What is the difference between oil-immersed foil capacitors and metallized capacitors?

Update:15,Nov,2021
Summary:What are oil-immersed foil capacitors and metallized capacitors? What are their ...
What are oil-immersed foil capacitors and metallized capacitors? What are their main differences and advantages and disadvantages? Which capacitor is more suitable? What is the basis?






First. From the main materials:
1. The main materials of oil-immersed foil capacitors are:
2. Insulation material: full film, paper film composite, impregnating material. The whole film is a single-sided and double-sided roughened polypropylene film, which is a non-polar material. The thickness of the material is generally 7-18μm. The main factors affecting film quality are uniformity and average breakdown field strength. Paper film composite is generally made of polypropylene light film or polyester light film and fiber paper, and its thickness is the same as that of polypropylene material. Capacitor impregnating materials are generally divided into: dodecylbenzene, diarylethane, benzyltoluene and so on.


Second.Electrode plate: special aluminum foil for capacitors. Generally, the thickness of aluminum foil is 6-7μm. The key to the quality of aluminum foil is uniformity and slitting quality.
1. Component lead: lead sheet (copper sheet), paint (tin-zinc solder).
2. Metallized capacitors are divided into metallized paper capacitors (which have been eliminated) and metallized capacitors. The material of the capacitor is:
(1) Insulation material: polypropylene light film, capacitor paper. The thickness of film and paper is generally 5-16μm.
(2) Electrode: A layer of aluminum metal powder with a thickness of about 0.1 μm is vapor-deposited on the surface of polypropylene light film or capacitor paper as an electrode.
(3) Component lead-out pole: spray gold layer at both ends of the component.