| 摘要 |
The temperature of a silver wire having undergone final plastic working is increased to a treatment temperature T1 of 700°C or more and less than the melting point of the silver wire. Then, while maintaining the silver wire at the treatment temperature T1 of 700°C or more and less than the melting point, atmosphere exchange is repeated three times or more, in which a vacuum atmosphere is created in the area surrounding the silver wire by evacuation and then helium gas and hydrogen gas are supplied to create a mixed atmosphere. Then, the silver wire is annealed over a time that is at least twice the total time of the time for the temperature increasing step and the time for the heating/maintaining step. This allows the overall structure of the silver wire to be constituted by coarsened, recrystallized grains, and at least either helium molecules or hydrogen molecules are filled in the grain boundaries of the recrystallized grains. Thus high electric conduction efficiency can be imparted to the silver wire. |
