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Metal composite magnetic powder and metal magnetic powder core

A metal composite and magnetic powder core technology, applied in the field of metal composite magnetic powder and metal magnetic powder core, can solve problems such as complicated steps, and achieve the effects of short response time, high magnetic permeability and low high frequency loss

Inactive Publication Date: 2018-09-28
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN201210443610.X discloses a preparation process of a high magnetic flux density and low core loss sendust magnetic powder core. The target is obtained through steps such as powder selection, pretreatment, passivation treatment, insulation coating treatment, compression molding, and heat treatment. The prepared product has high magnetic permeability and low core loss, but the steps are relatively complicated

Method used

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  • Metal composite magnetic powder and metal magnetic powder core
  • Metal composite magnetic powder and metal magnetic powder core

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preparation example Construction

[0027] The preparation of the metal composite magnetic powder of the present invention includes: reacting the flattened metal magnetic powder with nitrogen plasma to obtain the metal composite magnetic powder with a nitride insulating coating layer formed on the surface.

[0028] During the reaction, N 2 Ionized into nitrogen ions, nitrogen ions have good activity, can quickly react with metal magnetic powder, and in situ synthesize insulating nitride on the surface of metal magnetic powder, fully ensuring the uniformity and integrity of the insulating layer. These nitrides have high strength, stability, and wear resistance, which can ensure that the metal magnetic powder core blocks the electrical contact between the metal magnetic powder during the pressing molding process and use, effectively reduces high-frequency eddy current loss, and broadens the application field of the magnetic powder core.

[0029] At present, there are two types of metal magnetic powder coating meth...

Embodiment 1

[0047] 1. Preparation of sendust magnetic powder core

[0048] (1) Put the sendust magnetic powder into a frequency conversion planetary ball mill for ball milling, use quenched steel balls, the ball-to-material ratio is 12:1, the ball mill speed is 35r / min, and the ball milling time is 40h to obtain flat sendust magnetic powder .

[0049] (2) Put the ball-milled sendust magnetic powder into the reaction chamber of the plasma-enhanced chemical vapor deposition equipment, evacuate to 3pa, and then pass N 2 , N 2 Keep the pressure at 30pa, start the radio frequency power supply, the radio frequency power is 200w, start the heating device of the reaction chamber, control the temperature at 300°C, and set the reaction time at 0min, 10min, 30min, 60min and 90min, and obtain 5 types of nitride insulating packages formed on the surface Coated sendust composite magnetic powder, these five kinds of sendust composite magnetic powder are numbered a 1 , b 1 、c 1 、d 1 and e 1 .

[...

Embodiment 2

[0061] 1. Preparation of sendust magnetic powder core

[0062] (1) Put the sendust magnetic powder into a frequency conversion planetary ball mill for ball milling, use quenched steel balls, the ball-to-material ratio is 12:1, the ball mill speed is 35r / min, and the ball milling time is 40h to obtain flat sendust magnetic powder .

[0063] (2) Put the ball-milled sendust magnetic powder into the reaction chamber of the plasma-enhanced chemical vapor deposition equipment, vacuumize to 3pa, and then pass into O 2 , O 2 Keep the pressure at 26pa, start the radio frequency power supply, the radio frequency power is 100w, do not start the heating device of the reaction chamber, set the reaction time to 0min, 10min, 30min, 60min and 90min, and obtain 5 kinds of iron silicon with nitride insulating coating on the surface Aluminum composite magnetic powder, these five kinds of iron-silicon-aluminum composite magnetic powder are numbered a 2 , b 2 、c 2 、d 2 and e 2 . Use VSM (v...

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Abstract

The application belongs to the field of the metal soft magnetic material, and especially relates to metal composite magnetic powder and the metal magnetic powder core. The preparation of the metal composite magnetic powder provided by the invention comprises the step of enabling the flattened metal magnetic powder to react with nitrogen plasma to obtain metal composite magnetic powder formed witha nitride insulation cladding layer on the surface. A layer of continuous and stable nitride insulating layer is formed on the surface of the metal magnetic powder by using the chemical vapor deposition equipment and taking the nitrogen plasma as the reaction medium, the electric contact between the magnetic powder is effectively blocked, thereby reducing the high-frequency loss of the metal magnetic powder. The metal magnetic powder core prepared by using the above metal composite magnetic powder is high in magnetic conductivity and the low in high frequency loss; the metal composite magneticpowder is simple in preparation process, short in reaction time, low in cost, pollution-free, easy to popularize and use and can be extensively applied to the telecommunication, the radar, the water-absorbing and electromagnetic shielding and various fields.

Description

technical field [0001] The invention belongs to the field of metal soft magnetic materials, and in particular relates to a metal composite magnetic powder and a metal magnetic powder core. Background technique [0002] The magnetic powder core is made by mixing and pressing magnetic material powder and insulating medium. Sentinel magnetic powder core has good overall performance and low cost. It has advantages that other magnetic materials cannot match in many application fields. It has been widely used in inductance filters and choke coils in telecommunications, radar, television, power supplies and other products. And switching power supply core. [0003] The early magnetic powder cores had a relatively low operating frequency, and only required high magnetic permeability but not high requirements for low loss. As the operating frequency of magnetic powder core applications is getting higher and higher, how to reduce the loss of magnetic powder cores while ensuring high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/33H01F41/02
CPCH01F1/33H01F41/0246
Inventor 何玉定刘欢杨元政谢致薇陈先朝许佳雄
Owner GUANGDONG UNIV OF TECH
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