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Mechanism of combustion synthesis of TiC-Fe composites under the action of an electric field

机译：电场作用下TiC-Fe复合材料燃烧合成机理

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摘要

The combustion synthesis process of the 55 wt-%(Ti + C)-45 wt-%Fe system was studied under two different fields. The simplex thermal field was provided by differential scanning calorimeter and high temperature X-ray diffraction equipment, while the electric field was generated by a Gleeble thermal simulation instrument. With the aid of an electric field, the system is able to be ignited at 394°C, which is much lower than the ignition temperature of above 920°G required if only a simplex thermal field is used. This is because solid diffusion among reactant atoms could be accelerated at a lower temperature by the coeffect of an electric field and the self-generated thermal field. Microstructure study revealed the formation of instantaneous liquid phase in microzones during combustion. A four step model describing the mechanism for the combustion synthesis of TiC-Fe composites under an electric field is also proposed.
机译：在两个不同的领域研究了55 wt％（Ti + C）-45 wt％Fe系统的燃烧合成过程。单纯热场由差示扫描量热仪和高温X射线衍射仪提供，而电场由Gleeble热模拟仪产生。借助于电场，该系统能够在394°C的温度下点火，该温度远低于仅使用单工热场所需的高于920°G的点火温度。这是因为通过电场和自生热场的共同作用，可以在较低的温度下促进反应物原子之间的固体扩散。微结构研究揭示了燃烧过程中微区中瞬时液相的形成。提出了描述电场作用下TiC-Fe复合材料燃烧合成机理的四步模型。

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