Synthesis of Al/TiC-Al₂O₃ nanocomposite by mechanical alloying and subsequent heat treatment

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• 作者：M. Zarezadeh Mehrizi ; R. Beygi ; Gh. Eisaabadi
• 关键词：Al/TiC&ndash ; Al2O3 ; Mechanical alloying ; Milling time ; Heat treatment
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 May 2016
• 年：2016
• 卷：42
• 期：7
• 页码：8895-8899
• 全文大小：1644 K

文摘

In this study, Al/TiC–Al₂O₃ nanocomposite was synthesized via mechanical alloying and heat treatment. Phase development and structural changes were studied by X-ray diffraction technique and field-emission gun scanning electron microscopy. The results showed that the phase evolutions during mechanical alloying were strongly dependent on milling time until 20 h by formation of Al₃Ti and Al₂O₃. After that, by increasing milling time, no new phases formed. Heat treatment of 60 h milled powder showed that no new phases (especially TiC) were found after annealing at 500 °C. But increasing temperature to 1000 °C caused the Al₃Ti and TiO₂ peaks disappeared and TiC peaks emerged. These results confirmed that the formation of TiC is not feasible in an Al–TiO₂–C system with excess Al by mechanical alloying.