High magnetic permeability soft magnetic powder for inductors and production method thereof

Abstract

The invention discloses a production method of high magnetic permeability soft magnetic powder for inductors. The method comprises the following steps of: (1) uniformly mixing soft magnetic metal powder with blueing water in a heating state and obtaining blueing film-coated passivation powder after the water is evaporated to dryness, wherein the soft magnetic metal powder is carbonyl iron powder and / or iron silicon chromium alloy and the blueing liquid is obtained by mixing sodium hydroxide solution, sodium nitrite solution and sodium nitrate solution; (2) weighing a glue material according tothe ratio and dissolving the glue material in acetone to obtain an adhesive; (3) mixing the passivation powder with the adhesive, pumping air while stirring until the liquid is completely evaporatedand carrying out extrusion granulation; and (4) baking and drying the obtained granules in an oven and screening. The invention also discloses the high magnetic permeability soft magnetic powder for the inductors, which is prepared by adopting the method. The method disclosed by the invention has the advantages that under the circumstance of guaranteeing that the powder material has good rust resistance and insulativity, the magnetic permeability is avoided being lost by a large margin and the quality of the powder material is improved.

Description

technical field

[0001] The invention belongs to the technical field of magnetic functional materials, and in particular relates to a method for producing soft magnetic powder for inductance with high magnetic permeability and the soft magnetic powder. Background technique

[0002] Magnetic materials are widely used in electronic and electrical products, and are one of the foundations of the material industry. They have special functions such as energy conversion and storage. At present, the soft magnetic composite material obtained by coating the insulating film on the surface of ferromagnetic particles has a series of unique properties compared with the traditional laminated rigid magnetic core, such as three-dimensional isotropic magnetic properties, extremely low eddy current loss, flexible core structure design, etc. It is precisely because of these characteristics that soft magnetic composite materials have broad application prospects.

[0003] The coating of insulati...

Examples

Embodiment 1

[0025] A kind of production method of the soft magnetic powder for inductance of high magnetic permeability described in the present embodiment, it comprises the following steps:

[0026] (1) Taking by weighing concentration is 40g of sodium hydroxide solution of 550g / L, concentration is 30g of sodium nitrite solution of 150g / L, concentration is 30g of sodium nitrate solution of 100g / L, above-mentioned three kinds of solutions are mixed to obtain bluish liquid , and then weighed 1000g of carbonyl iron powder, mixed carbonyl iron powder and bluish liquid in a mixing tank, heated while stirring, the stirring speed was 40rad / min, and the heating temperature was 110°C. After the water evaporated, the stirring and heating were stopped, and cooled to room temperature to obtain 1008 g of passivation powder coated with bluish film.

[0027] In the above operation, an over-temperature protection measure is also provided during heating, and the temperature of the over-temperature protec...

Embodiment 2

[0040] A kind of production method of the soft magnetic powder for inductance of high magnetic permeability described in the present embodiment, it comprises the following steps:

[0041] (1) Taking by weighing concentration is 18.75g of sodium hydroxide solution of 700g / L, concentration is 15.62g of sodium nitrite solution of 250g / L, concentration is 15.63g of sodium nitrate solution of 150g / L, above-mentioned three kinds of solutions are mixed to obtain For the bluing solution, weigh 1000 g of the ferrosilicon chromium alloy powder, mix the ferrosilicon chromium alloy and the bluing solution in a mixing tank, and heat while stirring. The stirring speed is 45 rad / min, and the heating temperature is 110° C. After the water evaporated, the stirring and heating were stopped, and cooled to room temperature to obtain 1005 g of passivation powder coated with a bluish film.

[0042] In the above operation, an over-temperature protection measure is also provided during heating, and t...

Embodiment 3

[0054] A kind of production method of the soft magnetic powder for inductance of high magnetic permeability described in the present embodiment, it comprises the following steps:

[0055] (1) Taking by weighing concentration is 27.59g of sodium hydroxide solution of 600g / L, concentration is 27.59g of sodium nitrite solution of 200g / L, and concentration is 24.83g of sodium nitrate solution of 125g / L, above-mentioned three kinds of solutions are mixed to obtain For the bluing solution, weigh 500g of iron-silicon-chromium alloy powder and 500g of carbonyl iron powder, mix the powder and the bluing solution in a mixing tank, and heat while stirring. The stirring speed is 50rad / min, and the heating temperature is 110°C. After the water evaporated, the stirring and heating were stopped, and cooled to room temperature to obtain 1006 g of passivation powder coated with bluish film.

[0056] In the above operation, an over-temperature protection measure is also provided during heating,...

technical field

[0001] The invention belongs to the technical field of magnetic functional materials, and in particular relates to a method for producing soft magnetic powder for inductance with high magnetic permeability and the soft magnetic powder. Background technique

[0002] Magnetic materials are widely used in electronic and electrical products, and are one of the foundations of the material industry. They have special functions such as energy conversion and storage. At present, the soft magnetic composite material obtained by coating the insulating film on the surface of ferromagnetic particles has a series of unique properties compared with the traditional laminated rigid magnetic core, such as three-dimensional isotropic magnetic properties, extremely low eddy current loss, flexible core structure design, etc. It is precisely because of these characteristics that soft magnetic composite materials have broad application prospects.

[0003] The coating of insulati...

Examples

Embodiment 1

[0025] A kind of production method of the soft magnetic powder for inductance of high magnetic permeability described in the present embodiment, it comprises the following steps:

[0026] (1) Taking by weighing concentration is 40g of sodium hydroxide solution of 550g / L, concentration is 30g of sodium nitrite solution of 150g / L, concentration is 30g of sodium nitrate solution of 100g / L, above-mentioned three kinds of solutions are mixed to obtain bluish liquid , and then weighed 1000g of carbonyl iron powder, mixed carbonyl iron powder and bluish liquid in a mixing tank, heated while stirring, the stirring speed was 40rad / min, and the heating temperature was 110°C. After the water evaporated, the stirring and heating were stopped, and cooled to room temperature to obtain 1008 g of passivation powder coated with bluish film.

[0027] In the above operation, an over-temperature protection measure is also provided during heating, and the temperature of the over-temperature protec...

Embodiment 2

[0040] A kind of production method of the soft magnetic powder for inductance of high magnetic permeability described in the present embodiment, it comprises the following steps:

[0041] (1) Taking by weighing concentration is 18.75g of sodium hydroxide solution of 700g / L, concentration is 15.62g of sodium nitrite solution of 250g / L, concentration is 15.63g of sodium nitrate solution of 150g / L, above-mentioned three kinds of solutions are mixed to obtain For the bluing solution, weigh 1000 g of the ferrosilicon chromium alloy powder, mix the ferrosilicon chromium alloy and the bluing solution in a mixing tank, and heat while stirring. The stirring speed is 45 rad / min, and the heating temperature is 110° C. After the water evaporated, the stirring and heating were stopped, and cooled to room temperature to obtain 1005 g of passivation powder coated with a bluish film.

[0042] In the above operation, an over-temperature protection measure is also provided during heating, and t...

Embodiment 3

[0054] A kind of production method of the soft magnetic powder for inductance of high magnetic permeability described in the present embodiment, it comprises the following steps:

[0055] (1) Taking by weighing concentration is 27.59g of sodium hydroxide solution of 600g / L, concentration is 27.59g of sodium nitrite solution of 200g / L, and concentration is 24.83g of sodium nitrate solution of 125g / L, above-mentioned three kinds of solutions are mixed to obtain For the bluing solution, weigh 500g of iron-silicon-chromium alloy powder and 500g of carbonyl iron powder, mix the powder and the bluing solution in a mixing tank, and heat while stirring. The stirring speed is 50rad / min, and the heating temperature is 110°C. After the water evaporated, the stirring and heating were stopped, and cooled to room temperature to obtain 1006 g of passivation powder coated with bluish film.

[0056] In the above operation, an over-temperature protection measure is also provided during heating,...