Method for improving performance of tantalum powder, tantalum powder and tantalum capacitor anode block prepared from the tantalum powder

Abstract

The invention relates to the technical field of tantalum capacitors, in particular to a method for improving the performance of tantalum powder and the tantalum powder and the tantalum capacitor anode block prepared by the tantalum powder, which are prepared by mixing stearic acid, polyethylene glycol and a solvent to prepare a modified liquid Finally, the amount of mixing and preparation is limited, so that after being added to the tantalum powder, the fluidity of the tantalum powder can be effectively improved, the consistency of the prepared tantalum block is better, the forming efficiency of the tantalum block is improved, and the contact between the tantalum block and the tantalum block is reduced. The mold friction damage rate improves the qualified rate of tantalum block and production efficiency, and there is no volatilization of any bad atmosphere.

Description

technical field [0001] The invention relates to the technical field of tantalum capacitors, in particular to a method for improving the performance of tantalum powder, the tantalum powder and a tantalum capacitor anode block prepared from the tantalum powder. Background technique [0002] The production of the anode tantalum block of tantalum capacitor mainly adopts the compression molding process. During the compression molding process, a certain proportion of binder needs to be added to improve the fluidity of the tantalum powder, and the mold cavity can be uniformly filled during compression molding. , to reduce the powder weight deviation between the formed tantalum blocks; at the same time, it can also improve the lubrication of the tantalum powder, reduce the friction between the forming mold and the tantalum powder, prolong the service life of the mold, and reduce the scratches on the surface of the tantalum block; After the tantalum block is formed, the adhesive can ...

AI Technical Summary

Problems solved by technology

[0003] The commonly used binders for tantalum powder used in traditional tantalum capacitors are camphor, stearic acid, polyethylene glycol, etc. Among them, camphor is the most commonly used, but camphor is easy to volatilize and its performance is unstable, which makes the tantalum block processing process difficult. The peculiar smell is strong, and it is easy to pollute the environment; at the same time, the purity of camphor is low, because after mixing tantalum powder, a large amount of impurities are introduced, which reduces the electrical performance of tantalum capacitors, and after camphor and tantalum powder are mixed, the fluidity of tantalum powder is poor, forming The weight deviation of tantalum block is large, and the consistency of tantalum block production is poor

Stearic acid has a good lubricating effect, and after being mixed with tantalum powder, its fluidity is better. For this reason, in the prior art, some researchers use stearic acid and tantalum powder for mixed treatment, such as the patent No. 201310493371.3 "Improve Tantalum Capacitor Manufacturing Method of Porosity of Anode Block ", in its step (2) mixing powder, respectively weigh polyvinyl alcohol powder type pore opening agent and lubricant with 0.1% to 1% of tantalum powder weight, and add tantalum powder; but, in When the specific volume of tantalum powder is low, the tantalum powder will be treated with stearic acid mixed with tantalum powder, which will lead to a large bulk density of tantalum powder, many faults during pressing and molding, and low production efficiency

Polyethylene glycol has adhesive properties. In the prior art, some researchers use it as a binder for tantalum powder, such as the patent No. 201310493333.8 "Manufacturing method of tantalum capacitor to improve fluidity of tantalum powder during preparation" In the powder mixing step of step (2), put the tantalum powder into the polyethylene glycol solution, stir evenly with a stainless steel rod, add deionized water, and stir for 10 to 15 minutes to allow the tantalum powder to disperse evenly in the solution, so that the tantalum powder The outer layer of the powder particles can form a uniform adhesive layer; however, the fluidity after the powder mixing treatment is poor, and the consistency of the pressed molded product is poor

[0004] In summary, camphor as an additive in the process of improving tantalum powder cannot meet the requirements of the product, and in the prior art, stearic acid and polyethylene glycol are used in the process of improving tantalum powder. After treatment, the modified tantalum powder still has many disadvantages, so that when the tantalum powder is used to prepare the anode block of tantalum capacitor, it still faces low production efficiency, short service life of the mold, and the weight of the same batch of products. big deviation etc.

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