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The Study on Carbon Nanofiber (CNF)-Dispersed B_4C Composites

机译:碳纳米纤维分散的B_4C复合材料的研究

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摘要

Carbon nanofiber (CNF)-dispersed B_4C composites have been synthesized and consolidated directly from mixtures of elemental raw powders by pulsed electric current pressure sintering (1800℃/10 min/30 MPa). A 15 vol% CNF/B_4C composite with ~99% of dense homogeneous microstructures (~0.40μm grains) revealed excellent mechanical properties at room temperature and high temperatures: a high bending strength (σ_b) of ~710 MPa, a Vickers hardness (H_v) of~36 GPa, a fracture toughness (K_(IC)) of~7.9MPam, and high-temperature σ_b of 590 MPa at 1600℃ in N_2. Interfaces between the CNF and the B_4C matrix were investigated using high-resolution transmission electron microscopy, EDS, and electron energy-loss spectroscopy.
机译:碳纳米纤维分散的B_4C复合材料是通过脉冲电流压力烧结(1800℃/ 10 min / 30 MPa)直接从单质原料粉末的混合物中合成和固结的。 15%(体积)CNF / B_4C复合材料具有约99%的致密均匀的微观结构(约0.40μm晶粒),在室温和高温下显示出优异的机械性能:约710 MPa的高弯曲强度(σ_b),维氏硬度(H_v) N_2时的温度为〜36 GPa),断裂韧性(K_(IC))约为7.9MPam,高温σ_b为1600 MPa。使用高分辨率透射电子显微镜,EDS和电子能量损失谱仪研究了CNF和B_4C基质之间的界面。

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    Department of Molecular Chemistry & Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan;

    Department of Molecular Chemistry & Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan;

    Department of Molecular Chemistry & Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan;

    Nippon Electric Glass Co. Ltd., Seiran, Ohtsu 520-8639, Japan;

    National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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  • 入库时间 2022-08-17 13:43:39

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