NdF3-Ca-CaCl2-Fe反応系からのNd-Fe合金の製造におけるCaおよびCaCl2の添加量の影響
NdF3-Ca-CaCl2-Fe反応系からのNd-Fe合金の製造におけるCaおよびCaCl2の添加量の影響
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Ca和CaCl2添加量对NdF3-Ca-CaCl2-Fe反应体系生产Nd-Fe合金的影响
DOI：
10.2473/shigentosozai.110.1203
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
載東 沈
中科院分区：
文献类型：
--
作者：
智永 卞;淵植 金;載東 沈
研究了柱形坩埚尺寸（D/L）、温度、过量金属Ca和盐比对NdF3-Ca-CaCl2-Fe反应混合物制备Nd-Fe合金的影响。由于过量的Ca金属在低碳钢坩埚内壁的蠕变作用，在坩埚底部和沿坩埚外围形成合金。为了减少合金沿边缘的形成并提高工艺效率，发现以下条件是最佳的：(1)D/Lat比值为1.0,(2)温度为860℃左右，(3)Ca过量量为5摩尔%，(4)盐比，即NdF3中每克化学量Nd的cacl2量为1.15。在此条件下，在坩埚底部形成的合金中Nd的回收率为98.5%，合金的重量组成为：铁17.2%，钙0.42%，氧0.02%，碳0.048%，氮<0.01%，氯<0.02%。通过真空电弧熔炼，将少量残余钙去除至微量。
Effects of dimension of a cylindrical crucible (D/L), temperature, excess metallic Ca and salt ratio on the preparation of Nd-Fe alloys from NdF3-Ca-CaCl2-Fe reaction mixtures have been investigated. The alloy was formed on the bottom of the crucible as well as along the periphery due to creeping action of excess Ca metal on the inside wall of the mild steel crucible. In order to minimize the alloy formation along the periphery and to improve the process efficiency, the following condition was found to be optimum:(1) the ratio, D/Lat 1.0, (2) at a temperature of around 860°C, (3) with 5 mole % excess Ca, and (4) salt ratio, the amount of CaCl2per gram of the stoichiometric Nd in the NdF3, at 1.15. Under the above condition, the Nd recovery in the alloy formed on the crucible bottom was 98.5% and composition by weight of the alloy was as follows: 17.2% Fe, 0.42% Ca, 0.02% oxygen, 0.048% C, <0.01% nitrogen and<0.02% chlorine. The small quantity of residual Ca was removed to a trace amount by vacuum arc melting.