INVESTIGATION IN LOW-TEMPERATURE COMBUSTION SYNTHESIS OF Fe-V-C SYSTEM UNDER ELECTRIC FIELD
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摘要: 采用Gleeble热模拟机研究Fe-V-C体系在电场作用下低温燃烧合成过程。通过分析试样在加热升温过程中反映出的升温特点,表明场致发射促进反应物离子或原子在低温下的固相扩散是导致反应发生的关键因素。结合对产物的X射线衍射分析(XRD)、金相观察以及扫描电镜(SEM)等的分析,结果表明:在电场作用下,该体系的反应起始温度较低(740℃左右),且反应较完全,反应后试样的致密性也得到了很大提高,VC颗粒较小且均匀分布在Fe基体中。Abstract: The effect of electric field on low-temperature synthesis of Fe-VC composites in the Fe-V-C system was investigated using Gleeble thermal simulation apparatus. Through analyzing the thermal characteristics of heating up period, a conclusion is obtained that the key reason which causes the diffusion of ion or atom of reactant under low temperature is the field emission. A series of research, such as the X-ray diffraction (XRD) analysis of product, the metallographic observation and scanning electron microscope (SEM), shows that the starting temperature of synthesis reaction is relative low (about 740 ℃) and the system react thoroughly with the effect of electric field. The synthesis reaction makes the sample become more compact, and the VC particles are small and distribute in the Fe base evenly.
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Key words:
- Fe-VC composites /
- combustion synthesis /
- electric field /
- thermal simulation
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