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Control of non-equilibrium microstructure and function of oxide scales formed in high temperature oxidation of metalic materials for high efficiency energy comversion

控制金属材料高温氧化过程中形成的氧化皮的非平衡微观结构和功能，实现高效能量转换

基本信息

批准号：
16360361
负责人：
MARUYAMA Toshio
金额：
$ 9.02万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

(1)Quantitative prediction of void formation in a growing scales in high temperature oxidationEquations have been proposed for evaluation of chemical potential distribution, ionic fluxes and its divergence in a growing oxide scales. The divergence was proved to be the good measure for evaluating the void formation. The validity was experimentally confirmed in magnetite scales formed in high temperature oxidation of iron.(2)High temperature oxidation of ferritiv Fe-Cr alloys for interconnects in solid oxide fuel cell (SOFC) and electrical conductivity of the oxide scale.Simulating the operation condition of SOFC, high temperature oxidation of Fe-16Cr alloys was conducted in the dual atmosphere, in which specimens were exposed air for the cathode and the mixture of H2O (97%) and H2 (3%) at 1073 K. The continuous protective Cr2O3 scales were formed on both sides. The growth rates were quite similar, indicating the major defect was interstitial ion of Cr in two cases.The estimation of the … More oxygen potential distribution clarified that the oxygen potential is low almost the whole region in scales. This fact predicted the reason why the electrical conductivity of the Cr2O3 scales were high. Applied external currents retarded the growth rate of Cr203 on the cathode and enhanced it on the anode. The equations were proposed for evaluating the scale growth rate under the external current and the equations predicted the growth rate in the long term exposures.(3)Control of microstructure development and design of the function of the scales.The summary of this project is the following(1)The quantitative prediction of microstructure development is possible with diffusion coefficients of constituent ions as a function of oxygen potential.(2)For controlling microstructure, it is dispensable to design the diffusivity. The appropriate doping is an possibility for the design of the microstructure.(3)The evaluation of chemical potential distribution and divergences of ionic fluxes is very powerful for controlling microstructures and designing the function of scales. Less

(1)提出了高温氧化层中空穴形成的定量预测方程，用于评价氧化层中的化学势分布、离子通量及其发散性。发散度被证明是评价空穴形成的良好量度。(2)固体氧化物燃料电池(SOFC)互连线铁氧体Fe-Cr合金的高温氧化及氧化膜的导电性。模拟固体氧化物燃料电池(SOFC)的运行条件，在1073K下，将样品暴露在阴极空气和H2O(97%)和H2(3%)的混合物中，在双重气氛中对Fe-16Cr合金进行高温氧化，形成连续的保护性Cr2O3膜。生长速度非常相似，表明两例的主要缺陷是铬的间隙离子。…的估计更多的氧势分布表明，氧势在尺度上几乎整个区域都很低。这一事实预测了Cr2O3膜电导率高的原因。外加电流抑制了Cr203在阴极上的生长速度，增强了其在阳极上的生长速度。(3)组织发展的控制和氧化皮功能的设计。本课题的总结如下：(1)可以利用成分离子的扩散系数作为氧势的函数来定量预测组织的发展。(2)对于微观组织的控制，扩散系数的设计是不必要的。适当的掺杂为微观结构的设计提供了可能。(3)评价离子通量的化学势分布和离散度，对于控制微观结构和设计尺度的功能是非常有力的。较少