| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 144175 | Advanced Powder Technology | 2014 | 7 Pages |
•MA of 3Ti–2B4C and 3Ti–3B4C systems led to the formation of B4C–TiB2–TiC composite.•All four reactions in this work took place in the gradual mode.•DTA analysis confirmed that the Ti–B4C reaction was in the gradual mode.•The formation of TiC phase occurred before TiB2 formation during MA process.
In this study, the B4C–TiB2–TiC composite powder was synthesized by mechanical alloying (MA) of Ti–B4C powder mixture. For this purpose, four powder mixtures of Ti and B4C powders with different molar ratios were milled. In order to study the mechanism of Ti–B4C reaction during milling, structural changes and thermal analysis of powder particles were studied by X-ray diffractometry (XRD) and differential thermal analysis (DTA). Morphology and microstructure of powder particles during milling were studied by scanning electron microscopy (SEM). It was found that during MA, after decomposition of the outer layers of B4C particles, first, C reacted with Ti and after that, B was diffused in Ti structure and TiC and TiB2 phases were formed in gradual reaction mode. Also, the results of DTA and thermodynamic analysis confirmed the suggested mechanism for Ti–B4C reaction.
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