Suppression of the SHS reactions during synthesis of porous FeAl intermetallics by introducing silicon

Suppression of the SHS reactions during synthesis of porous FeAl intermetallics by introducing silicon
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引入硅抑制多孔 FeAl 金属间化合物合成过程中的 SHS 反应

DOI:
10.1016/j.jallcom.2017.11.291
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发表时间:
2018-02
影响因子:
6.2
通讯作者:
Yuehui He
Yuehui He
中科院分区:
材料科学2区
文献类型:
--
作者:
Huibin Zhang;Wei Xie;Haiyan Gao;Weijun Shen;Yuehui He

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提出了一种通过引入Si来抑制多孔FeAl金属间化合物自蔓延高温合成反应的新方法。研究了Si含量为1- 5wt%的Fe/Al/Si压坯的放热行为、显微组织和相组成,以探讨Si影响Fe-Al系扩散反应的机理。结果表明,Si在Fe-Al界面的偏聚抑制了Fe/Al/Si复合材料的相互扩散和反应速度,避免了Fe-Al反应的强烈放热。最终烧结后,多孔FeAl金属间化合物可以实现扩散均匀化。Si在防止SHS反应中的有益作用已在FeAl过滤元件的工业制造中得到进一步验证。
A novel method for suppressing the Selfpropagating High-temperature Synthesis (SHS) reactions during synthesis of porous FeAl intermetallics by introducing silicon (Si) was proposed. The exothermic behaviors, microstructures and phase compositions of Fe/Al/Si compacts with a content of 1–5 wt% Si were investigated to gain an insight into the mechanism of Si for influencing the diffusion reactions in Fe-Al system. The results showed that the interdiffusion and reaction velocities of Fe/Al/Si compacts were restrained due to the segregation of Si in the Fe-Al interface, which could avoid the intensive heat release from Fe-Al reactions. After final sintering, diffusional homogenization of porous FeAl intermetallics could be achieved. The beneficial effect of Si in preventing SHS reactions has been further verified in the industrial manufacturing of FeAl filter elements.
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