3AlF6-NaCl-KCl電解質體系;鋁熱還原;Al-Ti-Ce中間合金;物相結構;化學成分"/>

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鋁熱還原工藝條件對Al-Ti-Ce中間合金物相結構和合金元素濃度的影響
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廣西有色金屬及特色材料加工重點實驗室

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廣西創(chuàng)新驅動重大專項(AA18118030)；廣西自然科學基金（2019GXNSFAA185013，2017GXNSFAA198206）


Effect of aluminothermic reduction conditions on the phase structure and chemical composition of Al-Ti-Ce master alloy
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School of Resources,Environment and Materials,Guangxi University

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    摘要:

    在Na3AlF6-NaCl-KCl氟氯混合電解質體系中，通過鋁熱還原法以TiO2和CeO2為Ti源和Ce源，制備Al-Ti-Ce中間合金。研究反應時間、反應溫度、電解質構成（Na3AlF6質量百分含量）、K2TiF6添加量四種工藝條件對Al-Ti-Ce中間合金物相結構和合金元素濃度的影響。實驗結果表明，在所有實驗工藝參數范圍內，制備的Al-Ti-Ce中間合金均由ɑ-Al、Al3Ti和Ti2Al20Ce三相構成。制備的最佳單因素工藝參數為：反應時間90 min，反應溫度850℃，Na3AlF6質量百分含量40 %、K2TiF6添加量20 mol%。熱力學分析結果從理論上進一步證明了在實驗條件下幾種主要化學反應的可行性。

    Abstract:

    Al-Ti-Ce master alloy was prepared by aluminothermic reduction of TiO2 and CeO2 in Na3AlF6-NaCl-KCl electrolytic system. The effects of reaction time, reaction temperature, electrolytic composition (mass percent of Na3AlF6) and K2TiF6 dosage on the phase structure and chemical composition of Al-Ti-Ce master alloy were studied, respectively. The experimental results show that there are only three phases in the Al-Ti-Ce master alloy, which are ɑ-Al, Al3Ti and Ti2Al20Ce, at the range of process parameters used in each experiment, and the optimal single-factor parameters in preparing Al-Ti-Ce master alloy by aluminothermic reduction are as follows: reaction time 90 min, reaction temperature 850 ℃, mass percent of Na3AlF6 40 wt%, K2TiF6 dosage 20 mol%. The results of thermodynamic analysis further show that the main several chemical reactions proposed in this study are feasible on the checked experimental conditions.

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李森,高鋒,沈東東,龍文元,李新生,王開拓,王友彬,藤田豐久,韋悅周.鋁熱還原工藝條件對Al-Ti-Ce中間合金物相結構和合金元素濃度的影響[J].稀有金屬材料與工程,2022,51(5):1805~1812.[Li Sen, Gao Feng, Shen Dongdong, Long Wenyuan, Li Xinsheng, Wang Kaituo, Wang Youbin, Toyohisa Fujita, Wei Yuezhou. Effect of aluminothermic reduction conditions on the phase structure and chemical composition of Al-Ti-Ce master alloy[J]. Rare Metal Materials and Engineering,2022,51(5):1805~1812.]
DOI：10.12442/j. issn.1002-185X.20210409

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  • 收稿日期:2021-05-10
  • 最后修改日期:2021-06-02
  • 錄用日期:2021-06-22
  • 在線發(fā)布日期: 2022-06-09
  • 出版日期: 2022-05-30