Silver alloy wire for bonding applications
A technology for bonding wires and leads, used in welding equipment, metal processing, welding media, etc.
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[0072] The invention is further illustrated by examples. This example serves to illustrate the invention and is not intended to limit the scope of the invention or the claims in any way.
[0073] Alloys were prepared by melting predetermined amounts of pure silver and adding predetermined amounts of pure gold and palladium to obtain a well mixed composition as follows (in weight-%):
[0074] silver gold palladium
[0075] 89% 8% 3%
[0076] The molten mixture was cast and cooled to obtain a lead core precursor. The lead precursor had a diameter of 2 mm.
[0077] The 2 mm diameter lead core precursor was then annealed in an intermediate annealing step. In this step, the core precursor is inserted into an annealing furnace preheated to a temperature of 500°C. Then, the core precursor was kept in the furnace at a constant temperature of 500° C. for an exposure time of 90 minutes.
[0078] This intermediate annealing step was followed by a cooling step with the following par...
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