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Feed powder for large-size magnetic core and preparation method thereof

A large-size magnetic core technology, applied in the field of large-size magnetic core material powder and its preparation, can solve problems such as insufficient strength, achieve accurate and simple magnetization fluctuations, and fully controllable magnetization fluctuations

Inactive Publication Date: 2017-05-31
SHANGHAI BAOSTEEL MAGNETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a material powder for a large-size magnetic core. The magnetic core produced by the present invention does not produce cracks during the sintering process, and can ensure that the magnetic core does not produce delamination and insufficient strength during pressing.

Method used

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  • Feed powder for large-size magnetic core and preparation method thereof
  • Feed powder for large-size magnetic core and preparation method thereof
  • Feed powder for large-size magnetic core and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 5600kg of raw materials, including 21.84kg of NJ-II PVA particles and 14.46kg of PVA Jinshan particles, which were pre-fired at a temperature of 960°C. as follows:

[0022]

[0023]

[0024] According to the analysis results, the fifth car is removed, and a car with a magnetic susceptibility of 10.0% powder is moved in, and the average difference of the new batch is 0.0129.

Embodiment 2

[0026] Weigh 5600kg of raw materials, including 20.16kg of NJ-II PVA particles and 13.44kg of PVA Jinshan particles, and pre-burn them at a temperature of 960°C. as follows:

[0027]

[0028] According to the analysis results, the average difference is less than 0.015, which meets the production requirements.

Embodiment 3

[0030] Weigh 5600kg of raw materials, including 22.85kg of NJ-II PVA particles and 15.23kg of PVA Jinshan particles, which were pre-fired at a temperature of 960°C. as follows:

[0031]

[0032] According to the analysis results, the average difference is less than 0.015, which meets the production requirements.

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Abstract

The invention relates to a production method of feed powder for a large-size magnetic core. The size of the large-size magnetic core is larger than 40mm. The production method has the advantages that the adding proportion of PVA (Polyvinyl Acetate) is controlled to be between 0.60% and 0.68%, and a mode of compounding PVA particles can be adopted; the fluctuation range of the magnetization degree is reduced by reducing the presintering temperature; the fluctuation of the magnetization degree in batches is controlled by a mode of taking out and putting into all monomers; and the problems of sintering cracking of the large-product magnetic core and poor strength and layering of a green blank and the like can be solved.

Description

technical field [0001] The invention relates to the technical field of magnetic raw materials, in particular to a large-size magnetic core material powder and a preparation method thereof. Background technique [0002] With the development of electronic technology, manganese zinc ferrite core is gradually developing in the direction of miniaturization, light weight and flattening, so now the production process of ferrite powder is also gradually changing in this direction. However, with the rise of the new energy vehicle industry, some large-size magnetic cores are increasingly used in vehicle charging piles. Using powders that have been adapted to miniaturized products for pressing large-size magnetic cores will cause serious sintering cracks. Therefore, it is necessary to redevelop the production process of powders suitable for large-size magnetic cores. [0003] The material powder suitable for small product magnetic cores generally adopts a PVA addition ratio of more th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/634
CPCC04B35/63416C04B2235/95C04B2235/96
Inventor 汤庆利刘伟唐俊睿
Owner SHANGHAI BAOSTEEL MAGNETICS