放电等离子原位烧结制备TiC+TiB/Ti复合材料

In-Situ Synthesis TiC+TiB/Ti Composites by Spark Plasma Sintering

采用放电等离子烧结(SPS),通过Ti与B4C之间的原位反应合成TiC+TiB/Ti复合材料。首先通过热力学计算判断可能发生的反应,利用X射线衍射(XRD)、扫描电镜(SEM)对球磨混合粉以及烧结后材料的相组成和显微组织进行了研究,测定材料的相对密度和硬度,并探讨了Ti与B4C采用放电等离子烧结制备TiC+TiB/Ti复合材料的致密化过程和反应机理。结果表明,采用SPS技术,在1150℃保温5min的条件下,Ti与B4C能同步完成反应、烧结、致密化,生成TiC+TiB/Ti复合材料,并且原位生成的增强相分布均匀且细小。

The TiC＋TiB/Ti composites were prepared through the synthesis reaction between Ti and B4C by means of Spark Plasma Sintering （SPS）. The possibility of the chemical reaction between Ti and B4C was confirmed by thermodynamic analysis. The phases and microstructures of the ball-milled powder and in-situ synthesis composites were identified by X-ray diffraction and Scanning electron microscopy. The relative density and hardness were measured. The densification and reactive mechanism of the TiC＋TiB/Ti composites prepared by SPS technique were discussed. The results show that synchronous completing of the reaction, sintering and densification can be done and the TiC＋TiB/Ti composites can be fabricated by means of the reactive sintering method in a relatively short time （5 min） and at lower temperature （1150℃）, the reinforcements are fine and distributed uniformly in the matrix.