Iron-based soft magnetic composite material with mesoporous structure coating layer and preparation method of iron-based soft magnetic composite material

Abstract

The invention discloses an iron-based soft magnetic composite material with a mesoporous structure coating layer and a preparation method of the iron-based soft magnetic composite material, which belong to the technical field of metal powder metallurgy and magnetic material preparation. According to the method, a hard thin-wall mesoporous structure TiO2 insulating coating layer is formed on the surface of iron-based alloy powder by adopting a confinement interface micelle assembly method and combining with a warm-pressing process in which polyethylene glycol is used as a bonding lubricant. The formation of the mesoporous structure comes from the self-assembly of micelles and depends on the confinement effect and solvent selection of glycerol in the assembly process, so that the effective regulation and control of the thickness of the coating layer and the mesoporous size are realized by adjusting the addition amount of glycerol, the thickness of the TiO2 hydrogel coating layer is adjustable in the range of 11-50 nm, and the mesoporous size is adjustable in the range of 4.5-20 nm. The magnetic conductivity loss can be reduced, and the product density and strength can be improved. Meanwhile, through the generation of the mesoporous structure coating, the saturation flux density of the SMC soft magnetic composite material can be remarkably improved, the magnetic loss is reduced, and the preparation method has important significance.

Description

technical field

[0001] The invention belongs to the technical field of metal powder metallurgy and magnetic material preparation, and in particular relates to an iron-based soft magnetic composite material and a preparation method thereof. Background technique

[0002] Currently, mesoporous core-shell nanostructures have received a lot of attention in many research fields. Due to the combination of core and shell functions, this structure can improve the stability and dispersion of core particles, and even the original photonic and electronic properties. Most shells that form around the core usually consist of a dense solid part, and turning the dense shell into a mesoporous shell can significantly improve the material's performance, because such mesopores on the shell can accommodate molecules and allow diffusion in and out of the core, unlike Their textural properties, high porosity and high surface area are related. For example, mesoporous TiO 2 The shell can greatly i...

Examples

Embodiment 1

[0032] Step 1. Put ultra-fine spherical pure iron powder with a particle size of 1 μm into acetone solvent, add silane coupling agent to activate the surface of the powder, and put it in a blast drying oven at 50°C for later use;

[0033] Step 2, TiO 2 Hydrogel preparation: measure 3.0g of F127, 5.0g of acetic acid, 7.0g of concentrated hydrochloric acid with a mass fraction of 36wt%, put them into a beaker filled with 60mL of tetrahydrofuran solvent, stir vigorously for 15min, and add 7.0g of tetrabutyl titanate dropwise Add 0.3mL of deionized water to form a yellow-white solution after magnetic stirring for 10min. Move the above solution into a blast drying oven and dry it at 50°C for 24h to form TiO 2 / surfactant complex light yellow hydrogel;

[0034]Step 3. Weigh 2 g of the above-mentioned light yellow gel, put it into a beaker filled with 30 mL of absolute ethanol, stir vigorously for 10 min to form a transparent solution, add 30 mL of glycerin drop by drop and stir con...

Embodiment 2

[0038] Step 1. Put ultra-fine spherical pure iron powder and spherical sendust aluminum powder with a particle size of 10 μm into acetone solvent, add silane coupling agent to activate the surface of the powder, and put it in a blast drying oven for drying at 60°C for later use;

[0039] Step 2, TiO 2 Hydrogel preparation: measure 3.0g of F127, 5.0g of acetic acid, 7.0g of concentrated hydrochloric acid with a mass fraction of 36wt%, put them into a beaker filled with 60mL of tetrahydrofuran solvent, stir vigorously for 15min, and add 9.0g of tetrabutyl titanate dropwise Add 0.5mL of deionized water to form a yellow-white solution after magnetic stirring for 12min. Move the above solution into a blast drying oven and dry it at 55°C for 22h to form TiO 2 / surfactant complex light yellow hydrogel;

[0040] Step 3: Weigh 4 g of the above-mentioned light yellow gel, put it into a beaker filled with 120 mL of absolute ethanol, stir vigorously for 10 min to form a transparent solut...

Embodiment 3

[0044] Step 1. Put the ultra-fine spherical iron-silicon-chromium alloy powder with a particle size of 20 μm into an acetone solvent, add a silane coupling agent to activate the surface of the powder, and put it in a blast drying oven for drying at 70°C for later use;

[0045] Step 2, TiO 2 Hydrogel preparation: measure 3.0g of F127, 5.0g of acetic acid, 7.0g of concentrated hydrochloric acid with a mass fraction of 36wt%, put them into a beaker filled with 60mL of tetrahydrofuran solvent, stir vigorously for 15min, and add 7.0g of tetrabutyl titanate dropwise Add 0.3mL of deionized water to the ester, and after magnetic stirring for 10min, a yellow-white solution is formed. Move the above solution into a blast drying oven, and dry it at 60°C for 20h to form TiO 2 / surfactant complex light yellow hydrogel;

[0046] Step 3. Weigh 2 g of the above-mentioned light yellow gel, put it into a beaker filled with 30 mL of absolute ethanol, stir vigorously for 10 min to form a transpa...

technical field

[0001] The invention belongs to the technical field of metal powder metallurgy and magnetic material preparation, and in particular relates to an iron-based soft magnetic composite material and a preparation method thereof. Background technique

[0002] Currently, mesoporous core-shell nanostructures have received a lot of attention in many research fields. Due to the combination of core and shell functions, this structure can improve the stability and dispersion of core particles, and even the original photonic and electronic properties. Most shells that form around the core usually consist of a dense solid part, and turning the dense shell into a mesoporous shell can significantly improve the material's performance, because such mesopores on the shell can accommodate molecules and allow diffusion in and out of the core, unlike Their textural properties, high porosity and high surface area are related. For example, mesoporous TiO 2 The shell can greatly i...

Examples

Embodiment 1

[0032] Step 1. Put ultra-fine spherical pure iron powder with a particle size of 1 μm into acetone solvent, add silane coupling agent to activate the surface of the powder, and put it in a blast drying oven at 50°C for later use;

[0033] Step 2, TiO 2 Hydrogel preparation: measure 3.0g of F127, 5.0g of acetic acid, 7.0g of concentrated hydrochloric acid with a mass fraction of 36wt%, put them into a beaker filled with 60mL of tetrahydrofuran solvent, stir vigorously for 15min, and add 7.0g of tetrabutyl titanate dropwise Add 0.3mL of deionized water to form a yellow-white solution after magnetic stirring for 10min. Move the above solution into a blast drying oven and dry it at 50°C for 24h to form TiO 2 / surfactant complex light yellow hydrogel;

[0034]Step 3. Weigh 2 g of the above-mentioned light yellow gel, put it into a beaker filled with 30 mL of absolute ethanol, stir vigorously for 10 min to form a transparent solution, add 30 mL of glycerin drop by drop and stir con...

Embodiment 2

[0038] Step 1. Put ultra-fine spherical pure iron powder and spherical sendust aluminum powder with a particle size of 10 μm into acetone solvent, add silane coupling agent to activate the surface of the powder, and put it in a blast drying oven for drying at 60°C for later use;

[0039] Step 2, TiO 2 Hydrogel preparation: measure 3.0g of F127, 5.0g of acetic acid, 7.0g of concentrated hydrochloric acid with a mass fraction of 36wt%, put them into a beaker filled with 60mL of tetrahydrofuran solvent, stir vigorously for 15min, and add 9.0g of tetrabutyl titanate dropwise Add 0.5mL of deionized water to form a yellow-white solution after magnetic stirring for 12min. Move the above solution into a blast drying oven and dry it at 55°C for 22h to form TiO 2 / surfactant complex light yellow hydrogel;

[0040] Step 3: Weigh 4 g of the above-mentioned light yellow gel, put it into a beaker filled with 120 mL of absolute ethanol, stir vigorously for 10 min to form a transparent solut...

Embodiment 3

[0044] Step 1. Put the ultra-fine spherical iron-silicon-chromium alloy powder with a particle size of 20 μm into an acetone solvent, add a silane coupling agent to activate the surface of the powder, and put it in a blast drying oven for drying at 70°C for later use;

[0045] Step 2, TiO 2 Hydrogel preparation: measure 3.0g of F127, 5.0g of acetic acid, 7.0g of concentrated hydrochloric acid with a mass fraction of 36wt%, put them into a beaker filled with 60mL of tetrahydrofuran solvent, stir vigorously for 15min, and add 7.0g of tetrabutyl titanate dropwise Add 0.3mL of deionized water to the ester, and after magnetic stirring for 10min, a yellow-white solution is formed. Move the above solution into a blast drying oven, and dry it at 60°C for 20h to form TiO 2 / surfactant complex light yellow hydrogel;

[0046] Step 3. Weigh 2 g of the above-mentioned light yellow gel, put it into a beaker filled with 30 mL of absolute ethanol, stir vigorously for 10 min to form a transpa...

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