A kind of insulating coating method and metal powder core prepared according to the method

A technology of insulation coating and metal powder core, applied in the field of metal powder core, can solve the problem of low annealing temperature, achieve the effect of improving strength, heat treatment temperature and reducing loss

Active Publication Date: 2016-03-09
KUNSHAN CITONG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is how to reduce the residual stress of the metal powder core with high hardness and poor plasticity to reduce loss, and how to improve the low annealing temperature of traditional organic high-temperature binders, so as to improve the performance of such high hardness and poor plasticity. In order to improve the strength and performance of the metal powder core, an insulation coating method and a metal powder core prepared according to this method are provided.

Method used

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  • A kind of insulating coating method and metal powder core prepared according to the method
  • A kind of insulating coating method and metal powder core prepared according to the method
  • A kind of insulating coating method and metal powder core prepared according to the method

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Experimental program
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Effect test

Embodiment 1

[0015] The powder of this embodiment is the composition that adopts atomization method preparation to be Fe 80 Si 16 B 4 Iron-based amorphous soft magnetic powder, bismaleimide and silicon oxide are selected as the insulating coating agent, and the mixing ratio of silicon oxide is 0wt%, 0.01wt%, 1wt%, 2wt%, and 5wt%, 10wt%, the particle size is below 50nm, the overall insulating coating agent accounts for 3% of the amorphous powder, and the pressing pressure is 1800MPa. The subsequent metal powder cores are annealed in vacuum at 450°C. The loss is tested with a BH AC impedance analyzer, and the bending strength is tested with a three-point bending method of a universal tensile testing machine.

[0016] Table 1 Improvement of metal powder core strength and loss by different oxide mixing ratios

[0017]

[0018] It can be seen from the above table that the strength of the metal powder core increases significantly when the nano-oxide is mixed in, and the greater the ratio,...

Embodiment 2

[0020] The powder of this embodiment is the composition that adopts atomization method preparation to be Fe 80 Si 16 B 4 The iron-based amorphous soft magnetic powder, the insulating coating agent selects cyanate and chromium oxide, and the mixing ratio of chromium oxide is 0wt%, 0.01wt%, 1wt%, 2wt%, 5wt%, 10wt% of cyanate, The particle size is below 50nm, the overall insulating coating agent accounts for 3% of the amorphous powder, and the pressing pressure is 1800MPa. The subsequent metal powder cores are annealed in vacuum at 450°C. The loss is tested with a BH AC impedance analyzer, and the bending strength is tested with a three-point bending method of a universal tensile testing machine.

[0021] Table 2 Improvement of metal powder core strength and loss by different oxide mixing ratios

[0022]

[0023] It can be seen from the above table that the strength of the metal powder core increases significantly when the nano-oxide is mixed in, and the greater the ratio,...

Embodiment 3

[0025] The powder of this embodiment is the composition that adopts atomization method preparation to be Fe 80 Si 16 B 4 The iron-based amorphous soft magnetic powder, the insulating coating agent is polyimide and alumina, and the mixing ratio of alumina is 0wt%, 0.01wt%, 1wt%, 2wt%, 5wt%, 10wt% of polyimide %, the particle size is below 50nm, the overall insulating coating agent accounts for 3% of the amorphous powder, and the pressing pressure is 1800MPa. The subsequent metal powder cores are annealed in vacuum at 450°C. The loss is tested with a BH AC impedance analyzer, and the bending strength is tested with a three-point bending method of a universal tensile testing machine.

[0026] Table 3 Improvement of metal powder core strength and loss by different oxide mixing ratios

[0027]

[0028] It can be seen from the above table that the strength of the metal powder core increases significantly when the nano-oxide is mixed in, and the greater the ratio, the higher t...

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Abstract

The invention provides an insulating coating method and a metal powder core prepared with the same. The insulating coating method is characterized by mixing high-temperature organic insulating coating agent with nano oxide at the proportion of 0.01-8 percent by weight. The insulating coating method can improve the heat treatment temperature of the metal powder core by over 50 DEG C, reduce the loss by over 50mW / cm3 and ensure that the three-point bending strength is over 5Mpa.

Description

technical field [0001] The invention belongs to the field of metal functional materials, and relates to an insulating coating method and a metal powder core prepared according to the method. Background technique [0002] At present, the insulating coating agent in the field of metal powder cores generally adopts inorganic insulating coating agent, which is characterized by low price, high temperature heat treatment resistance and high strength after heat treatment. Inorganic insulating coating agents generally use sodium silicate, phosphate and mineral powders, such as bentonite, kaolin, etc. These substances are all oxides, with a wide range of materials, high decomposition temperature, and high strength after heat treatment (greater than 600 ° C). With the development of metal powder cores, the market demand for sendust, iron silicon, and amorphous metal powder cores is gradually increasing. These materials have the characteristics of high hardness and poor plasticity, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02H01F41/02
Inventor 张燕飞张海波郭峰贾春红
Owner KUNSHAN CITONG NEW MATERIAL TECH CO LTD
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