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2023-05-10
Reliability Study on Lead Bonding of Ni Co Alloy+Au Coated Ceramic Shell
In order to improve the high-temperature discoloration resistance, corrosion resistance, and long-term storage ability of the ceramic shell coating, the ceramic shell with metal parts needs to adopt a Ni Co+Au coating structure with a Co content of 20%~40%. The coating is annealed. The influence of Ni+Au coating and Ni Co+Au coating structure on the reliability of aluminum wire wedge welding and gold wire ball welding was studied and analyzed. The lead bonding strength changes after storage at room temperature, 300 ℃ for 1 hour, and 300 ℃ for 24 hours, Quantitative comparison of element surface distribution on the bonding surface. The experiment shows that the Ni+Au and Ni Co+Au plating structures have no significant impact on the bonding strength and reliability of the lead wire; There is no need to make significant adjustments to the bonding process parameters for the two types of plated shell structures during bonding; Aluminum wire is bonded on Ni Co+Au coating structure and Ni+Au coating structure, and gold aluminum intermetallic compounds will be generated at the bonding interface. However, as long as the thickness of the gold layer is controlled, no gold aluminum intermetallic compounds will be generated; Kirkendall" Failure, relatively speaking, the defect density of Ni Co+Au plating structure is lower, and the process of generating gold aluminum intermetallic compounds is slower