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Why do film capacitors need to undergo gold spraying?

Views: 4     Author: Site Editor     Publish Time: 2025-01-16      Origin: Site

    Gold spraying is an extremely important process in the production process of film capacitors. In the past, film capacitor manufacturers generally used quaternary alloys and quinary alloys. However, due to price wars, many film capacitor manufacturers are now starting to use pure zinc gold spraying because it can reduce costs.

 

    What are the disadvantages of using pure zinc gold spraying for film capacitors? Why do film capacitors need to undergo gold spraying? The purpose of gold spraying is to lead out the metal coating on the film through the gold spraying paint to facilitate welding. Because the coating is thin, it cannot be directly welded, and the foil type can be directly welded.

 

    What are the gold spraying materials for film capacitors? Normally, quaternary alloys are used: tin, antimony, copper, and zinc; quinary alloys: tin, zinc, antimony, bismuth, and lead. Using this material, the welding performance and product high-frequency DF are good, the charging and discharging performance is good, the current resistance is strong, and the life is long, but the price is expensive.

 

    Therefore, many film capacitor manufacturers now directly use the lowest-priced pure zinc gold spraying to reduce costs. However, the gold spraying particles are rough, the capacity decays quickly, and the loss is large. If the gold-spraying particles are too coarse, it is easy to damage the film material, and the gold-spraying material is not easy to enter the end face gap, resulting in increased contact loss with the metallized film material.

 

    The thickness of the gold-spraying will also affect the quality of the film capacitor. In order to save costs, some film capacitor manufacturers will also control the thickness of the gold-spraying to save materials. If the gold-spraying layer is too thin, the metallized film material will be damaged during welding, and the performance of the film capacitor will also deteriorate. Under normal circumstances, the thickness of the gold-spraying should reach 0.35MM. If the gold-spraying layer is too thick, it will waste the gold-spraying material and lead to higher costs.


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