Surface-mounted tantalum insulator shell and preparation method thereof

Abstract

The invention relates to the technical field of insulators, and particularly provides a surface-mounted tantalum insulator shell and a preparation method thereof. The preparation method specifically comprises the following steps: explosive cladding, multi-pass rolling and vacuum annealing treatment are performed on a tantalum plate and a nickel plate to obtain a tantalum-nickel composite plate; the nickel layer of the tantalum-nickel composite plate is in contact with the female die, the tantalum layer of the tantalum-nickel composite plate is in contact with the male die, punching is conducted, and small holes are punched in the bottom to obtain a shell; glass, the composite tantalum wire and the shell are assembled and then subjected to high-temperature sintering, and an insulator shell is obtained; a nickel tube sleeves on the composite tantalum wire below the bottom of the shell, and the nickel tube and the composite tantalum wire are fixed by adopting a laser welding method to obtain an insulator shell with the nickel tube; and the shell bottom of the insulator shell with the nickel tube is immersed into the lead-tin solder to obtain the surface-mounted tantalum insulator shell. According to the surface-mounted insulator shell, the weight of the tantalum capacitor can be reduced, the cost is saved, the production efficiency is improved, and the assembly reliability and long-term stability are improved.

Description

technical field [0001] The invention relates to the technical field of insulators, and specifically provides a surface-mounted tantalum insulator shell and a preparation method thereof. Background technique [0002] Insulators are key accessories installed between conductors of different potentials or between conductors and ground potential. They can protect the interior of components from damage, provide insulation for the two poles of components, and reduce or reduce the voltage of components Mechanical stress, which is a key part of components, can play an important role in the work and use of components. Insulators should not fail due to various components caused by changes in environmental and electrical load conditions, otherwise the insulator will not produce If it does not play an important role, it will damage the service life and operating life of the whole machine equipment. [0003] At present, the shell and cover of tantalum capacitors are made of pure tantalum...

AI Technical Summary

Problems solved by technology

[0002] Insulators are key accessories installed between conductors of different potentials or between conductors and ground potential. They can protect the interior of components from damage, provide insulation for the two poles of components, and reduce or reduce the voltage of components Mechanical stress, which is a key part of components, can play an important role in the work and use of components. Insulators should not fail due to various components caused by changes in environmental and electrical load conditions, otherwise the insulator will not produce important role, it will damage the service life and operating life of the whole equipment

[0003] At present, the shell and cover of tantalum capacitors are made of pure tantalum. There are three difficulties in the current processing process that have not been effectively solved: (1) Tantalum is a powder metallurgy material, which is processed by plastic deformation such as stamping and stretching. During the process, its crystal grains will increase, resulting in a sharp increase in the surface hardness of the material, and the hardening phenomenon of the material is much more serious than other materials, which reduces the yield of the product and makes it difficult to guarantee the dimensional consistency of the product; (2) Tantalum belongs to the face center It has a hexagonal structure, and not only is it easy to drop particles during processing, but the tantalum also has adhesion problems with the mold material, resulting in defects such as scratches and pits on the surface after the stretching is completed; (3) The electrical connection method between tantalum and the outside is to use In order to weld nickel wire on tantalum, due to the difference in expansion coefficient and melting point between nickel wire and tantalum, nickel wire often detaches from tantalum insulator, thus affecting the reliability of the whole machine

The wettability of tantalum materials and lead-tin alloys is poor, resulting in poor solderability of tantalum, which leads to the fact that capacitors processed with tantalum cannot be directly welded to circuit boards: (4) In the use of capacitors with tantalum insulators, usually use Bolt installation is used to solve the fixing and installation of capacitors, which requires additional auxiliary parts, such as fixing brackets, bolts, nickel tubes, etc., which not only increases costs and reduces reliability, but is also very unfavorable for the space application of the whole machine, especially aerospace field

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