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首页> 外文期刊>Journal of Materials Research >Synthesis, structure and mechanical properties of ice-templated tungsten foams
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Synthesis, structure and mechanical properties of ice-templated tungsten foams

机译：冰模板钨泡沫的合成，结构和力学性能

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摘要

Tungsten foams with directional, controlled porosity were created by directional freeze-casting of aqueous WO_3 powder slurries, subsequent freeze-drying by ice sublimation, followed by reduction and sintering under flowing hydrogen gas to form metallic tungsten. Addition of 0.51 wt% NiO to the WO_3 slurry improved the densification of tungsten cell walls significantly at sintering temperatures above 1250 ℃, yielding densely sintered W-0.5 wt% Ni walls with a small fraction of closed porosity (＜5%). Slurries with powder volume fractions of 15-35 vol% were solidified and upon reduction and sintering the open porosity ranges from 27-66% following a linear relation with slurry solid volume fraction. By varying casting temperature and powder volume fraction, the wall thickness of the tungsten foams was controlled in the range of 10-50 μm. Uniaxial compressive testing at 25 and 400 ℃, below and above the brittle-to-ductile-transition temperature of W, yields compressive strength values of 70-96 MPa (25 ℃) and 92-130 MPa (400 ℃).
机译：通过定向冷冻浇铸含水WO_3粉末浆料，随后通过冰升华进行冷冻干燥，然后在流动的氢气中还原和烧结，以形成金属钨，可制成具有定向控制孔隙度的钨泡沫。在WO_3浆料中添加0.51 wt％的NiO，在1250℃以上的烧结温度下显着改善了钨电池壁的致密化，产生了致密烧结的W-0.5 wt％的Ni壁，且孔隙率很小（＜5％）。粉末体积分数为15-35％（体积）的浆料被固化，在还原和烧结后，开孔率与浆料固体体积分数呈线性关系，为27-66％。通过改变铸造温度和粉末体积分数，将钨泡沫的壁厚控制在10-50μm的范围内。在W的脆性-韧性转变温度之上和之下，分别在25和400℃下进行单轴压缩测试，得出抗压强度值分别为70-96 MPa（25℃）和92-130 MPa（400℃）。

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  • 来源
    《Journal of Materials Research》 |2016年第6期|753-764|共12页
  • 作者

    Andre Roethlisberger; Sandra Haeberli; Ralph Spolenak; David C. Dunand;

  • 作者单位

    Mechanical Integrity of Energy Systems, Swiss Federal Laboratories for Materials Science and Technology, EMPA, CH-8600 Duebendorf, Switzerland and Laboratory for Nanometallurgy, Department of Materials, ETH Zuerich, CH-8093 Zuerich, Switzerland;

    Laboratory for Nanometallurgy, Department of Materials, ETH Zuerich, CH-8093 Zuerich, Switzerland;

    Laboratory for Nanometallurgy, Department of Materials, ETH Zuerich, CH-8093 Zuerich, Switzerland;

    Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA;

  • 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);
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  • 正文语种 eng
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