Sintering method for improving mechanical strength of tantalum wire

Abstract

The invention discloses a sintering method for improving the mechanical strength of a tantalum wire, which comprises the following steps of: taking the metal which is lower in melting point and is easy to have a reaction with water or acid by itself or oxide of the metal as deoxidant, and jointing sintering with the pressed tantalum wire under the vacuum state, so that the oxidized part of the tantalum wire is deoxidized, and continuously heating under the vacuum state to sinter the tantalum wire and crystallize the tantalum wire after the deoxygenation is completed, so that the mechanical strength of the tantalum wire can be improved. The specific technical scheme of the sintering method comprises the following steps of: firstly putting the metal deoxidant and a container which is to be filled with the tantalum wire to be sintered such as a tantalum crucible into a vacuum film plating device, heating under the vacuum state, so that the metal deoxidant is evaporated, and forming a layer of metal film on the surface of the container filled with the tantalum wire by the metal deoxidant after cooling; and putting the tantalum wire into a film-plated container to be sintered in the vacuum sintering furnace.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a sintering method for improving the mechanical strength of tantalum wire. Background technique [0002] Tantalum wire is a necessary part for connecting with tantalum electrolytic capacitors and soldering tantalum electrolytic capacitors on printed boards. The specific volume of tantalum powder is getting higher and higher, and the particles are getting smaller and smaller, so the degree of oxidation of tantalum powder is becoming more and more serious when it absorbs oxygen in the air. The flow of the molten layer on the surface of adjacent tantalum powder particles is reduced, and the mutual crystallization ability is reduced, thereby reducing the mechanical strength of the tantalum wire. The specific performance is that the tantalum wire breaks or falls off from the tantalum capacitor when it is slightly stressed. Taking the tantalum wire bent 90° and returning to it...

AI Technical Summary

Problems solved by technology

Taking the tantalum wire bent 90° and returning to its original position as an experiment, the current tantalum wire on the market is broken after an average of less than 1.5 times of bending, which seriously affects the use

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