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CuO對Ti-C-Al體系自蔓延反應過程的影響

Effect of CuO on the self-propagating reaction process of Ti-C-Al systems

  • 摘要: 選擇Ti-C-Al和Ti-C-Al-CuO兩種體系,采用原位反應近液相線鑄造技術,制備鋁基復合材料.通過金相顯微鏡、掃描電鏡和X射線衍射儀研究了復合材料的微觀組織.對上述兩種體系的反應進行了熱力學與動力學分析.進一步研究了CuO對Ti-C-Al體系的自蔓延反應過程的作用機理,建立了其反應過程的動力學模型.結果表明:在Ti-C-Al體系自蔓延反應過程中,CuO和Al的反應可以提高其反應體系的絕熱溫度,能為該體系反應持續提供熱量,使其自蔓延效果更為顯著,反應更加徹底,大大減少條塊狀的中間產物Al3Ti,優化了材料組織.

     

    Abstract: Aluminum matrix composites were prepared using an in-situ reactive near-liquidus casting technique in two systems of Ti-C-Al and Ti-C-Al-CuO. Their microstructure was studied by optical microscopy, scanning electron microscopy and X-ray diffraction. Thermodynamic analysis on the reaction in the two systems was carried out. The effect of CuO on the self-propagating reaction process of the Ti-C-Al system was discussed, and a kinetic model was set up. It is found that in the self-propagating reaction process of the Ti-C-Al system, the reaction between CuO and Al is able to enhance the adiabatic temperature of the system and provide the system with sustaining heat, making the self-propagating reaction more remarkable and more completed. As a result, blocky Al3 Ti mesophase is extremely decreased, and the microstructure of the composites is optimized.

     

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