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Insulation covering agent of Fe-based soft-magnetic alloyed powder

An insulating coating, soft magnetic metal technology, applied in insulators, inorganic insulators, inorganic materials, etc., can solve the problems of difficulty in forming dense films, affecting the magnetic properties of magnetic powder cores, etc., to improve superposition performance and reduce magnetic loss. Effect

Active Publication Date: 2018-05-08
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that phosphoric acid reacts quickly on the surface of iron-based metal magnetic powder, and it is difficult to form a dense film, which affects the magnetic properties of the magnetic powder core.

Method used

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  • Insulation covering agent of Fe-based soft-magnetic alloyed powder
  • Insulation covering agent of Fe-based soft-magnetic alloyed powder
  • Insulation covering agent of Fe-based soft-magnetic alloyed powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The sendust metal magnetic powder insulation coating agent is weighed according to the mass composition ratio:

[0020] Phosphoric acid 50wt%; manganese dihydrogen phosphate 10wt%; zinc dihydrogen phosphate 20wt%; sodium tripolyphosphate 18wt%; thiourea 2wt%. Add water to dissolve and mix well. Add the sendust powder into the sendust powder according to the mass ratio of the metal magnetic powder at 2.0%, heat and stir until dry. A dense and insulating sendust metal magnetic powder with a cladding layer is obtained. Such as figure 1 shown.

Embodiment 2

[0022] The sendust metal magnetic powder insulation coating agent is weighed according to the mass composition ratio:

[0023] Phosphoric acid 40wt%; aluminum dihydrogen phosphate 25wt%; zinc dihydrogen phosphate 24wt%; sodium pyrophosphate 10wt%; sodium molybdate 0.5wt%; thiourea 0.5wt%. Add water to dissolve and mix well. The coating agent is added to the sendust powder in an amount of 1.8wt% of the total mass of the metal magnetic powder, heated and stirred until dry. A dense and insulating sendust metal magnetic powder with a cladding layer is obtained. Such as figure 2 shown.

Embodiment 3

[0025] The FeSi metal magnetic powder insulation coating agent is weighed according to the mass composition ratio:

[0026] 10wt% phosphoric acid; 25wt% aluminum dihydrogen phosphate; 30wt% zinc dihydrogen phosphate; 30wt% sodium tripolyphosphate; 1wt% sodium molybdate, 4% hexamethylenetetramine. Add water to dissolve and mix well. The coating agent is added to the iron-silicon powder at a mass ratio of 1.0% of the metal magnetic powder, and heated and stirred until dry. A dense and insulating iron-silicon metal magnetic powder with a cladding layer is obtained. Such as image 3 shown.

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Abstract

The invention discloses an insulation covering agent of Fe-based soft-magnetic metallic magnetic powder, and belongs to the technical field of preparation of magnetic materials. The insulation covering agent is formed by phosphoric acid, polyphosphate, dihydric phosphate and an additive, the insulation covering agent comprises following components: 10-50 wt% of phosphoric acid, 30-60 wt% of dihydric phosphate, 10-30 wt% of polyphosphate, and 1-5 wt% of the additive, the additive is one of sodium molybdate, thiourea, and hexamethylenetetramine, the dihydric phosphate is one or two of manganesedihydrogen phosphate, zinc dihydrogen phosphate, and aluminum dihydrogen phosphate; and the polyphosphate is sodium tripolyphosphate or sodium pyrophosphate. The Fe-based soft-magnetic metallic magnetic powder is covered by employing the insulation covering agent, a covering layer is uniform, tight and insulated, and a magnetic powder core with excellent magnetic performance can be obtained.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and in particular relates to an insulating coating agent for iron-based soft magnetic alloy powder. Background technique [0002] Metal soft magnetic powder core is a kind of composite soft magnetic material obtained by mixing soft magnetic alloy powder with insulating agent and binder uniformly, pressing and molding, and heat-treating. Metal soft magnetic powder cores are widely used because of their high magnetic flux density and high magnetic permeability. The role of the metal powder insulating cladding layer on the magnetic powder core is to insulate and adjust the effective magnetic permeability, and the cladding layer is required to have properties such as insulation, compactness, and voltage resistance. [0003] At present, most iron-based metal magnetic powders use phosphoric acid as a coating agent to form a layer of phosphating film on the surface of iron-based m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/00H01B3/02H01F1/24H01F1/26
CPCH01B3/008H01B3/025H01F1/24H01F1/26
Inventor 郑翠红赵利明杨磊方道来雷堃邱佳威
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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