Preparation method of high-frequency high-magnetic-permeability low-loss iron nickel molybdenum metal magnetic powder core

A high magnetic permeability, iron nickel molybdenum technology, applied in the direction of inductor/transformer/magnet manufacturing, magnetic core/yoke, inorganic material magnetism, etc., can solve the problem of large eddy current loss and difficulty in manufacturing high frequency and high magnetic permeability Low-loss iron-nickel-molybdenum magnetic powder cores, uneven coating, etc., achieve the effects of low cost, easy repetition and control, and simple and easy production process

Active Publication Date: 2012-05-02
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the method of the above-mentioned patents, the amount of non-magnetic substances coated with magnetic powder insulation is relatively large, and the high density and high magnetic permeability of the iron-nickel-molybdenum magnetic powder core cannot be realized; on the other hand, each of these methods has the pyrolysis of the insulating agent, an...

Method used

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  • Preparation method of high-frequency high-magnetic-permeability low-loss iron nickel molybdenum metal magnetic powder core
  • Preparation method of high-frequency high-magnetic-permeability low-loss iron nickel molybdenum metal magnetic powder core
  • Preparation method of high-frequency high-magnetic-permeability low-loss iron nickel molybdenum metal magnetic powder core

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Effect test

Embodiment 1

[0025] In this embodiment, water-atomized iron-nickel-molybdenum magnetic powder is used, and its component weight ratio is: Fe 17wt%, Ni 79wt%, Mo 2wt%, Cu 1wt%, Al, Si+ 100 mesh - -200 mesh 200g, + 200 mesh 750g. Prepare 1 L of chromic acid aqueous solution with a pH of 6 and a concentration of 1%. The chromic acid aqueous solution was transferred to a heating stirrer, heated to 90°C, and kept at a constant temperature. The iron-nickel-molybdenum magnetic powder is placed in a constant temperature chromic acid aqueous solution at 90°C for surface film-forming reaction. The reaction time is 24 hours, and the mixed solution is stirred every 20 minutes. An insulating film with a thickness of several hundred nanometers will be formed on the surface of the magnetic powder. This layer of insulating film is relatively soft before it is dried, and the adhesion to the magnetic powder is not strong, so it needs to be dried and cured. Take out the magnetic powder, place it in an ove...

Embodiment 2

[0027] In this embodiment, water-atomized iron-nickel-molybdenum magnetic powder is used, and its component weight ratio is: Fe 18wt%, Ni 77wt%, Mo 4wt%, Al, Si - 200 mesh 290g, + 200 mesh 700g. Prepare 1 L of chromic acid aqueous solution with a pH of 4 and a concentration of 5%. The chromic acid aqueous solution was transferred to a heating stirrer, heated to 80°C, and kept at a constant temperature. The iron-nickel-molybdenum magnetic powder is placed in a constant temperature chromic acid aqueous solution at 80°C for surface film-forming reaction. The reaction time is 6 hours, and the mixed solution is stirred every 20 minutes. An insulating film with a thickness of several hundred nanometers will be formed on the surface of the magnetic powder. This layer of insulating film is relatively soft before it is dried, and the adhesion to the magnetic powder is not strong, so it needs to be dried and cured. Take out the magnetic powder, place it in an oven, and dry it at 80°C...

Embodiment 3

[0030] In this embodiment, gas-atomized iron-nickel-molybdenum magnetic powder is used, and its composition weight ratio is: Fe 17wt%, Ni 78wt%, Mo 3wt%, Cu 1wt%, Al, Si - 200 mesh 50g, + 200 mesh 850g. Prepare 1 L of chromic acid aqueous solution with a pH of 3 and a concentration of 8%. The chromic acid aqueous solution was transferred to a heating stirrer, heated to 60°C, and kept at a constant temperature. The iron-nickel-molybdenum magnetic powder is placed in a constant temperature chromic acid aqueous solution at 60°C for surface film formation reaction. The reaction time is 15 hours, and the mixed solution is stirred every 20 minutes. An insulating film with a thickness of several hundred nanometers will be formed on the surface of the magnetic powder. This layer of insulating film is relatively soft before it is dried, and the adhesion to the magnetic powder is not strong, so it needs to be dried and cured. Take out the magnetic powder, place it in an oven, and dry...

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Abstract

The invention discloses a preparation method of a high-frequency high-magnetic-permeability low-loss iron nickel molybdenum metal magnetic powder core. According to the traditional method, during magnetic powder insulated costing, the quantity of on-magnetic substances is more, and the high density and high magnetic permeability of the iron nickel molybdenum magnetic powder core can not be realized. The preparation method provided by the invention comprises the following steps: firstly screening selected iron nickel molybdenum magnetic powder subjected to water atomization or iron nickel molybdenum magnetic powder subjected to gas atomization; secondly reacting the iron nickel molybdenum magnetic powder in a chromic acid aqueous solution, thus generating an insulation film on the surface of the magnetic powder; drying for two hours, and solidifying and stabilizing the insulation film on the surface of the magnetic powder; then adding zinc stearate serving as a lubricating agent into the iron nickel molybdenum magnetic powder, mixing and pressing the magnetic powder to obtain the iron nickel molybdenum magnetic powder core and carrying out annealing heat treatment under N2 atmosphere; and finally spraying epoxy paint on the iron nickel molybdenum magnetic powder core. The preparation method provided by the invention can be used for uniformly and firmly generating hundreds of nanometers of the insulation film on the surface of the iron nickel molybdenum magnetic powder, the insulated coating effect is good, the consumption of the non-magnetic insulants is reduced, and the purpose of improving the density and magnetic permeability of the magnetic core is achieved.

Description

technical field [0001] The invention belongs to the field of metal magnetic materials, and relates to a method for preparing a high-frequency, high-permeability and low-loss iron-nickel-molybdenum metal magnetic powder core. This core is the best material for switching power supply direct current (DC) output filter inductors, most suitable for precision audio tuning circuits, high-Q filters, load coils, radio frequency filters and many other precision instrument applications Such as military products, medical equipment, etc. Background technique [0002] With the development of electronic devices such as various switching power converters, filters, and AC-DC converters towards high frequency, miniaturization, and light weight, the iron-nickel-molybdenum metal powder cores used are required to have high magnetic permeability, low loss and High frequency stability. At present, the comprehensive performance of the domestic iron-nickel-molybdenum metal magnetic powder core is ...

Claims

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Application Information

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IPC IPC(8): H01F1/14H01F3/08H01F41/02
Inventor 严密张章明何时金包大新
Owner ZHEJIANG UNIV
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