| 摘要 |
PURPOSE:To prevent a reduction in the workability of a gold wire and the break of a chip while a breaking position is fixed constant and the tail residual amount of a ball is made short by a method wherein Ca and Y of a specified amount are respectively added to Au, which contains an unavoidable impurity and has a purity of 99.99 % or higher. CONSTITUTION:A wire is formed by a method wherein Ca of a concentration of 5 to 100 wt. PPm, Y of a concentration of 100 to 500 wt. ppm, Ge of one kind or two kinds of a concentration or concentrations out of a concentration of 30 to 100 wt. ppm and Be of one kind or two kinds of a concentration or concentrations out of a concentration of 5 to 15 wt. ppm are made to contain in high-purity Au. That is, as the Ca has an action to make high a recrystallization temperature at the time of formation of a ball, it has an action to shorten a recrystallization range at the time of formation of the ball, the Y has an action to shorten the recrystallization range at the time of formation of the ball and the Ge and the Be have an action to increase the workability of the wire. Thereby, while a breaking position is fixed constant and the tail residual amount of the ball is made short, a reduction in the workability and the break of a chip can be prevented. |
