ゾーン精製による高純度鉄の作製とその純度測定

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High purity iron was manufactured by zone refining under wet and dry hydrogen atmospheres. The original materials were reelectrolytic iron, a common specimen of the Iron and Steel Institute of Japan (specimen number 958, 960), Johnson Matthey iron, and Puron iron. The residual resistivity ratio (RRR) was used to show the purification degree and the longitudinal magneto-resistance effect was investigated at 4.2°K. As one of the physical properties, the thermoelectromotive force (EMF) was studied and the relation between EMF and RRR was investigated. The results were summarized as follows : (1) The slower the travelling rate of zone refining was, the greater the purity of specimen became. (2) The more the number of zone pass was, the greater the zone refining effect became. (3) It was very difficult to eliminate Cu, Co and Ni from the reelectrolytic iron. (4) The value of RRR_min was obtained in the magnetic field of 800∿900 Oe. (5) The value of RRR_min was independent on the electric current in the range from 50 to 450 mA. (6) The non-deoxidated common specimen of the Iron and Steel Institute of Japan was purified by zone refining more than the deoxidated one was. (7) It was effective to anneal the sample at 800℃ in wet hydrogen atmosphere after zone refining. (8) Specimen covered with calcium fluoride was refined by zone melting in wet hydrogen and RRR of its specimen was fairly good. (9) The thermoelectromotive force could be used as one of the methods of the purity measurements when RRR_min was less than 200.
社団法人日本鉄鋼協会の論文
1971-05-01

ゾーン精製による高純度鉄の作製とその純度測定

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