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Iron powder surface coating processing method

A technology of surface coating and treatment method, applied in the field of surface coating treatment of iron powder, can solve the problems of easy brittle cracking of the coating layer, no major progress, complicated preparation process, etc. simple effect

Inactive Publication Date: 2014-06-18
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are more or less problems in the preparation of coated iron powder by the above methods, such as the coating layer is easy to be brittle, the coating is uneven, the preparation process is complicated, and the efficiency is low.
So far, no significant progress has been made in the application of this type of research in the domestic industry. It is very necessary to further explore the preparation method of coated iron powder with simple process and excellent performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw material iron powder is high-purity atomized iron powder, and its concentration is controlled at 0.2g / ml. A certain amount of phosphoric acid is added to acetone to make a phosphating solution. The concentration of phosphoric acid is controlled at 0.008g / ml, and the iron powder is added to the phosphating solution. The solution was mechanically stirred at room temperature (20°C) for 30 minutes, filtered and washed with acetone for 3 times, and then fully dried at 50°C. Then take a certain amount of 3-aminopropyltriethoxysilane and add it to a mixed solution of absolute ethanol and 5% deionized water for hydrolysis to form a silane treatment solution. The silane concentration is controlled to be 0.01g / ml, and the above phosphating Iron powder was added to the treatment solution at room temperature (20°C) and stirred mechanically for 120 minutes, filtered and washed with absolute ethanol, and then placed at 80°C to fully dry to obtain atomized iron powder with a do...

Embodiment 2

[0022] The raw material iron powder is iron-6.5 silicon alloy powder, and its concentration is controlled to be 2g / ml. A certain amount of phosphoric acid is added to acetone to make a phosphating solution. The concentration of phosphoric acid is controlled to be 0.01g / ml, and the iron powder is added to the phosphating solution. Mechanically stir the reaction at 30°C for 60 minutes, filter and wash with acetone for 3 times, and then fully dry at 50°C. Then take a certain amount of 3-aminopropyltrimethoxysilane and add it to a mixed solution of absolute ethanol and 5% deionized water for hydrolysis to form a silane treatment solution, control the silane concentration to be 0.1g / ml, and mix The powder was added to the treatment solution with mechanical stirring at 50°C for 60 minutes, filtered and washed with anhydrous ethanol, and then fully dried at 120°C to obtain a coated iron-silicon alloy powder with a double-layer structure of phosphate layer and siloxane layer.

Embodiment 3

[0024] The raw material iron powder is carbonyl iron powder, and its concentration is controlled to be 0.1g / ml. A certain amount of phosphoric acid is added to acetone to make a phosphating solution. The concentration of phosphoric acid is controlled to be 0.002g / ml, and the iron powder is added to the phosphating solution for 50 °C mechanically stirred for 15 min, filtered and washed with acetone for 3 times, and then dried fully at 50 °C. Then take a certain amount of 3-aminopropyltriethoxysilane and add it to a mixed solution of absolute ethanol and 5% deionized water for hydrolysis to form a silane treatment solution. The silane concentration is controlled to be 0.2g / ml, and the above phosphating Iron powder was added to the treatment solution with mechanical stirring at 70°C for 30 minutes, filtered and washed with absolute ethanol and then fully dried at 100°C to obtain a coated carbonyl iron powder with a double-layer structure of phosphate layer and siloxane layer.

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Abstract

The invention relates to an iron powder surface coating processing method and belongs to the technical field of functional material and powder metallurgy. The process comprises the following steps of: placing iron powder in phosphorizing liquid, stirring for 15 to 60min at a temperature of 20 to 50 DEG C, and filtering, washing and drying; then placing the obtained product in silane treating fluid, stirring for 30 to 120min at a temperature of 20 to 70 DEG C, filtering and washing; and finally, drying at a temperature of 50 to 120 DEG C to obtain coated powder of which the surface is simultaneously provided with a phosphate layer and a siloxane layer. The method adopts the simple preparation process, has high efficiency, is complete to coat, is easy to form the industrial scale; the phosphate coating layer on the surface has high resistivity and can effectively reduce magnetic loss of an iron powder core; and the siloxane coating layer can improve brittleness of the phosphate layer and can improve heat resistance of the coated iron powder.

Description

technical field [0001] The invention belongs to the technical field of functional materials and powder metallurgy, and in particular relates to a surface coating treatment method of iron powder. Background technique [0002] The soft magnetic powder core is manufactured by powder metallurgy technology. It is composed of iron-based powder particles with a coating layer on the surface. It can be pressed into parts with complex shapes in one step, and has good three-dimensional isotropic magnetic properties and thermal characteristics, and can be used at medium and high frequencies. The lower eddy current loss can be used as iron core material in some motors with complex shapes and magnetic circuits and motors operating at higher frequencies. It has been widely used and can bring revolutionary changes to the design of power motors. With the development of miniaturization and high frequency of electronic devices, micro-motors, low-power motors and anti-electromagnetic interferen...

Claims

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Application Information

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IPC IPC(8): B22F1/00H01F1/33
Inventor 李发长李一柳学全李楠丁存光李金普李立鑫
Owner CENT IRON & STEEL RES INST
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