电场作用下压力对Fe-Ti-C体系低温燃烧合成的影响

采用Gleeble 1500D热模拟机，对电场作用下压力对55％（wt）（Ti＋C）-45％（wt）Fe体系低温燃烧合成过程和产物显微结构特征的影响进行研究。结果表明，在电场和大热流密度作用下，体系的点火温度可以大幅降低，当压力为0～6MPa时，点火温度在310～464℃范围内。压力对体系的低温燃烧合成有较大影响，在加热过程中施加一较小的压力，不仅可以降低点火温度，还能获得细小的TiC颗粒；而过高的压力将会导致点火温度的提高，且所获得的TiC颗粒有所增大。压力对体系点火延迟时间的影响规律与点火温度相同，而对体系所达到的最高温度影响相对较小；但压力对燃烧合成产物的相组成影响不大，都由Fe、TiC和少量Fe2Ti组成。

Effect of Pressure on Low Temperature Combustion Synthesis of Fe-Ti-C System Under the Action of Electric Field

Using Gleeble 1500D thermal simulation equipment, the effect of pressure on the low temperature combustion synthesis process of 55%(wt)(Ti C)-45%(wt)Fe system and microstructure features of the products were studied in this study. The results show that the ignition temperature of Fe-Ti-C system can be decreased greatly under the action of electric fields and great thermal density. The pressure has large effect on the synthesis reaction, a small pressure will cause the decreasing of ignition temperature and small size of TiC, but excessive high pressure will cause the increasing of ignition temperature and big size of TiC. Moreover, the effect of pressure on the delay time of ignition is similar to the ignition temperature, and the effect of pressure on the highest temperature is small relatively. However, the pressure has a little influence in products, all of them consist of Fe, TiC and a little Fe_2Ti.