Abstract
It has been established in principle that carbonyl nickel powder can be processed into rod and strip by the technique of plastic working of sintered billets, and an appropriate technological process has been developed. The powder is pressed isostatically under a pressure of 9 kg/mm2 into cylindrical billets, which are then sintered in hydrogen with a dew point between −20 and −30°C at a temperature of 1350°C for 5 h. To obtain sheet, the cylindrical billets are forged over the temperature range 1200-900°C into bars, which are first subjected to surface milling or planing and then to hot and cold rolling into sheet and strip. The resulting strip has high mechanical properties. The yield of sound metal in the processing of the powder to strip is 85%. Further work is in progress on the use of pressed sheet bars, which may be expected to shorten and simplify the fabrication process and raise the yield of sound material to 95%.
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