Solid sealing method of combined non-solid tantalum capacitor for spacecraft

Abstract

The invention provides a solid sealing method of a combined non-solid tantalum capacitor for a spacecraft. The method comprises the following steps: uniformly mixing epoxy resin, a diluent, a curing agent and a filler to prepare a solid sealing material: providing a capacitor shell and a capacitor shell upper opening, enabling a plurality of tantalum capacitor monomers to be electrically connected in series, in parallel or in series and parallel to form a tantalum capacitor assembly, putting the tantalum capacitor assembly into the capacitor shell, and then pouring a sealing material into the capacitor shell in multiple times, wherein the interval time between the two adjacent pouring processes of the sealing material is longer than 10 minutes; and solidifying the sealing material in the capacitor shell to obtain the combined non-solid tantalum capacitor. According to the technical scheme of the invention, the diluent, the curing agent and the filler are doped into the epoxy resin so that the flowability of the solid sealing material is improved, the solid sealing material is poured for multiple times under the vacuum condition, and the solid sealing material is cured in three different temperature intervals after being poured so that residual air can be thoroughly escaped, and bubbles are prevented from being generated in a capacitor product.

Description

technical field [0001] The invention relates to the technical field of preparation technology of electronic components, in particular to a solid-sealing method for a combined non-solid tantalum capacitor used in spacecraft. Background technique [0002] At present, high-voltage, large-capacity capacitors are indispensable in energy storage circuits and filter circuits of various electronic equipment. Combined non-solid electrolyte tantalum capacitors are widely used due to their small size, high voltage, large capacity, small leakage current, low loss, good storage stability, excellent frequency characteristics, and can withstand large ripple currents. in the aerospace industry. Combined non-solid electrolyte tantalum capacitors are made of multiple air-sealed non-solid electrolyte tantalum capacitors that are connected in series, parallel or mixed and sealed in a metal case with epoxy resin to make them have a larger capacity. Higher high pressure performance. However, i...

AI Technical Summary

Problems solved by technology

However, in the process of pouring epoxy resin, due to the extremely small distance between the individual non-solid electrolyte tantalum capacitors, the fluidity of the epoxy resin is poor. A large number of air bubbles affect the overall sealing performance of the product. When the poorly sealed combined non-solid electrolyte tantalum capacitor is put into the application of the spacecraft, when the spacecraft enters the low-temperature and high-vacuum environment of outer space, the air bubbles may burst, and there are The humid gas gradually overflows through the micropores of the epoxy resin, which may easily cause the capacitor components to be partially damp and short-circuited or even fail, thus affecting the normal operation and service life of the spacecraft.

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