TiN/Al_2O_3 Composite Material Synthesized by Aluminothermic Reduction Process in Reductive Atmosphere

摘要

TiN/Al_2O_3 composite material was prepared by aluminothermic reduction of TiO_2 in coke bed from mixtures of TiO_2 powder and metal Al powder. The phase composition, lattice parameter and micro-structure of products after treatment in different temperatures were analyzed by XRD, SEM. The results show that TiN/Al_2O_3 composite material can be produced in coke bed via aluminothermic reduction reaction. Moreover, the treatment temperature affects the evolution of aluminothermic reaction and morphology of products obviously. The content, grain size and lattice parameter of TiN in products in coke bed increase with the increasing of treatment temperature. Thennodynamically it confirms that metal Al reacts with oxygen in coke bed while it is involved in aluminothermic reduction reaction, and then it causes the lack of Al, which takes part in the aluminothermic reaction leading to a surplus rutile in the products.