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鋁熱自蔓延法制備低氧高鈦鐵合金及表征
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國(guó)家自然科學(xué)基金項(xiàng)目(50874027;50644016;50704011);國(guó)家“973”項(xiàng)目(2007CB613504);中央高?;究蒲袠I(yè)務(wù)費(fèi)資助(N090402015)


Preparation and Characterization of High Titanium Ferrous with Low Oxygen Content by Thermit Reduction-SHS
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    摘要:

    以金紅石、鈦精礦、Al為原料采用鋁熱自蔓延法制備出低氧高鈦鐵。研究相關(guān)反應(yīng)體系的熱力學(xué)及動(dòng)力學(xué)問題,考察配料比、熔渣類型、發(fā)熱劑等對(duì)鋁熱自蔓延過程的影響,采用XRD,SEM以及化學(xué)分析等技術(shù)對(duì)高鈦鐵合金進(jìn)行表征。結(jié)果表明:反應(yīng)體系的絕熱溫度大于1800 K,反應(yīng)能自我維持進(jìn)行;Al還原TiO2反應(yīng)的表觀活化能為93.676 kJ·mol-1,反應(yīng)級(jí)數(shù)為0.01,Al還原TiO2和Fe2O3的表觀活化能為300.740 kJ·mol-1,反應(yīng)級(jí)數(shù)為1.20;合金主要由TiFe2、TiFe以及Fe2TiO0.13等鈦鐵低氧固溶體相組成,夾雜相存在是導(dǎo)致合金中氧含量高及微觀缺陷存在的直接原因;合金中鈦、鋁、鐵、硅含量分別為:60.0%~62%、7.0%~11.0%、21.0%~25.0%以及3.0%左右;合金中的氧被有效去除,最低為1.85%。

    Abstract:

    Rutile, ilmenite and Al powder were used to prepare high titanium ferrous alloy by thermit-SHS(self -propagating high-temperature synthesis) reduction method. The thermodynamic and dynamic of the relative reaction systems were studied. The effects of charge ratio, slag type and heating agent on the thermit-SHS reduction process were investigated and the high titanium ferrous alloys were characterized by XRD,SEM and chemical compositions analysis technologies. The results indicate that the adiabatic temperatures of all reaction systems are higher than 1800 K, so all of the reactions can be kept up by self. The apparent activation energy is 93.676 kJ·mol-1 and reaction order is 0.01, the apparent activation energy for Al reducing TiO2 and Fe2O3 is 300.740 kJ·mol-1 and the reaction order is 1.20. The high titanium ferrous alloys consist mainly of TiFe2, TiFe and Fe2TiO0.13 ilmenites solid solution with low oxygen content. The oxide inclusions exist in the alloy which results directly in the high oxygen content and micro-structural defects in the alloys. The contents of titanium, aluminum, ferrous and silicon in the alloy are 60.0%-62%, 7.0%-11.0%, 21.0%-25.0% and 3.0% about, respectively. The lowest oxygen content in the alloy is 1.85% which is removed effectively.

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豆志河,張廷安,張含博,張志琦,牛麗萍,赫冀成.鋁熱自蔓延法制備低氧高鈦鐵合金及表征[J].稀有金屬材料與工程,2012,41(5):899~904.[Dou Zhihe, Zhang Tingan, Zhang Hanbo, Zhang Zhiqi, Niu Liping, He Jicheng. Preparation and Characterization of High Titanium Ferrous with Low Oxygen Content by Thermit Reduction-SHS[J]. Rare Metal Materials and Engineering,2012,41(5):899~904.]
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  • 收稿日期:2011-05-15
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