W含量及预热温度对Ti—W—C体系燃烧合成产物的影响研究

Study on The Effect of Tungsten Content and Preheat Temperature on Combustion synthesized Product in Ti-W-C System

摘要:

研究了W含量及预热温度对Ti-W-C体系燃烧合成产物相组成及粉末形貌的影响。研究结果表明，体系W含量减少，或燃烧之前进行预热，通过提高体系的燃烧温度，其燃烧反应机制由扩散－固溶机制转变为熔化－溶解－析出机制；结果，燃烧反应随之完全,有利于合成单相（Ti,W)C粉末，且产物粉末粒度增加，同时合成单相所需的预热温度随W含量增加而提高。

Abstract:

The effect of W content and preheat temperature on phase components and powder size of combustion synthesized product in Ti W C system were studied. With the decrease of W content, the combustion temperature is increased and the combustion reaction mechanism is changed to melt solution prepicitation from diffusion solution in solid state. Preheating mixtures would result in the same effect. As a result, the combustion reaction becomes complete, single phase (Ti, W)C is synthesized advantageously and the powder size increases with the decrease of W content and the increase of preheat temperature. Meanwhile, the necessary preheat temperature for synthesizing single phased(Ti, W)C increases with the increase of W content.