A kind of manufacturing method of sendust metal magnetic powder core

Abstract

The invention discloses a manufacturing method of a sendust metal magnetic powder core, including the following steps: (1) magnetic powder ratio, (2) magnetic powder surface passivation treatment, (3) magnetic powder insulation coating, (4) dry pressing molding , (5) annealing in an inert gas atmosphere, (6) insulating coating on the outer surface. The manufacturing method of the sendust metal magnetic powder core provided by the present invention adopts deionized water to mix phosphoric acid and zinc nitrate solution for passivation treatment, and uses sodium silicate water solution to mix kaolin for powder insulation. The whole process has no discharge and does not pollute the environment. The cost is low, the loss of the manufactured product is low, the DC superposition characteristic is good, and the overall performance is better than the industry standard.

Description

technical field

[0001] The invention relates to the technical field of manufacturing magnetic substances, in particular to a method for manufacturing soft magnetic silicon-aluminum magnetic powder cores. Background technique

[0002] The sendust metal magnetic powder core is a kind of soft magnetic material which is mixed and pressed with sendust powder and insulating medium; because the particle size of the powder is small, and the powder surface is covered by a non-magnetic insulating film, the particles are separated from each other. Therefore, the eddy current of the magnet is isolated, and there is basically no skin effect. On the other hand, the magnet has the characteristic of constant magnetic permeability due to the gap effect. The sendust magnetic powder core can be used at a frequency above 8KHz, the saturation magnetic induction is about 1.05T, and the effective magnetic permeability ranges from 26 to 125; the magnetostriction coefficient is close to zero, and th...

Examples

example 1

[0019] 1. Take sendust aluminum powder, in which the proportion of each component is Si9.1~10.2 by weight, and the balance of Al4.9~6.1 is Fe; the ratio of particle size is as follows: +150 mesh 5%, - 150 mesh to +300 mesh accounted for 85%, and -300 mesh accounted for 10%. In this embodiment, the Si content was 9.9, the Al content was 5.2, and the Al particle size was +100 mesh.

[0020] 2. Passivate the magnetic powder with a good ratio in step 1. The passivating agent used is an aqueous solution of 1% phosphoric acid and zinc nitrate by powder mass.

[0021] 3. After the passivation is completed, use an insulating binder to insulate and coat the powder mass of 1.5% sodium silicate and kaolin aqueous solution and dry it.

[0022] 4. After the insulating coating is completed, add 0.3% mold release lubricant and mix evenly, and dry press molding under a pressure of 1800MPa to obtain a blank.

[0023] 5. Put the blank in a protective atmosphere and keep it warm at 680°C for 1H...

example 2

[0029] 1. Take sendust aluminum powder, in which the proportion of each component is Si9.1~10.2 by weight, and the balance of Al4.9~6.1 is Fe; the ratio of particle size is as follows: +150 mesh 5%, - 150 mesh to +300 mesh accounted for 85%, and -300 mesh accounted for 10%. In this embodiment, the Si content was 9.5, the Al content was 5.5, and the Al particle size was -50 mesh.

[0030] 2. Passivate the magnetic powder with a good ratio in step 1. The passivating agent used is an aqueous solution of 2% phosphoric acid and zinc nitrate by powder mass.

[0031] 3. After the passivation is completed, use an insulating binder to insulate and coat the powder mass of 2.5% sodium silicate and kaolin aqueous solution and dry it.

[0032] 4. After the insulating coating is completed, add 0.3% mold release lubricant and mix evenly, and dry press molding under a pressure of 2100MPa to obtain a blank.

[0033] 5. Place the blank in a protective atmosphere and heat it at 700°C for 1H for...

example 3

[0039] 1. Take sendust aluminum powder, in which the proportion of each component is Si9.1~10.2 by weight, and the balance of Al4.9~6.1 is Fe; the ratio of particle size is as follows: +150 mesh 5%, - 150 mesh to +300 mesh accounted for 85%, and -300 mesh accounted for 10%. In this embodiment, the Si content was 9.7, the Al content was 5.7, and the Al particle size was +150 mesh.

[0040] 2. Passivate the magnetic powder with a good ratio in step 1. The passivating agent used is an aqueous solution of 1.5% phosphoric acid and zinc nitrate by powder mass.

[0041] 3. After the passivation is completed, use an insulating binder to insulate and coat the powder mass of 2% sodium silicate and kaolin aqueous solution and dry it.

[0042] 4. After the insulation coating is completed, add 0.3% mold release lubricant and mix evenly, and dry press molding under a pressure of 2000MPa to obtain a blank.

[0043] 5. Put the blank in a protective atmosphere and keep it warm at 680°C for 1H...

technical field

[0001] The invention relates to the technical field of manufacturing magnetic substances, in particular to a method for manufacturing soft magnetic silicon-aluminum magnetic powder cores. Background technique

[0002] The sendust metal magnetic powder core is a kind of soft magnetic material which is mixed and pressed with sendust powder and insulating medium; because the particle size of the powder is small, and the powder surface is covered by a non-magnetic insulating film, the particles are separated from each other. Therefore, the eddy current of the magnet is isolated, and there is basically no skin effect. On the other hand, the magnet has the characteristic of constant magnetic permeability due to the gap effect. The sendust magnetic powder core can be used at a frequency above 8KHz, the saturation magnetic induction is about 1.05T, and the effective magnetic permeability ranges from 26 to 125; the magnetostriction coefficient is close to zero, and th...

Examples

example 1

[0019] 1. Take sendust aluminum powder, in which the proportion of each component is Si9.1~10.2 by weight, and the balance of Al4.9~6.1 is Fe; the ratio of particle size is as follows: +150 mesh 5%, - 150 mesh to +300 mesh accounted for 85%, and -300 mesh accounted for 10%. In this embodiment, the Si content was 9.9, the Al content was 5.2, and the Al particle size was +100 mesh.

[0020] 2. Passivate the magnetic powder with a good ratio in step 1. The passivating agent used is an aqueous solution of 1% phosphoric acid and zinc nitrate by powder mass.

[0021] 3. After the passivation is completed, use an insulating binder to insulate and coat the powder mass of 1.5% sodium silicate and kaolin aqueous solution and dry it.

[0022] 4. After the insulating coating is completed, add 0.3% mold release lubricant and mix evenly, and dry press molding under a pressure of 1800MPa to obtain a blank.

[0023] 5. Put the blank in a protective atmosphere and keep it warm at 680°C for 1H...

example 2

[0029] 1. Take sendust aluminum powder, in which the proportion of each component is Si9.1~10.2 by weight, and the balance of Al4.9~6.1 is Fe; the ratio of particle size is as follows: +150 mesh 5%, - 150 mesh to +300 mesh accounted for 85%, and -300 mesh accounted for 10%. In this embodiment, the Si content was 9.5, the Al content was 5.5, and the Al particle size was -50 mesh.

[0030] 2. Passivate the magnetic powder with a good ratio in step 1. The passivating agent used is an aqueous solution of 2% phosphoric acid and zinc nitrate by powder mass.

[0031] 3. After the passivation is completed, use an insulating binder to insulate and coat the powder mass of 2.5% sodium silicate and kaolin aqueous solution and dry it.

[0032] 4. After the insulating coating is completed, add 0.3% mold release lubricant and mix evenly, and dry press molding under a pressure of 2100MPa to obtain a blank.

[0033] 5. Place the blank in a protective atmosphere and heat it at 700°C for 1H for...

example 3

[0039] 1. Take sendust aluminum powder, in which the proportion of each component is Si9.1~10.2 by weight, and the balance of Al4.9~6.1 is Fe; the ratio of particle size is as follows: +150 mesh 5%, - 150 mesh to +300 mesh accounted for 85%, and -300 mesh accounted for 10%. In this embodiment, the Si content was 9.7, the Al content was 5.7, and the Al particle size was +150 mesh.

[0040] 2. Passivate the magnetic powder with a good ratio in step 1. The passivating agent used is an aqueous solution of 1.5% phosphoric acid and zinc nitrate by powder mass.

[0041] 3. After the passivation is completed, use an insulating binder to insulate and coat the powder mass of 2% sodium silicate and kaolin aqueous solution and dry it.

[0042] 4. After the insulation coating is completed, add 0.3% mold release lubricant and mix evenly, and dry press molding under a pressure of 2000MPa to obtain a blank.

[0043] 5. Put the blank in a protective atmosphere and keep it warm at 680°C for 1H...

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