Multi-layer electrical support substrate

摘要

To prevent defoliation or splitting-off of an aluminum or aluminum alloy which is roll-plated on a copper or copper alloy base, an intermediate nickel layer having less than 0.05% contaminants is applied beneath the aluminum layer. If the base is a copper alloy, an intermediate copper layer which is of an oxygen-free copper or copper alloy is placed between the base and the nickel layer. Typical dimensions are: base copper layer (1, 13): 0.25 mm; oxygen-free copper layer (7, 15): 0.005 to 0.01 mm; nickel layer with less than 0.05% contaminants or impurities: about 0.01 mm; AlSi 0.5 aluminum alloy: 0.005 to 0.006 mm.