电场作用下Fe含量对Fe-Ti-C体系低温燃烧合成的影响

Effect of Fe Content on Low Temperature Combustion Synthesis of Fe-Ti-C System Based on Action of Electric Field

采用Gleeble-1500D热模拟机,对电场作用下Fe含量对Fe-Ti-C体系低温燃烧合成过程和产物显微结构特征的影响进行了研究。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;Fe含量越高,其对体系低温燃烧合成过程的影响越大。随Fe含量增加,体系点火温度升高,点火延迟时间缩短,所达到的最高温度也升高;与高温燃烧合成类似,低温燃烧合成的产物由TiC,Fe,少量Fe_2Ti组成;当Fe含量为45％时(质量百分数,下同),产物中的TiC量最多,且颗粒细小。

Using Gleeble-1500D thermal simulation equipment, the effect of Fe content on the low temperature combustion synthesis process of Fe-Ti-C 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 field and great thermal density. Moreover, the effect of Fe on the low temperature combustion synthesis process becomes greater with the increasing of Fe content. And the ignition temperature becomes higher, the delay time of ignition becomes shorter and the highest temperature becomes higher with the increasing of Fe content. Similar to high temperature combustion synthesis, the products of low temperature combustion synthesis consist of TiC, Fe and a litter Fe2Ti. However, the amount of TiC is the greatest and the size of TiC particles is the smallest at 45wt% Fe content.