Synthesis of TiC–TiB–TiB2 composite powders by solid reaction of powders

In the present work, TiC–TiB–TiB2 diffusion-layer-coated B4C composite powders were synthesised via a powder immersion method using Ti and B4C powders as reactants. The phase compositions and microstructure of the treated powders were characterised by employing X-ray diffraction and scanning electron microscopy. No significant reaction between B4C and Ti could be detected at 800°C. After treatment at 900°C, the products generated were composed of TiC and TiB. After treatment at 1000°C, the products generated were primarily composed of TiC and TiB, with a small amount of TiB2. The composition and proportions of the produced phases varied with process temperatures and the composition of the initial powders used. Powder mixtures with a Ti/B4C molar ratio of 3.5:1 and treated at 1000°C for 14 h were more suitable for synthesis of TiC–TiB–TiB2-coated B4C composite powders.

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