Preparation method of a high DC bias characteristic sendust magnetic powder core

A high DC bias, sendust technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems that conventional sendust magnetic powder cores cannot meet low loss, and achieve improved DC bias characteristics, improving out-of-synchronization problems, and eliminating the effect of stress concentration

CN102945720BActive Publication Date: 2016-08-03GUANGZHOU DELOOP ELECTRONICS DEVICES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-08-03
Patent Text Reader

Abstract

The invention discloses a preparation method of a sendust core with a high direct current bias characteristic. The preparation method comprises the following steps of (1) core powder preparation, (2) passivating treatment, (3) compression moulding and (4) heat treatment, wherein low-hardness plastic metal powder is mixed into sendust in Step (1); a passivant is added to the prepared core powder for the passivating treatment in Step (2); an adhesive agent, an insulating agent and a lubricant are successively added to the mixed metal powder subjected to the passivating treatment, and then the compression moulding is conducted in Step (3); and annealing treatment is conducted on the sendust core subjected to compression moulding at 600-700 DEGC for 0.5-2h in Step (4). The preparation method has the benefits that the core powder formula is improved, the density of the sendust core is increased and the uniformity of air gap distribution is improved, so that the direct current bias characteristic of the sendust core is improved, and the problem that the conventional sendust core cannot work under the condition of low loss and high direct current bias characteristics is solved.
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Description

technical field

[0001] The invention relates to a preparation method of a high DC bias characteristic sendust magnetic powder core, belonging to the technical field of electronic information materials. Background technique

[0002] Due to its high energy conversion efficiency and high stability, modern switching power supplies are widely used in various active electrical appliances, such as computers, LED TVs, communication hardware, and household appliances. It can be said that it has become an indispensable key equipment for modern life and production.

[0003] The reason for its high efficiency lies in the widespread use of metal-oxide-semiconductor field-effect transistors on the one hand, which reduces the power loss caused by the "on" and "off" states of traditional switching devices and the electrical inertia; The important reason is that the capacitance and inductance are effectively used together, so that energy can be effectively transferred in the circuit. [00...

Examples

Embodiment 1

[0024] A method for preparing a high DC bias characteristic sendust magnetic powder core, which comprises the following steps:

[0025] (1) Prepare powder core powder: mix low-hardness plastic metal powder into sendust metal powder, so that the metal powder is evenly distributed in sendust powder, wherein, sendust metal powder and low-hardness plastic metal powder are calculated according to weight The ratio is 100:1 to prepare, take -200 mesh sendust metal powder 500g, low hardness plastic metal powder 5g;

[0026] (2) Passivation treatment: add a passivating agent to the prepared powder core powder for passivation treatment, and the amount of passivating agent is 0.1% of the weight of the powder core powder;

[0027] (3) Compression molding: add binder, insulating agent, and lubricant to the mixed metal powder after passivation treatment, and then press molding under a pressure of 1750MPa. The amount of binder is 0.5% of the weight of the powder core powder , the amount of ...

Embodiment 2

[0036] A method for preparing a high DC bias characteristic sendust magnetic powder core, which comprises the following steps:

[0037] (1) Prepare powder core powder: mix low-hardness plastic metal powder into sendust metal powder, so that the metal powder is evenly distributed in sendust powder, wherein, sendust metal powder and low-hardness plastic metal powder are calculated according to weight The ratio is 100:1 to prepare, take -200 mesh sendust metal powder 500g, low hardness plastic metal powder 5g;

[0038] (2) Passivation treatment: add a passivating agent to the prepared powder core powder for passivation treatment, and the amount of passivating agent is 0.1% of the weight of the powder core powder;

[0039] (3) Compression molding: add binder, insulating agent, and lubricant to the mixed metal powder after passivation treatment, and then press molding under a pressure of 800MPa. The amount of binder is 0.5% of the weight of the powder core powder , the amount of i...

Embodiment 3

[0052] A method for preparing a high DC bias characteristic sendust magnetic powder core, which comprises the following steps:

[0053] (1) Prepare powder core powder: mix low-hardness plastic metal powder into sendust metal powder, so that the metal powder is evenly distributed in sendust powder, wherein, sendust metal powder and low-hardness plastic metal powder are calculated according to weight Ratio 100:0.1 to prepare, take -200 mesh sendust metal powder 500g, low hardness plastic metal powder 0.5g;

[0054] (2) Passivation treatment: add a passivating agent to the prepared powder core powder for passivation treatment, and the amount of passivating agent is 0.1% of the weight of the powder core powder;

[0055] (3) Compression molding: add binder, insulating agent, and lubricant to the mixed metal powder after passivation treatment, and then press molding under a pressure of 1750MPa. The amount of binder is 0.5% of the weight of the powder core powder , the amount of ins...