Method for stabilisation of electrical resistance of platinum wires

摘要

The platinum wires with high structural and resistance stability during long-term using at temperatures up to 1100 DEG C can be obtained by appropriate thermal treatments. The thermal treatments consist of recrystallisation annealing in the apparatus with a temp erature gradient of 21 DEG C/mm to 28 DEG C/mm at a maximum temperature in the apparatus of 1500 to 1750 DEG C under protective argon atmosphere. During recrystallisation annealing the platinum wires are moved at defined withdrawal rate depending on the initial state of material from the region with maximum temperature to a copper chill with a temperature of 20 DEG C.