Copper-based bonding wire and preparation method thereof
A bonding wire and copper-based technology, which is applied in semiconductor/solid-state device manufacturing, electrical components, circuits, etc., can solve problems such as easy oxidation of bonding copper wires, low bonding production efficiency, and increased number of wire changes. Competitiveness, convenient transportation, effect of improving bonding strength
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Embodiment 1
[0038] A copper-based bonding wire is a composite material composed of copper wire and a gold layer wrapped on the surface of the copper wire. In the material, copper is the base material, and its purity is higher than 99.99%. The mass ratio of gold is 2%. The purity is higher than 99.99%.
[0039] The diameter of the bonding wire is 50 microns, and the thickness of the gold-plated layer is 0.25 microns.
[0040] The preparation process of copper-based bonding wire is as follows:
[0041] Step 1, prefabricating copper rod blanks. The copper material with a purity of more than 99.99% is melted at a high temperature in a furnace with a vacuum degree of 0.001Mpa, the melting temperature is kept at 1100°C, and the refining time is 55 minutes. During the melting process, high-purity argon is used to protect it, and finally it is prepared by solidification. The diameter is 8 mm copper rod stock;
[0042] Step 2, prefabricating thin copper wires. The above-mentioned copper rod bl...
Embodiment 2
[0056] A copper-based bonding wire is a composite material composed of copper wire and a gold layer wrapped on the surface of the copper wire. In the material, copper is the base material, and its purity is higher than 99.99%. The mass ratio of gold is 5%. The purity is higher than 99.99%.
[0057] The diameter of the bonding wire is 50 microns, and the thickness of the gold-plated layer is 0.6 microns.
[0058] The copper-based bonding wire preparation process is:
[0059] Step 1, prefabricating copper rod blanks. The copper material with a purity of more than 99.99% is melted at a high temperature in a furnace with a vacuum degree of 0.008Mpa, the melting temperature is kept at 1100°C, and the refining time is 60 minutes. During the melting process, high-purity argon is used to protect it, and finally it is prepared by solidification. The diameter is 8 mm copper rod stock;
[0060] Step 2, prefabricating thin copper wires. The above-mentioned copper rod blank with a diam...
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