Purpose

The purpose of this paper is to investigate the effect of doping element on the structural, thermal properties, mechanical performance and the failure mechanism of hexagonal nano boron nitride (h-BN)-reinforced basalt fabric (BF)/epoxy composites produced by hand lay-up and vacuum bagging technique. h-BN particles doped to composite materials increased the tensile, bending and impact strength of the composite at certain rates while 1 Wt. % h- BN addition shows the highest tensile and flexural strength.

Design/methodology/approach

The epoxy resin was doped with h-BN nanopowder at the certain rates (0, 1, 2 and 4 Wt.%) and the epoxy: hardener ratios used in the study were selected as 80%: 20% by weight. Then, with the aid of a roller by hand lay-up method, a mixture of epoxy + hardeners containing nanoparticles and nanoparticle-free were fed onto BFs, 12 layers of each dimension 30 cm × 30 cm. The surplus epoxy resin was moved away from the composite sheets using the vacuum bagging process and left to cure at room temperature for 24 h. ASTM D3039 for tensile, D7264 for three-point bending and D256 for Izod impact test were performed for the mechanical tests. After the tensile test, the morphologies of the fracture surface were examined with a stereomicroscope and various failure mechanisms are highlighted.

Findings

In this study, a series of basalt/epoxy composites with h-BN nanopowders have been prepared to identify the effect of filler ratio on mechanical properties. It has been known from the results of mechanical experiments that the addition of h-BN improves the mechanical performance of materials at a certain rate. The tensile and flexural strengths of h-BN doped composites, increase for concentrations of 1 Wt.% h-BN, but decrease with the increasing content of it. The basalt/epoxy resin composite with higher mechanical properties could be a potential material in the automotive and aerospace industries.

Originality/value

The aim of this study is to contribute to literature within the context of this new combination of composites and their mechanical properties, failure mechanisms. It presents detailed characterization of each composite by using X-ray differaction (XRD), differential scanning calorimetry (DSC), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy.

中文翻译：

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六方氮化硼纳米粉体的添加对玄武岩纤维增强复合材料力学性能的影响

目的

本文旨在研究掺杂元素对手糊法制备的六方纳米氮化硼（h-BN）增强玄武岩织物（BF）/环氧树脂复合材料结构、热性能、力学性能及失效机理的影响。真空袋装技术。复合材料中掺杂 h-BN 颗粒在 1 Wt 时以一定比例提高了复合材料的拉伸、弯曲和冲击强度。% h-BN 添加量显示出最高的拉伸强度和弯曲强度。

设计/方法论/途径

环氧树脂以一定的比例（0、1、2和4重量％）掺杂h-BN纳米粉末，研究中使用的环氧树脂：硬化剂的比例选择为80％：20％重量。然后，借助手糊法的辊筒，将含有纳米颗粒和不含纳米颗粒的环氧树脂+固化剂的混合物馈送到BF上，每层尺寸为30cm×30cm，共12层。使用真空袋工艺将多余的环氧树脂从复合材料片材上移走，并在室温下固化 24 小时。机械测试采用 ASTM D3039 拉伸试验、D7264 三点弯曲试验和 D256 悬臂梁冲击试验。拉伸试验后，用立体显微镜检查断裂表面的形态，并突出显示各种失效机制。

发现

在本研究中，制备了一系列含有 h-BN 纳米粉末的玄武岩/环氧树脂复合材料，以确定填料比例对机械性能的影响。由力学实验结果可知，h-BN的添加使材料的力学性能得到一定程度的提高。h-BN掺杂复合材料的拉伸和弯曲强度随着h-BN浓度为1 Wt.%而增加，但随着其含量的增加而降低。具有较高机械性能的玄武岩/环氧树脂复合材料可能成为汽车和航空航天工业的潜在材料。

原创性/价值

本研究的目的是在复合材料的这种新组合及其机械性能、失效机制的背景下为文献做出贡献。它通过使用 X 射线微分 (XRD)、差示扫描量热法 (DSC)、傅里叶变换红外光谱 (FT-IR) 和扫描电子显微镜来详细表征每种复合材料。