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Impurity effects on the environmental stability of powder processed intermetallic alumino-silicide compounds

机译：杂质对粉末加工的金属间铝硅化物化合物的环境稳定性的影响

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摘要

The evolution of nearly dense stoichiometric silicide compacts via powder processing is presented in this paper. For specific single-phase Mo(Si,Al)2 compacts, room-temperature environmental degradation, phenomenologically similar to the pesting behavior of binary MoSi2 was observed. This degradation occurs over a series of a few months and results in grain boundary decohesion, which leads to crumbling of polycrystalline compacts in air at room temperature. Auger electron spectroscopy, transmission electron microscopy, and energy dispersive spectroscopy of the boundaries revealed the presence of an array of lens-shaped particles each comprised of silicon carbide and aluminum. The reaction of these phases with atmospheric species was accelerated by the presence of humidity. The trace presence of carbon was unavoidable due to the use graphite pressing dies. Alloying additions were made to tie up carbon by forming more stable carbides while maintaining the desired matrix phase stoichiometry. The pest phenomenon and alloying remedy were proven applicable to other silicide systems through experimentation and ThermoCalc modeling.
机译：本文介绍了粉末加工过程中近致密化学计量硅化物压坯的演变。对于特定的单相Mo（Si，Al）2压块，在室温环境下降解，在现象学上类似于二元MoSi2的有害行为。这种降解会持续数月之久，并导致晶界脱粘，从而导致室温下空气中的多晶压坯破碎。边界的俄歇电子能谱，透射电子显微镜和能量色散能谱表明存在着一系列由碳化硅和铝组成的透镜状颗粒。湿气的存在促进了这些相与大气物质的反应。由于使用了石墨压模，因此不可避免地存在痕量的碳。进行合金添加以通过形成更稳定的碳化物同时保持所需的基质相化学计量关系来束缚碳。通过实验和ThermoCalc建模，已证明该有害生物现象和合金补救措施适用于其他硅化物系统。

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  • 来源
    《Journal of Materials Research》 |2005年第10期|p.2691-2704|共14页
  • 作者

    P.O. Eason; M.J. Kaufman;

  • 作者单位

    e4 Consulting, Inc., Jacksonville, Florida 32256;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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