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首页> 外文期刊>Journal of Materials Science >Mechanical performance of nanosilica filled quartz fiber/polyimide composites at room and elevated temperatures
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Mechanical performance of nanosilica filled quartz fiber/polyimide composites at room and elevated temperatures

机译：在室内填充石英纤维/聚酰亚胺复合材料的纳米碱填充石英纤维/聚酰亚胺复合材料的机械性能和高温

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摘要

The polyimide (PI) composites reinforced with silanized nanosilica (SNS) and/or quartz fabrics had been fabricated. Influences of the SNS dispersion on morphology, Vickers hardness, thermal stability and mechanical properties of these composites were studied. The uniform dispersion of SNS in PI resulted from the crosslink of silane pretreated on the surface of nanosilica and PI chains. The measurement results indicated that density, Vickers hardness and flexural strength were enhanced due to the addition of SNS into the PI matrix and the optimum content of SNS was 2 wt%. The thermal stability of the SNS reinforced PI composites increased with an increase in weight fraction of SNS, compared with the neat PI resin. The effects of quartz fabric on the mechanical properties of quartz fabric-reinforced PI composites with different volume fractions and effects of post-curing on the flexural strength were also investigated. Results also showed that better mechanical properties of quartz fabric-reinforced PI composites were obtained when the volume fraction of quartz fabric was 50%. The quartz fabric-reinforced PI composites containing 2 wt% SNS after post-curing exhibited the highest flexural strength and elasticity modulus by virtue of good fiber-matrix interface, and flexural strength was almost 500 MPa at 300 degrees C. It is pointed that the composites have a great application prospect as one of engineering materials with high strength and high temperature resistance.
机译：用硅烷化纳米硅（SNS）和/或石英织物增强的聚酰亚胺（PI）复合材料已经制造。 SNS分散对这些复合材料的形态，维氏硬度，热稳定性和机械性能的影响。 SNS在PI中的均匀分散在纳米硅和PI链的表面上预处理的硅烷的交联引起。测量结果表明，由于向PI基质添加SNS而增强了密度，维氏硬度和弯曲强度，并且SN的最佳含量为2wt％。与纯PI树脂相比，SNS增强Pi复合材料的热稳定性随着SNS的重量分数的增加而增加。还研究了石英织物对具有不同体积分数的石英织物增强PI复合材料的力学性能及对弯曲强度后固化的影响。结果还表明，当石英织物的体积分数为50％时，获得了石英织物增强PI复合材料的更好的机械性能。在后固化后含有2wt％SNS的石英织物增强的PI复合材料表现出最高纤维 - 基质界面的弯曲强度和弹性模量，并且弯曲强度在300摄氏度下几乎为500MPa。指出复合材料具有良好的应用前景，作为具有高强度和高耐温性的工程材料之一。

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  • 来源
    《Journal of Materials Science》 |2017年第20期|共14页
  • 作者

    Wang Jie; Zhou Wancheng; Luo Fa; Zhu Dongmei; Qing Yuchang;

  • 作者单位

    Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China;

    Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China;

    Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China;

    Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China;

    Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
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