阅读说明：本技术 一种高防腐的铁硅铬合金软磁材料其制备方法 (High-corrosion-resistance iron-silicon-chromium alloy soft magnetic material and preparation method thereof ) 是由 杨明雄 向晋钰 于 2020-07-08 设计创作，主要内容包括：本发明提供了一种高防腐的铁硅铬合金软磁材料,其特征在于,按重量份数,包括：镀氮化铝膜的铁硅铬合金粉100-120份；粘合剂溶液0.5-8份；所述镀氮化铝膜的铁硅铬合金粉由以下方法制备得到：以金属铝为靶材,以氩气为溅射气体,以氮气为反应气体,通过调整溅射功率和氮气流量,在铁硅铬合金粉末表面沉积形成氮化铝薄膜。这种铁硅铬合金软磁材料,通过在铁硅铬合金粉的表面镀氮化铝膜,并与粘合剂溶液混合,制备得到的磁芯材料不腐蚀生锈,绝缘性能好。本发明还提供了上述高防腐的铁硅铬合金软磁材料的制备方法。(The invention provides a high-corrosion-resistance iron-silicon-chromium alloy soft magnetic material which is characterized by comprising the following components in parts by weight: 100-120 parts of iron-silicon-chromium alloy powder plated with an aluminum nitride film; 0.5-8 parts of adhesive solution; the iron-silicon-chromium alloy powder of the aluminum nitride plated film is prepared by the following method: and (3) taking metal aluminum as a target material, argon as sputtering gas and nitrogen as reaction gas, and depositing on the surface of the iron-silicon-chromium alloy powder to form an aluminum nitride film by adjusting sputtering power and nitrogen flow. The iron-silicon-chromium alloy soft magnetic material is prepared by plating an aluminum nitride film on the surface of iron-silicon-chromium alloy powder and mixing the aluminum nitride film with a binder solution, so that the prepared magnetic core material is not corroded and rusted and has good insulating property. The invention also provides a preparation method of the high-corrosion-resistance iron-silicon-chromium alloy soft magnetic material.)

1. The high-corrosion-resistance iron-silicon-chromium alloy soft magnetic material is characterized by comprising the following components in parts by weight:

100-120 parts of iron-silicon-chromium alloy powder plated with an aluminum nitride film;

0.5-8 parts of adhesive solution;

the iron-silicon-chromium alloy powder of the aluminum nitride plated film is prepared by the following method:

and (3) taking metal aluminum as a target material, argon as sputtering gas and nitrogen as reaction gas, and depositing on the surface of the iron-silicon-chromium alloy powder to form an aluminum nitride film by adjusting sputtering power and nitrogen flow.

2. The Fe-Si-Cr alloy soft magnetic material as claimed in claim 1, wherein the thickness of the aluminum nitride film in the Fe-Si-Cr alloy powder is 200-900 nm.

3. The Fe-Si-Cr alloy soft magnetic material as claimed in claim 2, wherein the thickness of the aluminum nitride film in the Fe-Si-Cr alloy powder is 400-600 nm.

4. The Fe-Si-Cr alloy soft magnetic material according to claim 1, wherein the binder solution is prepared by dissolving one or more of epoxy resin, PVB, phenolic resin and furfuryl alcohol resin in acetone.

5. The Fe-Si-Cr alloy soft magnetic material according to claim 4, wherein the epoxy resin, PVB, phenolic resin and furfuryl alcohol resin are added in an amount of 0.5-3% by weight of the Fe-Si-Cr alloy powder of the aluminum nitride plated film in the binder solution.

6. The Fe-Si-Cr alloy soft magnetic material according to claim 4, wherein the epoxy resin, PVB, phenolic resin and furfuryl alcohol resin are added in an amount of 0.8-2.4% by weight of the Fe-Si-Cr alloy powder of the aluminum nitride plated film in the binder solution.

7. A method for the production of a Fe-Si-Cr alloy soft magnetic material according to any one of claims 1 to 6, comprising the steps of:

(1) preparing iron-silicon-chromium alloy powder of the aluminum nitride film: depositing a layer of aluminum nitride film on the surface of the iron-silicon-chromium alloy powder by taking metal aluminum as a target material, argon as sputtering gas and nitrogen as reaction gas through regulating sputtering power and nitrogen flow rate to obtain the iron-silicon-chromium alloy powder plated with the aluminum nitride film;

(2) preparation of the binder solution: dissolving one or more of epoxy resin, PVB, phenolic resin and furfuryl alcohol resin in acetone according to the weight percentage to obtain an adhesive solution;

(3) and (3) granulation: mixing, stirring and granulating iron-silicon-chromium alloy powder plated with an aluminum nitride film and an adhesive solution according to the parts by weight to obtain granulated powder;

(4) stamping forming: pressing the granulated powder into a green body by a punch forming machine, and processing the green body into a required shape;

(5) and (3) sintering: sintering in a tunnel furnace, controlling the temperature of a high-temperature section to be 700-950 ℃, keeping the temperature for 2-4 hours, and cooling along with the furnace;

(6) silver coating: silver is coated by adopting a transfer printing mode, and then silver is burnt at the temperature of 600-700 ℃;

(7) water plating: and plating Ni and Sn in water to finish the manufacture of the magnetic core.

8. The method for preparing the Fe-Si-Cr alloy soft magnetic material according to claim 7, wherein in the punch forming, the pressing density is 6.1-6.8 g/cm³。

9. The method for preparing an iron-silicon-chromium alloy soft magnetic material according to claim 7, wherein the purity of the argon gas is more than 99.999 percent, and the purity of the nitrogen gas is more than 99.999 percent.

Technical Field

The invention relates to the technical field of magnetic materials, in particular to a high-corrosion-resistance iron-silicon-chromium alloy soft magnetic material and a preparation method thereof.

Background

At present, an iron-silicon-chromium alloy magnetic core used by a winding inductor is easy to rust due to the poor corrosion resistance of the material and the corrosion of electroplating liquid; moreover, because the insulation resistance of the material is low, the material is easy to creep up during electroplating, so that the metallization cannot be carried out in a silver-water plating mode, and the metallization can only be carried out in a PVD vacuum plating mode which is expensive and has large product specification limitation.

In the conventional materials for coating the iron-silicon-chromium alloy magnetic core, the magnetic material is often coated by solution reaction. For example, chinese patent publication No. CN104028750A discloses a high bonding strength insulation coating treatment method for a metal soft magnetic composite material; the method comprises the following steps: 1) sieving the metal magnetic powder to carry out granularity proportioning; 2) insulating and coating the prepared metal magnetic powder by using a sol-gel method and then drying; 3) uniformly mixing the dried magnetic powder with a binder, adding a release agent, performing dry pressing, and pressing into a magnetic ring; 4) and (3) keeping the temperature of the magnetic ring in a protective atmosphere, air cooling and spraying to obtain a target product. The sol-gel method is adopted to coat the metal soft magnetic composite material with the insulating layer with high bonding strength, and the treatment mode is complex.

Therefore, how to better treat the iron-silicon-chromium alloy powder to avoid rusting and poor insulating property is a technical problem to be solved by the technical personnel in the field.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a high-corrosion-resistance iron-silicon-chromium alloy soft magnetic material. The invention also provides a preparation method of the high-corrosion-resistance iron-silicon-chromium alloy soft magnetic material.

In order to achieve the purpose, the invention provides the following technical scheme:

a high corrosion-resistant iron-silicon-chromium alloy soft magnetic material comprises the following components in parts by weight:

100-120 parts of iron-silicon-chromium alloy powder plated with an aluminum nitride film;

0.5-8 parts of adhesive solution;

the iron-silicon-chromium alloy powder of the aluminum nitride plated film is prepared by the following method:

and (3) taking metal aluminum as a target material, argon as sputtering gas and nitrogen as reaction gas, and depositing on the surface of the iron-silicon-chromium alloy powder to form an aluminum nitride film by adjusting sputtering power and nitrogen flow.

The invention plates a layer of nanometer aluminum nitride film on the surface of iron-silicon-chromium alloy powder by a magnetron sputtering mode, the aluminum nitride is a III-V family wide band gap semiconductor (Eg 6.2eV) with a wurtzite structure, has a plurality of excellent characteristics, and the nanometer aluminum nitride film plated on the surface of the iron-silicon-chromium alloy powder has little influence on the magnetic permeability of the material and does not reduce the characteristics of a magnetic core.

As further description of the technical scheme of the invention, in the iron-silicon-chromium alloy powder, the thickness of the aluminum nitride film is 200-900 nm.

As further description of the technical scheme of the invention, in the iron-silicon-chromium alloy powder, the thickness of the aluminum nitride film is 400-600 nm.

As a further description of the technical solution of the present invention, the adhesive solution is prepared by dissolving one or more of epoxy resin, PVB, phenolic resin, and furfuryl alcohol resin in acetone.

As a further description of the technical solution of the present invention, in the adhesive solution, the amount of the epoxy resin, PVB, phenolic resin, and furfuryl alcohol resin added is 0.5-3% of the weight of the iron-silicon-chromium alloy powder of the aluminum nitride plated film.

As a further description of the technical solution of the present invention, in the adhesive solution, the amount of the epoxy resin, PVB, phenolic resin, and furfuryl alcohol resin added is 0.8-2.4% of the weight of the iron-silicon-chromium alloy powder of the aluminum nitride plated film.

The invention also provides a preparation method of the iron-silicon-chromium alloy soft magnetic material, which comprises the following steps:

(1) preparing iron-silicon-chromium alloy powder of the aluminum nitride film: depositing a layer of aluminum nitride film on the surface of the iron-silicon-chromium alloy powder by taking metal aluminum as a target material, argon as sputtering gas and nitrogen as reaction gas through regulating sputtering power and nitrogen flow rate to obtain the iron-silicon-chromium alloy powder plated with the aluminum nitride film;

(2) preparation of the binder solution: dissolving one or more of epoxy resin, PVB, phenolic resin and furfuryl alcohol resin in acetone according to the weight percentage to obtain an adhesive solution;

(3) and (3) granulation: mixing, stirring and granulating iron-silicon-chromium alloy powder plated with an aluminum nitride film and an adhesive solution according to the parts by weight to obtain granulated powder;

(4) stamping forming: pressing the granulated powder into a green body by a punch forming machine, and processing the green body into a required shape;

(5) and (3) sintering: sintering in a tunnel furnace, controlling the temperature of a high-temperature section to be 700-950 ℃, keeping the temperature for 2-4 hours, and cooling along with the furnace;

(6) silver coating: silver is coated by adopting a transfer printing mode, and then silver is burnt at the temperature of 600-700 ℃;

(7) water plating: and plating Ni and Sn in water to finish the manufacture of the magnetic core.

As a further description of the preparation method, the pressing density in the punch forming is 6.1-6.8 g/cm 3.

As a further description of the above preparation method, the purity of the argon is greater than 99.999% and the purity of the nitrogen is greater than 99.999%.

Magnetic permeability of the iron-silicon-chromium alloy powder before treatment is 67; the silicon-chromium alloy soft magnetic material prepared by the preparation method has the advantages of magnetic permeability of 62-65, insulation resistance of 1-3G omega, pressure resistance of 150-250V, no creeping plating on water rust, no corrosion and rust.

Based on the technical scheme, the invention has the following technical effects:

(1) according to the iron-silicon-chromium alloy soft magnetic material provided by the invention, the surface of the iron-silicon-chromium alloy powder is plated with the aluminum nitride film to form the iron-silicon-chromium alloy powder plated with the aluminum nitride film, and the iron-silicon-chromium alloy powder is mixed with the adhesive solution, so that the prepared magnetic core material is free from corrosion and rust and good in insulating property.

(2) The silicon-chromium alloy soft magnetic material prepared by the preparation method provided by the invention has excellent magnetic permeability and insulation resistance, and is not subjected to rust climbing and corrosion and rusting.

Drawings

Fig. 1 is a comparison graph of the forms of the ferrosilicon-chromium alloy powder treated by the preparation method of the present invention and the ferrosilicon-chromium alloy powder which is not treated.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the following detailed description of the embodiments taken in conjunction with the accompanying drawings. The invention provides a preferred embodiment. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.