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CaH2-TiO2-Al體系制備TiAl合金反應(yīng)機(jī)制的探討
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Discussion on Reaction Mechanism of TiAl Alloy Prepared in CaH2-TiO2-Al System
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    摘要:

    通過(guò)熱力學(xué)計(jì)算可知，在CaH2-TiO2-Al體系中用還原擴(kuò)散法制備TiAl合金是可能的。該反應(yīng)為一級(jí)反應(yīng)，采用液-固未反應(yīng)核模型探討其反應(yīng)機(jī)制。結(jié)果表明，TiO2還原成純金屬Ti非常迅速，不是反應(yīng)的控制步驟，界面化學(xué)反應(yīng)為反應(yīng)的控制環(huán)節(jié)。反應(yīng)的表觀活化能為76.84 kJ·mol-1。當(dāng)CaH2的量為理論計(jì)算量的1.5倍時(shí)反應(yīng)充分；Al粉的粒度對(duì)反應(yīng)沒(méi)有影響；反應(yīng)溫度為1423 K、反應(yīng)時(shí)間為8 h時(shí)，TiAl合金的轉(zhuǎn)化率接近100%。

    Abstract:

    It is possible on thermodynamics to prepare TiAl alloy in CaH2-TiO2-Al system by Reduction-Diffusion method. It is a first-class reaction, whose mechanism was discussed by liquid-solid contracting core model. Results show that TiO2 is reduced to Ti rapidly, which is not the rate-controlling step of the reaction. The interfacial chemical reaction is the rate-controlling step of the reaction. The apparent activation energy of the reduction-diffusion reaction is 76.84 kJ/mol. There is sufficient reaction when the entering quantity of CaH2 is 1.5 times of theoretic quantity. Al powder granularity doesn’t influence the reaction. The transformation efficiency of TiAl alloy is about 100% when the reaction temperature is 1423 K and the reaction time is 8 h.

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郭廣思,胡 艷,成永君,胡小媚. CaH2-TiO2-Al體系制備TiAl合金反應(yīng)機(jī)制的探討[J].稀有金屬材料與工程,2009,38(12):2151~2154.[Guo Guangsi, Hu Yan, Cheng Yongjun, Hu Xiaomei. Discussion on Reaction Mechanism of TiAl Alloy Prepared in CaH2-TiO2-Al System[J]. Rare Metal Materials and Engineering,2009,38(12):2151~2154.]
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  • 收稿日期:2008-11-20
  • 最后修改日期:2009-06-02
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