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Effect of Liquid-phase Siliconizing Process on Silicon Diffusion Behavior in Mo Matrix

机译：液相硅化工艺对钼基体中硅扩散行为的影响

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摘要

MoSi_2 functionally graded coating on Mo substrate is prepared by liquid-phase siliconizing technology. The SEM, GDS and XRD analysis shows that the silicon content in gradient layer appears in three changing regularities. Along the Mo substrate to the surface of the coating, the phase composition of gradient coating changes as follows: Mo→transition layer Mo (main phase) + Mo_3Si + Mo_5Si_3 → intermediate layer MoSi_2 → surface layer MoSi_2 (main phase) + Si. According to the Si-Mo diffusion couple and Arrhenius equation, the activation energy (Q) was obtained as 430 kJ·mol~(-1), and the Arrhenius dependence of D on temperature can be described as D = 4.9×10~(-3) exp(-430000/RT) m~2/s. The diffusion temperature has an important influence on silicon diffusion coefficient. As the diffusion temperature increases, silicon diffusion coefficient is also gradually increasing.
机译：通过液相硅化技术制备了Mo基体上的MoSi_2功能梯度涂层。 SEM，GDS和XRD分析表明，梯度层中的硅含量以三个变化规律出现。沿着Mo基板到涂层表面，梯度涂层的相组成如下：Mo→过渡层Mo（主相）+ Mo_3Si + Mo_5Si_3→中间层MoSi_2→表面层MoSi_2（主相）+ Si。根据Si-Mo扩散偶和Arrhenius方程，得到活化能（Q）为430 kJ·mol〜（-1），D对温度的Arrhenius依赖性可以描述为D = 4.9×10〜（ -3）exp（-430000 / RT）m〜2 / s。扩散温度对硅扩散系数具有重要影响。随着扩散温度的升高，硅的扩散系数也逐渐增大。

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  • 来源
    《High temperature materials and processes》 |2014年第5期|421-426|共6页
  • 作者

    Ying-Yi Zhang; Yun-Gang Li; Xue-Feng Shi; Yuan-Hong Qi;

  • 作者单位

    State Key Laboratory of Advanced Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081, China;

    College of Metallurgy and Energy, Hebei United University, Tangshan 063009, China;

    State Key Laboratory of Advanced Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081, China;

    State Key Laboratory of Advanced Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081, China;

  • 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);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    liquid-phase siliconizing; Arrhenius; diffusion coefficient; activation energy;

    机译：液相硅化阿累尼乌斯;扩散系数活化能;

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