中文摘要：

采用自蔓延冶金法制备了TiB2微粉．对相关的反应体系进行了DTA分析，并采用XRD、扫描电镜以及粒度分布技术对燃烧产物及浸出产物进行了分析和表征．结果表明：Mg-B2O3．TiO2之间的反应为固-液-液-固反应机制；燃烧产物主要有TiB2和MgO，以及少量的Mg2TiO4和Mg3B2O6等相组成；随着压样压力增加，TiB2颗粒变小，添加MgO，TiB2颗粒亦减小，添加TiB2，TiB2颗粒则明显增大．结合扫描电镜分析了燃烧产物的微观结构以及微观区域形成的原因，确定了TiB2生长机制为一种在颗粒间生长，另一种在颗粒内部形成．

英文摘要：

TiB2 powder was prepared by SHS-metallurgy. The relative reaction systems were analyzed by DTA. The combustion products and leachable products were analyzed and characterized by XRD, SEM and granularity distribution. The results indicate that SHS reaction of Mg-TiO2-B2O3 system takes place through solid-liquid-liquid-solid reaction process. The combustion products consist of TiB2, MgO and a little Mg2TiO4 ＆ Mg3B2O6. The TiB2 particles become thinner when the sample pressure increases; TiB2 particle becomes thinner when adding MgO to the reaction system and TiB2 particles become bigger when adding TiB2 to the reaction system. The microstructure of combustion products and the forming mechanism of the different micro-regions were analyzed by Micro-region-technology based on SEM. The growth mechanism of TiB2 can be determined that one is growing in particle-particle interfaces and the other is growing within particles.