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Deoxidaton of Rare Earth Metals by Halide Flux Treatmwent

卤化物助熔剂处理稀土金属脱氧

基本信息

批准号：
09650806
负责人：
FUJISAWA Toshiharu
金额：
$ 2.43万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

1.Preliminary Experiments by Various Halide FluxesPreliminary deoxidation experiments were conducted by using several kind of halide fluxes. Based on the above results, effect of used fluxes on deoxidation ability was investigated and effectiveness of this method was confirmed.2.REF_3 - RE-oxide (RE=Nd, Pr) Quasi-binary EquilibriumREF_3 powder and a RE-oxide pellet were charged in a graphite crucible and heated at 1723 K under argon atmosphere for a scheduled time period. Then, the crucible was pulled out from the furnace and quenched rapidly by jetting helium gas. Two phases, consisting of the melted part and the solid part, were observed in both experiments and the both were subjected to X-my diffraction analysis. The NdOF or PrOF peaks are detected in the both parts.3.RE - REF_3 - RE_20_3 Quasi-ternary SystemAs the REOF phases were identified, new sets of experiments were conducted to determine the RE - REF_3 - REOF quasi-ternary equilibrium. Using those results and the partial phase diagrams of the RE-O system, phase diagrams of the RE - REF_3 - RE_20_3 quasi-ternary system at 1723 K were established. Based on the phase diagrams, deoxidation reactions on the both rare earth metals were estimated.4.Deoxidation ExperimentsThe deoxidation experiments using NdF_3 or PrF_3 as a halide flux were performed in order to confirm the estimated deoxidation reactions. Oxygen content can be successfully lowered by the halide flux treatment. Therefore, the halide flux treatment is not only simple process but also effective deoxidation method.

1.不同卤化物熔剂的初步试验采用几种卤化物熔剂进行了初步脱氧试验。在此基础上，研究了所用熔剂对脱氧能力的影响，并证实了该方法的有效性。2. REF_3-RE-氧化物（RE=Nd，Pr）准二元平衡REF_3粉末和RE-氧化物颗粒装入石墨坩埚中，在氩气气氛下于1723 K加热预定的时间。然后，将坩埚从炉中拉出并通过喷射氦气快速淬火。在两个实验中都观察到由熔融部分和固体部分组成的两相，并且两者都进行了X-my衍射分析。在这两个部分中都检测到NdOF或PrOF峰。3. RE-REF_3-RE_2O_3准三元体系当REOF相被鉴定时，进行新的实验组以确定RE-REF_3- REOF准三元平衡。利用这些结果和RE-O系的部分相图，建立了RE-REF_3-RE_2O_3准三元系在1723 K的相图。4.脱氧实验为了验证所预测的脱氧反应，分别用NdF_3和PrF_3作为卤化物熔剂进行了脱氧实验。卤化物助熔剂处理可以成功地降低氧含量。因此，卤化物熔剂处理不仅工艺简单，而且是一种有效的脱氧方法。