论文部分内容阅读
采用自蔓延高温合成新技术合成ＴｉＣ／Ｆｅ复合材料，研究了原料组份、粒度对合成过程及产物特征的影响．探讨了燃烧反应及结构形成机理结果表明，随Ｆｅ含量的增大，燃烧合成温度降低，合成ＴｉＣ粒度变细，燃烧波速度在Ｆｅ含量为１０％（质量分数）时出现极大值．与碳黑作碳源对比，细粒石墨在反应合成过程中表现出更大的活性．用钢楔块燃烧波淬息法研究了合成过程，整个合成过程经历了金属的熔融、碳向熔融体中的溶解扩散、大团聚的形成、小的 ＴｉＣ。颗粒生长及ＴｉＣ长大等阶段。
TiC / Fe composites were synthesized by a new self-propagating high-temperature synthesis technology. The effects of raw materials and particle size on the synthesis process and product characteristics were studied. The combustion reaction and the mechanism of formation of the structure were discussed. The results show that with the increase of Fe content, the combustion synthesis temperature decreases and the grain size of the synthesized TiC becomes smaller. The combustion wave velocity reaches its maximum when the Fe content is 10% (mass fraction). Compared with carbon black as a carbon source, the fine graphite shows more activity in the reaction synthesis process. The steel wedge combustion wave quenching method was used to study the synthesis process. The whole synthesis process underwent the melting of metals, the diffusion of carbon into the melt, the formation of large agglomeration, and the small TiC. Particle growth and growth of TiC and other stages.