Preparation method of sintered iron powder base soft magnetic composite

A soft magnetic composite material and sintered iron technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of low material strength and limit the popularization and application of soft magnetic composite materials, so as to improve the drying rate and reduce work hardening , to reduce the effect of air gap distribution

Active Publication Date: 2017-10-17
UNIV OF SCI & TECH BEIJING
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  • Application Information

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Problems solved by technology

The traditional iron powder-based soft magnetic composite material is coated with organic and inorganic materials to obtain an insulating layer, and then formed by pressing without high temperature sintering. Due to the low strength of the material, the popularization and application of soft magnetic composite materials is limited.

Method used

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  • Preparation method of sintered iron powder base soft magnetic composite
  • Preparation method of sintered iron powder base soft magnetic composite

Examples

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Effect test

Embodiment 1

[0020] Example 1: Preparation process of Fe-3.5%Si-1.5%P soft magnetic composite material

[0021] 150 μm water atomized pure iron powder, 3 μm ultrafine pure silicon powder and 5 μm ultrafine iron-phosphorus alloy powder are used as raw materials, wherein the phosphorus content in the iron-phosphorus alloy is 23%. Water atomized pure iron powder is subjected to surface oxidation treatment in a water vapor atmosphere at 950°C for 3 hours, and the iron powder after steam treatment is dried at 110°C for 1 hour to obtain pretreated iron powder; pretreated iron powder and pure silicon powder and The iron-phosphorus alloy powder is uniformly pre-mixed to obtain a mixed powder. The mixed powder is bonded in a double-cone spray mixer. The binder is styrene-butadiene rubber, and the solvent is methylene chloride. The content of the binder in the binder solution is 0.3wt%, and the dissolution temperature of the binder is 80°C. First, the binder is dissolved in a solvent at a tempera...

Embodiment 2

[0022] Example 2: Preparation process of Fe-6.5%Si-2.0%P soft magnetic composite material

[0023] 180 μm water atomized pure iron powder, 2 μm ultrafine pure silicon powder, and 3 μm ultrafine iron-phosphorus alloy powder are used as raw materials, wherein the phosphorus content in the iron-phosphorus alloy is 21%. Water atomized pure iron powder is subjected to surface oxidation treatment in a water vapor atmosphere at 900°C for 1 hour, and the iron powder after steam treatment is dried at 120°C for 1.5 hours to obtain pretreated iron powder; pretreated iron powder and pure silicon powder and The iron-phosphorus alloy powder is uniformly pre-mixed to obtain a mixed powder. The mixed powder is bonded in a double-cone spray mixer. The binder is polyethylene wax, and the solvent is n-heptane. The content of the binder in the binder solution is 0.4wt%, and the dissolution temperature of the binder is 60°C. First, the binder is dissolved in a solvent at a temperature of 60°C t...

Embodiment 3

[0024] Example 3: Preparation process of Fe-4.0%Si-2.5%P soft magnetic composite material

[0025]100 μm water atomized pure iron powder, 5 μm ultrafine pure silicon powder, and 1 μm ultrafine iron-phosphorus alloy powder are used as raw materials, wherein the phosphorus content in the iron-phosphorus alloy is 22%. Water atomized pure iron powder is subjected to surface oxidation treatment in a water vapor atmosphere at 1050°C for 1 hour, and the iron powder after steam treatment is dried at 100°C for 1 hour to obtain pretreated iron powder; the pretreated iron powder and pure silicon powder and The iron-phosphorus alloy powder is uniformly pre-mixed to obtain a mixed powder. The mixed powder is bonded in a double-cone spray mixer. The binder is a blend of polyethylene wax, ethylene bis stearic acid amide and stearic acid. The solvent is a mixed solvent of chloroform, n-heptane and alcohol. The content of the binder in the binder solution is 0.2wt%, and the dissolution temp...

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Abstract

The invention provides a preparation method of a sintered iron powder base soft magnetic composite, and belongs to the technical field of soft magnetic composites. The technological process includes the steps that initially, pretreatment is conducted on water atomized iron powder by means of high-temperature steam treatment, then cementation treatment is conducted by means of a double tapered spraying blender, a binder solution is atomized and evenly sprayed on materials continuously tumbling under the effect of a high-pressure gas, ultrathin pure silica powder and ultrathin iron-phosphorus alloy powder evenly adhere to the surfaces of iron powder particles, and sintered iron base powder is obtained. High-density compact is prepared by high-speed compacting through a warm mold with the mold wall lubricated, then fast sintering densification at low temperature is conducted, and finally an iron-silicon-phosphorus soft magnetic composite is obtained. The sintered iron powder base soft magnetic composite has the advantages of high magnetic permeability, low eddy-current loss and high strength, and is suitable for high-frequency application.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic composite materials, and relates to a method for preparing sintered soft magnetic composite materials by combining steam treatment of iron powder, double-cone spray-type bonding treatment, high-speed pressing with a warm mold and low-temperature sintering. Background technique [0002] Iron powder-based soft magnetic composite material is a kind of electromagnetic application material prepared by powder metallurgy process by insulating the surface of powder particles. Soft magnetic composite materials have high resistivity and low eddy current loss in alternating magnetic fields, and are suitable for use at higher frequencies. They are used in electrical, electric and electronic equipment, such as electromagnet cores, circuit breaker cores, transformer cores, motors There are important applications in fields such as stator and rotor cores. The traditional iron powder-based soft magnetic com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F1/22B22F1/00
CPCH01F1/14766H01F1/22B22F1/10
Inventor 曲选辉孙海身章林陈彦秦明礼
Owner UNIV OF SCI & TECH BEIJING
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