight loss increased from 395 to 430 °C and 395 to 411 °C due to 4 wt.% MoS2 and 4 wt.% hBN addition to CFREC respectively. Impermeable characteristics of MoS2 and hBN fillers caused tortuous diffusion path for gas molecules and delayed thermal decomposition.

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