A device and method for sintering and debindering of tantalum compacts

Abstract

The invention discloses a device for removing the binder and sintering the tantalum compact. The device comprises a heating furnace, a binder recovery box, and a binder recovery box connecting the heating furnace and the binder recovery The ducting of the box, and the vacuum system. The invention also discloses that the tantalum compact mixed with the binder is put into the heating furnace for evacuation and heating, the volatilized binder is recovered through the binder recovery box, and then the temperature is continuously raised to make the tantalum blank block sintering method. The capacitor tantalum block sintered by the device of the invention has low oxygen content, and the tantalum anode manufactured by the device has low leakage current and high yield, and the binder can be recovered for reuse, so that the equipment is kept free from pollution and the environment is purified.

Description

technical field [0001] The present invention relates to a manufacturing method and device for a tantalum electrolytic capacitor, more particularly, the present invention relates to a device and a method for debinding and sintering a compact compacted with tantalum powder. Background technique [0002] One of the main uses of metal tantalum is to make electrolytic capacitors. The first step to make electrolytic capacitors with tantalum powder is to add about 1% to 5% of the mass of tantalum powder to tantalum powder, such as paraffin, camphor, glycerin, polypropylene carbonate and stearic acid. and other binders / lubricants, pressed into tantalum compacts embedded with tantalum wire leads, then debonded, and then sintered into a porous sintered body combined between tantalum powder particles and between tantalum powder and tantalum wire, Then use the tantalum wire as the anode lead to anodize the porous sintered body, form a dielectric oxide film on the outer and outer surface...

AI Technical Summary

Problems solved by technology

In this way, it takes a lot of time to damage the material, and the oxide film on the surface of the tantalum powder particles is destroyed twice to form a thicker oxide film after the surface of the tantalum powder is changed from vacuum high temperature to atmospheric room temperature twice, and the oxygen content of the tantalum powder sintered body is high, making the production The leakage current of the capacitor increases, and the withstand voltage performance is poor

[0003] US5470525 discloses a kind of technology that washes the tantalum compact with 50 ℉~200 ℉~200 ℉ water to wash the tantalum compact and removes the binder. , During the process of washing the tantalum blocks to remove the binder, due to the collision of the tantalum blocks, some tantalum blocks will lose their edges and corners or even be broken, and some tantalum wire leads will become loose, which will affect the yield

[0004] CN105931843 discloses that the tantalum compact is placed in a vacuum drying oven filled with a degreasing agent; then the low-temperature wet catalytic degreasing is carried out; the tantalum metal anode placed in the vacuum drying oven is degreased more than 3 times and then vacuum-dried to remove Binder, this method needs to consume more degreasing agent, and the processing time is long

[0005] CN210435361U discloses a kind of debonding agent and sintering process that finishes in same furnace, but, when this device drove away the binding agent in the tantalum compact with the circulating gas of heating, under inert gas blowing condition, still A lot of pollutants produced by the binder will be deposited on the furnace wall, insulation screen, pipeline and other components in the furnace. The equipment must be cleaned and replaced frequently, and the vacuum system will be polluted; and it will be debonded under inert gas conditions. The binder is not beneficial to debinding under vacuum conditions, and the debinding at low temperature is not clean, and carbon elements will penetrate into the tantalum lattice during high temperature sintering, which seriously reduces the quality of tantalum sintered blocks

[0006] Since the prior art has the problem that debinding and sintering of tantalum briquettes cannot be performed in the same furnace, it is desirable in the art to design a device that can perform debinding and sintering in one device

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