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首页> 外文期刊>Journal of Applied Physics >Oxygen-diffusion limited metal combustions in Zr, Ti, and Fe foils: Time- and angle-resolved x-ray diffraction studies
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Oxygen-diffusion limited metal combustions in Zr, Ti, and Fe foils: Time- and angle-resolved x-ray diffraction studies

机译：氧扩散限制Zr，Ti和Fe箔中的金属燃烧：时间和角度分辨X射线衍射研究

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摘要

The transient phase and chemical transformations of diffusion controlled metal combustions in bulk Zr, Ti, and Fe foils have been investigated, in situ, using novel time- and angle-resolved x-ray diffraction (TARXD). The TARXD employs monochromatic synchrotron x-rays and a fast-rotating diffracted beam chopper resolving the diffraction image temporally in time-resolution of ～45 μs along the azimuth on a 2D pixel array detector. The metal foil strips (10-25 μm in thickness) are ignited using a pulsed electrical heating with a typical heating rate of ～10~6K/s. The x-ray results indicate that the combustion occurs in molten metals, producing a wide range of stoichiometric solid oxides. It reflects an enhanced oxygen solubility and mobility of molten metals with respect to those of solid metals. However, the initial oxides formed are mainly oxygen-deficient metal oxides of ZrO, TiO, and FeO/Fe_3O_4 -the lowest suboxides stable at these high temperatures. These transition metal monoxides further react with unreacted molten metals, yielding the secondary products of Zr_3O, Ti_3O, and Ti_2O - but not in FeO/Fe_3O_4. On the other hand, the higher stoichiometric oxides of ZrO_2 and TiO_2 are formed in the later time only on the metal surface. These results clearly indicate that the combustion process of metal strips is diffusion limited and strongly depends on the solubility and diffusivity of oxygen into molten metals. The time-resolved diffraction data reveals no evidence for metal oxidation in solids, but a series of temperature-induced polymorphic phase transitions. The dynamic thermal expansibility of Fe measured in the present fast heating experiments is similar to those in static conditions (3.3~*10~(-5)/K vs 3.5~*10~(-5)/K for α-Fe and 6.5~*10~(-5)/K versus 7.0~*10~(-5)/K for γ-Fe).
机译：使用新颖的时间和角度分辨X射线衍射（TARXD），就地研究了Zr，Ti和Fe箔中扩散控制的金属燃烧的过渡相和化学转变。 TARXD使用单色同步加速器X射线和快速旋转的衍射光束斩波器，可在2D像素阵列检测器上沿方位角在时间分辨率为〜45μs的情况下暂时解析衍射图像。金属箔条（厚度为10-25μm）是通过脉冲电加热来点燃的，典型的加热速率为〜10〜6K / s。 X射线结果表明，燃烧发生在熔融金属中，产生了多种化学计量的固体氧化物。相对于固体金属，它反映了熔融金属的氧溶解度和迁移率提高。但是，形成的初始氧化物主要是ZrO，TiO和FeO / Fe_3O_4的缺氧金属氧化物-在这些高温下稳定的最低次氧化物。这些过渡金属一氧化物进一步与未反应的熔融金属反应，生成Zr_3O，Ti_3O和Ti_2O的副产物，但未生成FeO / Fe_3O_4。另一方面，ZrO_2和TiO_2的较高化学计量的氧化物仅在稍后在金属表面上形成。这些结果清楚地表明，金属带的燃烧过程受到扩散的限制，并且在很大程度上取决于氧在熔融金属中的溶解度和扩散性。时间分辨的衍射数据没有发现固体中金属被氧化的证据，而是一系列由温度引起的多晶型相变。当前快速加热实验中测得的铁的动态热膨胀性与静态条件下的动态热膨胀性相似（α-Fe和6.5为3.5〜* 10〜（-5）/K，3.5-*10~（-5）/ K 〜* 10〜（-5）/ K，而γ-Fe为7.0〜* 10〜（-5）/ K）。

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  • 来源
    《Journal of Applied Physics》 |2012年第6期|p.063528.1-063528.8|共8页
  • 作者

    Haoyan Wei; Choong-Shik Yoo; Jing-Yin Chen; Guoyin Shen;

  • 作者单位

    Department of Chemistry and Institute for Shock Physics, Washington State University, Pullman,Washington 99164-2816, USA;

    Department of Chemistry and Institute for Shock Physics, Washington State University, Pullman,Washington 99164-2816, USA;

    Lawrence Livermore National Laboratory, Livermore,CA 99551;

    HPCAT Geophysical Laboratory, Carnegie Institution of Washington,Argonne, Illinois 60439, 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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