The invention discloses a tantalum capacitor manufacturing method for improving flowability of tantalum powder in the preparation process. The method includes the steps: (1) preparing aqueous binder solution; (2) mixing the powder; (3) spray drying: pouring tantalum powder mixed liquor into a feeder of a spray drying granulator and performing secondary granulation to obtain near-spherical tantalum powder; (4) performing compression molding; (5) removing binders: boiling and washing a tantalum anode block in deionized water at the temperature of 40-60 DEG C, repeatedly cleaning the tantalum anode block for 2-3 times, taking out the tantalum anode block and drying the tantalum anode block in a drying box at the temperature of 80-90 DEG C for 30-60 minutes. The tantalum capacitor manufacturing method has the advantages that the flowability of the tantalum powder in the preparation process is improved by the aid of the water-soluble binders through secondary granulation in spray drying, the tantalum powder with a high specific volume is uniform in pressed density in the tantalum block molding process, the machining requirement of uniform weight of the tantalum block is met, currently used organic solvents are replaced, industrial pollution is decreased, and the method is suitable for industrial mass production.

Tantalum capacitor manufacturing method for improving flowability of tantalum powder in preparation process

The invention discloses a manufacturing method for an anode tantalum block of a non-solid electrolyte tantalum capacitor. The manufacturing method comprises the following steps: (1) selecting tantalumpowder used for forming the anode tantalum block; (2) carrying out powder mixing and compression molding on a binding agent used for the tantalum powder; (3) putting the formed anode tantalum block in a presintering furnace for presintering, wherein the presintering temperature is 100+/-20 to 300+/-20 DEG C, and the presintering time is 30+/-10 to 120+/-10 min; and (4) carrying out sintering according to requirements, wherein the sintering temperature is 1200+/-20 to 2050+/-20 DEG C, and the sintering time is 20+/-10 to 60+/-10 min. According to the manufacturing method, under the condition that effective removal of the binding agent is met by the anode tantalum block, the presintering temperature of the anode tantalum block is changed, the oxygen content of the presintered anode tantalumblock is reduced, and the anode tantalum block manufactured through the method can reduce the leakage current value after the non-solid electrolyte tantalum capacitor is formed.

Manufacturing method for anode tantalum block of non-solid electrolyte tantalum capacitor

The invention provides a method for improving surface performance of a molded tantalum block. The method comprises the steps of soaking a tantalum block which is subjected to pressing molding in an organic solvent; adopting high purity water to sustainably spray and clean the tantalum block; placing the tantalum block which is washed clean in an oven to dry the tantalum block, and then cooling down the tantalum block; removing adhesive in the cooled tantalum block and sintering the tantalum block. According to the method for improving surface performance of the molded tantalum block, by soaking the tantalum block which is subjected to pressing molding in the organic solvent and cyclically cleaning the tantalum block with the high purity water and then drying the tantalum block, tantalum powder and residual purities of which the surface topography is destroyed of the tantalum block are removed, the surface impurity content is lowered, and the surface pores are opened at the same time, which is conducive to permeation of an envelope of a manganese nitrate solution; in the soaking and cleaning process, deckle edges and dusting flour break away from a tantalum block main body and are taken away by the solution, and thus the stability of the tantalum block structure is improved. According to the method for improving the surface performance of the molded tantalum block, the operation is simple, the efficiency is high, no complicated equipment is needed, the invested cost is low, and an improved effect of leakage current is obvious.

Method for improving surface performance of molded tantalum block

The invention relates to a method for manufacturing a tantalum capacitor anode block through mixed powder in a thermal field environment and belongs to the technical field of electronic components. The method sequentially comprises the steps of (1) conducting heat treatment on tantalum powder with different mean grain sizes in an inert gas environment at the temperature of 700 DEG C-1400 DEG C for 10min-1h to form clusters; (2) evenly mixing the rough powder cluster binding agent; (3) scattering fine powder clusters on the surfaces of rough powder clusters and evenly mixing; (4) conducting thermal field heating on mixed clusters in the step (3), removing solvent in the binding agent; (5) tiling mixed powder in the step (4) on an opening evaporator boat for drying with a blower; and (6) completing later working procedures according to the existing process. Contraction rate of a compression molded tantalum core after firing is obviously improved, no particle is crushed or blocks a gap, electrostatic capacity of a manufactured capacitor is greatly improved, and leakage current and loss are substantially reduced.

Min Du

Papers

Method for manufacturing tantalum capacitor anode block through mixed powder in thermal field environment