【摘要】 以天然钛铁矿为主要原料,采用燃烧合成技术制备了TiC-Al2O3/Fe3Al金属间化合物/陶瓷基复合材料。研究了预热时间和热处理对燃烧合成过程及产物的影响。研究结果表明随着预热时间的延长,燃烧温度和燃烧波速率都增加,产物晶胞参数增大,合成更为完全,无序固溶相进行有序化转变的程度增大。当预热5min时,Fe3Al有序金属间化合物的量明显高于无序固溶相,但继续延长预热时间很难将无序相消除;在750℃下进行热处理,可以制备出以Fe3Al金属间化合物为主要成分的复合粉体。更多还原

【Abstract】 TiC-Al₂O₃/Fe₃Al compound （I/CMC） is synthesized by combustion synthesis with natural ilmenite as the raw material. The effects of preheating-time and heat treatment on the combustion synthesis process and the products are studied in this paper. It is shown that with the prolongation of the preheating-time, the temperature and the velocity are improved, the crystal-cell parameter are increased and the ordering of alloy phase are also improved. When the preheating-time is up to 5 minutes, the content of ordered Fe₃Al intermetallic is higher than the disordered which is difficult to eliminate even with longer proheatingtime. The compound powders with Fe₃Al intermetallic base can be prepared through heat treatment at 750℃.更多还原