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Design of tungsten fiber-reinforced tungsten composites with porous matrix

机译：多孔基质钨纤维增强钨复合材料的设计

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摘要

To overcome the brittleness of tungsten, tungsten fiber-reinforced tungsten composites (W_f/W) have been developed using an extrinsic toughening mechanism. In this work, a novel type of W_f/W with porous matrix produced by field assisted sintering technology (FAST) is studied. The material is optimized regarding mechanical behavior, standing on the adjusting of matrix porosity and fiber mass fraction. Two series of samples with different matrix density and fiber mass fraction are prepared. Based on the mechanical testing, porous matrix W_f/W can represent a promising pseudo ductile behavior. Relatively lower matrix density is helpful to avoid a sudden load-drop during crack opening. The different fracture behavior is attributed to the different fiber/matrix interface bonding condition. By increasing fiber mass fraction from 20% to 50%, porous matrix W_f/ W can facilitate improved mechanical properties regarding fracture toughness and strength. However, by further increasing the fiber mass fraction from 50% to 60%, a deterioration of mechanical properties is observed. The high porosity of porous matrix W_f/W causes a degradation of the thermal conductivity compared to conventional bulk tungsten. No significant change regarding thermal expansion coefficient is observed when decreasing the matrix density.
机译：为了克服钨的脆性，已经使用外列增韧机制开发了钨纤维增强钨复合材料（W_F / W）。在这项工作中，研究了具有现场辅助烧结技术（快）产生的多孔基质的新型W_F / W.该材料是关于机械性能的优化，站在基质孔隙率和纤维质量分数的调节。制备两系列具有不同基质密度和纤维质量分数的样品。基于机械测试，多孔基质W_F / W可以代表有前景的伪延展性行为。相对较低的矩阵密度有助于避免裂缝开口期间突然的负载下降。不同的裂缝行为归因于不同的光纤/矩阵界面键合条件。通过将纤维质量分数增加20％至50％，多孔基质W_F / W可以促进关于断裂韧性和强度的改善的机械性能。然而，通过进一步增加50％至60％的纤维质量分数，观察到机械性能的劣化。与常规散装钨相比，多孔基质W_F / W的高孔隙率导致导热率的劣化。在降低矩阵密度时，观察到关于热膨胀系数的显着变化。

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  • 来源
    《Materials Science and Engineering》 |2021年第10期|141361.1-141361.12|共12页
  • 作者

    Yiran Mao; Jan Coenen; Sree Sistla; Chao Liu; Alexis Terra; Xiaoyue Tan; Johann Riesch; Till Hoeschen; Yucheng Wu; Christoph Broeckmann; Christian Linsmeier;

  • 作者单位

    School of Mechanical Engineering Hefei University of Technology Hefei 230009 China Forschungszentrum Juelich GmbH Institut fuer Energie- und Klimaforschung - Plasmaphysik Partner in the Trilateral Euregio Cluster 52425 Juelich Germany;

    Forschungszentrum Juelich GmbH Institut fuer Energie- und Klimaforschung - Plasmaphysik Partner in the Trilateral Euregio Cluster 52425 Juelich Germany Department of Engineering Physics University of Wisconsin Madison WI 53706 Madison USA;

    Institut fuer Werkstoffanwendungen Im Maschinenbau (IWM) RWTH Aachen University 52062 Aachen Germany;

    Institut fuer Werkstoffanwendungen Im Maschinenbau (IWM) RWTH Aachen University 52062 Aachen Germany;

    Forschungszentrum Juelich GmbH Institut fuer Energie- und Klimaforschung - Plasmaphysik Partner in the Trilateral Euregio Cluster 52425 Juelich Germany;

    School of Mechanical Engineering Hefei University of Technology Hefei 230009 China Forschungszentrum Juelich GmbH Institut fuer Energie- und Klimaforschung - Plasmaphysik Partner in the Trilateral Euregio Cluster 52425 Juelich Germany School of Material Science and Engineering Hefei University of Technology Hefei 230009 China;

    Max-Planck-Institut fuer Plasmaphysik 85748 Garching B. Muenchen Germany;

    Max-Planck-Institut fuer Plasmaphysik 85748 Garching B. Muenchen Germany;

    School of Mechanical Engineering Hefei University of Technology Hefei 230009 China School of Material Science and Engineering Hefei University of Technology Hefei 230009 China Key Laboratory of Interface Science and Engineering of New Materials Ministry of Education Taiyuan University of Technology Taiyuan 030024 China;

    Institut fuer Werkstoffanwendungen Im Maschinenbau (IWM) RWTH Aachen University 52062 Aachen Germany;

    Forschungszentrum Juelich GmbH Institut fuer Energie- und Klimaforschung - Plasmaphysik Partner in the Trilateral Euregio Cluster 52425 Juelich Germany;

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  • 正文语种 eng
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  • 关键词

    Fiber-reinforced composites; Porous matrix; Tungsten; Mechanical properties; Field assisted sintering technology;

    机译：纤维增强复合材料;多孔基质;钨;机械性能;现场辅助烧结技术;

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