| 摘要 |
A bonding wire comprises a core wire generally made of silver or a silver alloy, and the coating material is selected from one or more of: gold, palladium, platinum, rhodium. Alternatively, the core wire is generally made of copper or a copper alloy, and the coating material is selected from one or more of: palladium, platinum, rhodium, iridium, ruthenium. For both core wires, the coating material can be selected from a group of materials with the following characteristics: (1) the materials' melting temperature is higher than the melting temperature of the core wire material, respectively; (2) the materials' molten surface tension is higher than that of the core wire material, respectively; (3) the materials show a high resistance to oxide formation between the melting temperature of the core wire material and the melting temperature of the respective material itself; and (4) the coating material has the additional characteristic that the material's melting temperature is lower than the boiling temperature of the core wire material. |
