Production of scandium and Al-Sc alloy by metallothermic reduction
Production of scandium and Al-Sc alloy by metallothermic reduction
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DOI：
10.1179/174328508x290876
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发表时间：
2008-01-01
期刊：
影响因子：
--
通讯作者：
Okabe, T. H.
中科院分区：
文献类型：
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作者：
Harata, M.;Nakamura, T.;Okabe, T. H.
对一种通过氧化钪（Sc₂O₃）的钙热还原生产金属钪（Sc）或铝 - 钪（Al - Sc）合金的新工艺进行了基础研究。在本研究中，铝（Al）和氯化钙（CaCl₂）分别用作还原的收集金属和助熔剂。将氧化钪、铝和氯化钙的混合物置于钽坩埚中，再将钽坩埚放入不锈钢反应容器内，原料混合物在1273 K下与钙（Ca）蒸气反应6小时。还原实验后，通过水溶液浸出从所得合金样品中去除反应产物（CaO）、CaCl₂助熔剂和过量的钙还原剂。通过X射线衍射和电子探针分析证实了合金的铝基体相中Al₃Sc的形成。这一结果表明，在还原过程中，Sc₂O₃成功地被还原为金属Sc，并原位合金化形成液态Al - Sc合金。当在还原实验中不使用铝时，形成了一种复合氧化物（CaSc₂O₄），且还原不完全。本研究表明，可以使用CaCl₂助熔剂和铝收集金属通过钙热还原直接生产Al - Sc合金。
A fundamental study was conducted on a new process for producing scandium (Sc) metal or aluminium-scandium (Al-Sc) alloy by the calciothermic reduction of scandium oxide (Sc2O3). In this study, aluminium (Al) and calcium chloride (CaCl2) were used as the collector metal and flux for the reduction respectively. A mixture of Sc2O3, Al and CaCl2 in a tantalum crucible was placed inside a stainless steel reaction container, and the feed mixture was reacted with calcium (Ca) vapour at 1273 K for 6 h. After the reduction experiment, the reaction product (CaO), CaCl2 flux and excess Ca reductant were removed from the obtained alloy sample by leaching with an aqueous solution. The formation of Al3Sc in the Al matrix phase of the alloy was confirmed by Xray diffraction and electron microprobe analysis. This result indicates that Sc2O3 was successfully reduced to metallic Sc and alloyed in situ to form liquid Al-Sc alloy during the reduction. When Al was not used in the reduction experiment, a complex oxide (CaSc2O4) was formed, and the reduction was incomplete. This study demonstrates that the Al-Sc alloy can be directly produced by calciothermic reduction using CaCl2 flux and Al collector metal.