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Process for producing rare earth alloys with very low oxygen content and fine and homogeneous crystal structure by reduction of rare earth oxides
Process for producing rare earth alloys with very low oxygen content and fine and homogeneous crystal structure by reduction of rare earth oxides
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机译:通过还原稀土氧化物生产具有非常低的氧含量和精细而均匀的晶体结构的稀土合金的方法
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摘要
PROBLEM TO BE SOLVED: To manufacture a rare-earths-based alloy of an objective composition, having little content of impurity like oxygen in as-cast condition, a fine and homogeneous crystalline structure, and desired characteristics, while using rare-earth oxides as inexpensive raw materials and recycling expensive rare-earth metal resources. SOLUTION: This method for manufacturing the rare-earths-based alloy by arranging a crucible equipped with a heating device and a rapid cooling solidification means for molten alloy in a sealed chamber, and producing a rapidly cooled and solidified alloy through bringing a molten alloy in the crucible into contact with a rapid cooling solidification means in the sealed chamber of a vacuum or inert gas atmosphere. The method comprises a first step for charging a mixture of a rare-earth oxide powder, a raw material powder consisting of other alloy content powders, and a reducing agent consisting of calcium or hydrogenated calcium powder, into the crucible, a second step for reducing calcium by heating the mixture up to a predetermined temperature in the range between a melting point of calcium (843 deg.C) and 1200 deg.C or lower, a third step for forming a molten alloy and slag by rapidly heating it to a predetermined temperature higher than 1200 deg.C, and a fourth step for rapidly solidifying the molten alloy by bringing the alloy into contact with a cooling roller or disc, while making the alloy flow out of the crucible along with separating it from the slag, after the alloy has reached a predetermined temperature.
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