Heat sink zinc-based microalloy

Abstract

The invention discloses a heat sink zinc-based microalloy which takes zinc as a matrix and is added with trace calcium and / or tellurium. The heat sink zinc-based microalloy is prepared from the following components in percentage by weight: 0.005 to 0.2 percent of calcium, 0.001 to 0.03 percent of tellurium, less than or equal to 0.02 percent of impurities, and the balance of zinc, wherein the total weight percentage of all the components is 100 percent. When the zinc alloy disclosed by the invention is used for vacuum evaporation coating of a metal thin film, the occurrence rate of the "splashing" defect is low, and the yield is high; and furthermore, the storage time of the evaporation-coated thin film subjected to is longer than that of a conventional pure zinc evaporation-coated thin film.

Description

Technical field: [0001] The invention relates to the field of manufacturing metallized films for capacitors, and more specifically relates to a zinc-based microalloy used for forming a zinc film evaporation layer by vacuum heat sinking on a plastic film. Background technique: [0002] Metallized film capacitors are capacitors made of organic plastic film as a medium and metallized film as an electrode by winding. The organic films used in metallized film capacitors include polyester (PET), polypropylene (PP), Polycarbonate, etc., among which polyester film medium and polypropylene film medium are the most widely used. [0003] Metallized film is one of the key raw materials for manufacturing metallized film capacitors. The metal deposited on the surface of the film has been mainly aluminum for a long time. The adhesion of the aluminum-coated metallized film is relatively good, and the production process is easy to handle. Due to the chemical reaction between the surface of...

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Problems solved by technology

However, compared with aluminum-plated metallized films, there are two problems in metallized zinc film evaporation: (1) the zinc layer can be oxidized into ZnO in a very short time when exposed to the air, which is a semiconductor material, and The density is not high. Under the temperature and humidity conditions, the oxidation of the coating is accelerated, and the entire coating is often completely destroyed within a few days, which brings great inconvenience to storage, transportation and production management; (2) in the process of galvanizing There is a problem of "splashing", that is, a small amount of metal droplets wrapped in oxide slag is sputtered to the surface of the film under the push of zinc vapor, causing the film to melt through, which reduces the yield and the capacity stability of the capacitor

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