Method for manufacturing powder used for pressing and manufacturing Fe-Si-Al magnetic core

Abstract

The invention relates to a method for producing iron silicon aluminum magnetic powder, wherein it comprises that: using vacuum sensitive furnace to smelt, adding some manganese, titanium, to prepare the iron silicon aluminum alloy casting block; using mechanical method to break block into powder lower than 120 deals, removing stress and reducing. Since it adds manganese and titanium into alloy, the saturated magnetic density can reach 11000-11500Gs, the correct force is lower than 160A / m; and it uses mechanical breaking method to make the powder into polygons, to be molded in low pressure. The inventive magnetic powder has low magnetic consumption and better direct-current bias magnetic field (DC Bias). And via different diameters and formulas, it can produce the iron silicon aluminum magnetic powder whose effective magnetic conductivity is mue=60, mue=75, mue=90, and mue=125.

Description

technical field

[0001] The invention belongs to the technical field of manufacturing magnetic objects, in particular to a method for manufacturing powder for pressing sendust magnetic powder cores. Background technique

[0002] It is known from metal physics and precision alloy theory that in Fe-Si-Al alloy, when 9.6% Si, 5.6% Al, and the rest are the chemical composition of Fe, the magnetocrystalline anisotropy coefficient K is close to 0. The magnetostriction coefficient is close to 0. At this time, the magnetic saturation induction intensity reaches 1.05T (Tesla), and the magnetic permeability has a large mutation (increase). Using this characteristic, it can be used to make excellent soft magnetic products. Due to the hard and brittle characteristics of this alloy, it cannot be rolled into a strip, nor can it be made into a strip material like a silicon steel sheet, but it can be crushed into powder, and then molded to make inductor cores of variou...

Examples

Embodiment 1

[0015] Put industrial pure iron, polysilicon, pure aluminum, metal manganese, and sponge titanium into a vacuum induction furnace with a nominal weight of 50 kg for smelting. Its chemical composition is 9.02% silicon, 6.48% aluminum, 0.18% manganese, 0.35% titanium, and the rest is Fe , C is 0.012%, O 2 is 90PPm, N 2 For alloy ingots ≤ 50PPm, the alloy ingots are broken into pieces below 30 mm by hammer crushing method, and then enter the jaw crusher to be broken into pieces below 3 mm, and then enter the high-efficiency vibrating ball mill to grind them into pieces less than 120 Purpose alloy powder. The alloy powder is placed in a box-type electric furnace with hydrogen protection and kept at 900±10°C for 4 hours for stress relief treatment. According to the weight percentage of particles less than 120 mesh to 200 mesh is 20, the weight percent of particles less than 200 mesh to 300 mesh is 60, and the rest is less than 300 mesh particles, passivation treatment is carried ...

Embodiment 2

[0020] The manufacturing process is the same as in Example 1, the chemical composition of the alloy is 9.96% Si, 5.60% Al, 0.12% Mn, 0.55% Ti, 0.012% C, O 2 ≤0.010%, N 2 =40PPm, the remainder being Fe. The crushing method is the same as in Example 1. The stress relief treatment temperature is 1000°C for 2 hours, and the particle size ratio is: less than 120 mesh to 200 mesh accounts for 15%, less than 200 mesh to 300 mesh accounts for 60%, and the rest is fine powder less than 300 mesh. Powder passivation treatment, adding insulating agent, lubricant, release agent and mixing uniformly are the same as in Example 1, and its electromagnetic performance parameters are shown in Table 2:

[0021] Table 2 φ27.0 / φ14.7×11.20 φ0.5mm, 26Ts

[0022]

Embodiment 3

[0024] The manufacturing process is the same as in Example 1, the chemical composition of the alloy is 9.50% Si, 6.00% Al, 0.15% Mn, 0.45% Ti, 0.008% C, O 2 80PPm,N 2 40PPm, remaining is Fe, and crushing method is with embodiment 1, and stress relief treatment temperature is 950 ℃ of insulations for 3 hours, particle size proportioning is with embodiment 2, and operations such as powder passivation treatment are with embodiment 1. Its electromagnetic performance parameters are shown in Table 3:

[0025] Table 3 φ27.0 / φ14.7×11.20 φ0.5mm, 26Ts

[0026]

technical field

[0001] The invention belongs to the technical field of manufacturing magnetic objects, in particular to a method for manufacturing powder for pressing sendust magnetic powder cores. Background technique

[0002] It is known from metal physics and precision alloy theory that in Fe-Si-Al alloy, when 9.6% Si, 5.6% Al, and the rest are the chemical composition of Fe, the magnetocrystalline anisotropy coefficient K is close to 0. The magnetostriction coefficient is close to 0. At this time, the magnetic saturation induction intensity reaches 1.05T (Tesla), and the magnetic permeability has a large mutation (increase). Using this characteristic, it can be used to make excellent soft magnetic products. Due to the hard and brittle characteristics of this alloy, it cannot be rolled into a strip, nor can it be made into a strip material like a silicon steel sheet, but it can be crushed into powder, and then molded to make inductor cores of variou...

Examples

Embodiment 1

[0015] Put industrial pure iron, polysilicon, pure aluminum, metal manganese, and sponge titanium into a vacuum induction furnace with a nominal weight of 50 kg for smelting. Its chemical composition is 9.02% silicon, 6.48% aluminum, 0.18% manganese, 0.35% titanium, and the rest is Fe , C is 0.012%, O 2 is 90PPm, N 2 For alloy ingots ≤ 50PPm, the alloy ingots are broken into pieces below 30 mm by hammer crushing method, and then enter the jaw crusher to be broken into pieces below 3 mm, and then enter the high-efficiency vibrating ball mill to grind them into pieces less than 120 Purpose alloy powder. The alloy powder is placed in a box-type electric furnace with hydrogen protection and kept at 900±10°C for 4 hours for stress relief treatment. According to the weight percentage of particles less than 120 mesh to 200 mesh is 20, the weight percent of particles less than 200 mesh to 300 mesh is 60, and the rest is less than 300 mesh particles, passivation treatment is carried ...

Embodiment 2

[0020] The manufacturing process is the same as in Example 1, the chemical composition of the alloy is 9.96% Si, 5.60% Al, 0.12% Mn, 0.55% Ti, 0.012% C, O 2 ≤0.010%, N 2 =40PPm, the remainder being Fe. The crushing method is the same as in Example 1. The stress relief treatment temperature is 1000°C for 2 hours, and the particle size ratio is: less than 120 mesh to 200 mesh accounts for 15%, less than 200 mesh to 300 mesh accounts for 60%, and the rest is fine powder less than 300 mesh. Powder passivation treatment, adding insulating agent, lubricant, release agent and mixing uniformly are the same as in Example 1, and its electromagnetic performance parameters are shown in Table 2:

[0021] Table 2 φ27.0 / φ14.7×11.20 φ0.5mm, 26Ts

[0022]

Embodiment 3

[0024] The manufacturing process is the same as in Example 1, the chemical composition of the alloy is 9.50% Si, 6.00% Al, 0.15% Mn, 0.45% Ti, 0.008% C, O 2 80PPm,N 2 40PPm, remaining is Fe, and crushing method is with embodiment 1, and stress relief treatment temperature is 950 ℃ of insulations for 3 hours, particle size proportioning is with embodiment 2, and operations such as powder passivation treatment are with embodiment 1. Its electromagnetic performance parameters are shown in Table 3:

[0025] Table 3 φ27.0 / φ14.7×11.20 φ0.5mm, 26Ts

[0026]

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