Soft magnetic iron powder core manufactured by aluminum coated oxidation method

Abstract

The invention discloses a soft magnetic iron powder core manufactured by an aluminum coated oxidation method. The soft magnetic iron powder core is characterized in that a pure aluminum layer or an aluminum iron alloy coated layer containing a small amount of iron is coated on iron-based soft magnetic powder quickly; the layer is formed into a good-quality oxidation film through the oxidation method, thereby reducing the eddy loss; after the product is formed by pressing, a heat treatment is carried out on the oxidation film at a relatively high temperature to finish an alloying treatment and an annealing treatment, thereby reducing the magnetic hysteresis loss; and a main process of the soft magnetic iron powder core comprises the following five steps: the first step: producing the iron-based soft magnetic powder; the second step: coating the aluminum on the iron-based soft magnetic powder quickly; the third step: forming the aluminum oxidation film; the fourth step: forming by pressing; and the fifth step: performing the alloying treatment and the annealing treatment.

Description

technical field [0001] The invention relates to a method for manufacturing soft magnetic insulating powder and soft magnetic powder core, in particular to a method for manufacturing soft magnetic insulating powder and soft magnetic powder core by an aluminum coating oxidation method. Background technique [0002] Soft magnetic powder core is a powdery soft magnetic material that is insulated and coated, then solidified with a binder, or soft magnetic material formed by hot pressing. It is an important category of soft magnetic materials. Its performance depends on four aspects. The properties of the soft magnetic matrix material, the particle size and shape of the soft magnetic particles, the properties of the insulation coating, the pressing forming process, and the annealing treatment process, among which the insulation coating and heat treatment process are the most critical links for improving the performance of the soft magnetic powder core. Magnetic material coating me...

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Problems solved by technology

[0002] Soft magnetic powder core is a powdery soft magnetic material that is insulated and coated, then solidified with a binder, or soft magnetic material formed by hot pressing. It is an important category of soft magnetic materials. Its performance depends on four aspects. The properties of the soft magnetic matrix material, the particle size and shape of the soft magnetic particles, the properties of the insulation coating, the pressing forming process, and the annealing treatment process, among which the insulation coating and heat treatment process are the most critical links for improving the performance of the soft magnetic powder core. Magnetic material coating method and main features: ① phosphating film formed by mixing phosphate or phosphoric acid as the main material with iron-based particles; ② resin coating using hydrate and hydrolysis polymerization, and direct polymer coating ; ③ with Al 2 o 3 and SiO 2 Equal oxide powder or oxide colloid coating (8) Use two soluble substances to mix with iron-based particles and react to form oxides that are adsorbed on the surface of iron-based particles to coat; Among them, the annealing temperature of type ① and ② generally does not exceed 500 °C, and the maximum does not exceed 600 °C. The annealing effect is not good, and the hysteresis loss of the iron powder core is high. Type ③ is difficult to form a thin and uniform insulating layer; ④ A complete oxide film cannot be formed due to the low content of silicon and aluminum

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