Iron-based magnetic powder with double coating layers as well as preparation method and application of iron-based magnetic powder

A double-cladding and cladding technology, applied in the field of metal soft magnetic powder cores, can solve the problems of overall temperature rise and performance degradation of magnetic powder cores, and achieve the effects of energy saving, environmental protection, mass production, improved solubility, and low energy consumption.

Pending Publication Date: 2022-06-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, despite the phosphating treatment, SiO 2 Insulation treatments such as coating and water glass coating can greatly reduce the loss of the magnetic powder core, but the copper loss and iron loss of the magnetic powder core are still unavoidable, and the excessive loss will cause the overall temperature of the magnetic powder core to rise during use, which will lead to Performance degradation of powder cores

Method used

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  • Iron-based magnetic powder with double coating layers as well as preparation method and application of iron-based magnetic powder
  • Iron-based magnetic powder with double coating layers as well as preparation method and application of iron-based magnetic powder
  • Iron-based magnetic powder with double coating layers as well as preparation method and application of iron-based magnetic powder

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Effect test

Embodiment 1

[0064] The present embodiment provides a method for preparing a magnetic powder core, comprising the following steps:

[0065] 1) Phosphating treatment: Weigh phosphoric acid, acetone and reduced carbonyl iron powder in a mass ratio of 7:200:1000 and mix them, and heat to 40°C while mechanically stirring at a rotational speed of 200 r / min until the acetone is completely volatilized, then Set it to dry at 120 °C for 1 hour, and sieve it with a 200-mesh sieve to obtain iron-based magnetic powder with a phosphate coating layer;

[0066] 2) Preparation of bismaleimide resin solution: put bismaleimide resin and dimethylformamide in a container according to the ratio of 40:100 and mix, and then according to acetone and bismaleimide resin The mass ratio of 40:1 is to get acetone and add it to the container, and use mechanical stirring to mix completely to obtain a bismaleimide resin solution (that is, a coating agent);

[0067] 3) resin coating treatment; the bismaleimide resin in s...

Embodiment 2

[0070] The present embodiment provides a method for preparing a magnetic powder core, comprising the following steps:

[0071] 1) Phosphating treatment: Weigh phosphoric acid, acetone and reduced carbonyl iron powder in a mass ratio of 7:200:1000 and mix them, and heat to 40°C while mechanically stirring at a rotational speed of 200 r / min until the acetone is completely volatilized, then Set it to dry at 120 °C for 1 hour, and sieve it with a 200-mesh sieve to obtain iron-based magnetic powder with a phosphate coating layer;

[0072] 2) Preparation of bismaleimide resin solution: put bismaleimide resin and dimethylformamide in a container according to the ratio of 40:100 and mix, and then according to acetone and bismaleimide resin The mass ratio of 40:1 is to get acetone and add it to the container, and use mechanical stirring to mix completely to obtain a bismaleimide resin solution (that is, a coating agent);

[0073] 3) Resin coating treatment; step 2) the bismaleimide re...

Embodiment 3

[0076] The present embodiment provides a method for preparing a magnetic powder core, comprising the following steps:

[0077] 1) Phosphating treatment: Weigh phosphoric acid, acetone and reduced carbonyl iron powder in a mass ratio of 7:200:1000 and mix them, and heat to 40°C while mechanically stirring at a rotational speed of 200 r / min until the acetone is completely volatilized, then Set it to dry at 120 °C for 1 hour, and sieve it with a 200-mesh sieve to obtain iron-based magnetic powder with a phosphate coating layer;

[0078] 2) Preparation of bismaleimide resin solution: put bismaleimide resin and dimethylformamide in a container according to the ratio of 40:100 and mix, and then according to acetone and bismaleimide resin The mass ratio of 40:1 is to get acetone and add it to the container, and use mechanical stirring to mix completely to obtain a bismaleimide resin solution (that is, a coating agent);

[0079] 3) resin coating treatment; the bismaleimide resin in s...

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Abstract

The invention discloses iron-based magnetic powder with double coating layers as well as a preparation method and application of the iron-based magnetic powder. The iron-based magnetic powder with the double coating layers comprises an iron-based magnetic powder inner core, a phosphate coating layer and a bismaleimide resin coating layer from inside to outside. The preparation method of the iron-based magnetic powder with the double coating layers comprises the following steps: 1) dispersing the iron-based magnetic powder into a phosphoric acid solution, and carrying out surface modification to obtain the iron-based magnetic powder with a phosphate coating layer; and 2) dispersing the iron-based magnetic powder with the phosphate coating layer into a bismaleimide resin solution, and carrying out surface coating to obtain the iron-based magnetic powder with double coating layers. A magnetic powder core prepared from the iron-based magnetic powder with the double coating layers has the advantages of being good in heat resistance, low in loss and low in preparation cost.

Description

technical field [0001] The invention relates to the technical field of metal soft magnetic powder cores, in particular to an iron-based magnetic powder with double cladding layers and a preparation method and application thereof. Background technique [0002] Magnetic powder core is a new type of soft magnetic material obtained by using soft magnetic magnetic powder as raw material, coating insulating material on the surface of magnetic particles through insulation treatment to obtain insulating magnetic powder, and then using powder metallurgy process to press the powder into the desired shape. Widely used in low, medium and high frequency AC devices in energy, information, transportation, national defense and other fields, such as power transformers, inductors, inverters and filters. [0003] With the rise of the new energy industry, electronic devices are gradually developing in the direction of high frequency and miniaturization, and the extreme working temperature of el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/26H01F41/02H01F3/08
CPCH01F1/26H01F41/026H01F41/0266H01F3/08
Inventor 余红雅关少聪刘仲武袁涵
Owner SOUTH CHINA UNIV OF TECH
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