PURPOSE: To obtain the title copper having low electric resistance and excellent workability at extra low temp. by regulating from impurities, oxygen impurities and other inevitable impurities to the optimum amounts.
CONSTITUTION: Iron impurities and oxygen impurities are independently regulat ed to ≤1ppm and ≤5ppm and the total of other inevitable impurities is regulat ed to ≤10ppm to obtain high purity oxygen-free copper having ≤2×10-9Ω.cm electric resistance of ≤20K. The high purity oxygen-free copper furthermore has excellent heat conductivity and workability as well as electric resistance at extra low temp. and in the magnetic field. In this way, the high purity oxygen-free copper is suitable as a stabilizing material for a super conductive body used for manufacturing a super conductive magnet.
FUTAMURA YOSHINORI
SAKAI SHUJI
SUGAYA KAZUO
OUCHI YUTAKA
HITACHI CABLE
| JPS56139643A | 1981-10-31 |
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