A kind of iron-based soft magnetic composite material and preparation method thereof

Abstract

The invention discloses an iron-based soft magnetic composite. The iron-based soft magnetic composite comprises atomized iron-based powder, ultra-fine high melting point inorganics and lubricant, wherein phosphate and an organic silicone resin insulating layer cover the surface of the atomized iron-based powder. A preparation method of the iron-based soft magnetic composite comprises the following steps that the atomized iron-based powder and the ultra-fine high melting point inorganics are fully mixed to obtain a mixture, high-temperature heating treatment is conducted on the mixture in a non-oxidizing atmosphere, heat preservation is conducted on the mixture for above 30min, the mixture is cooled to enable the temperature of the mixture to be the room temperature, surface phosphating treatment and organic silicon resin covering are conducted on obtained iron powder isolated through the inorganics, and then pressing annealing is carried out. Due to the fact that the iron powder is isolated through the ultra-fine high melting point inorganics, annealing can be conducted on the iron powder at a high temperature of about 1000 DEG C, sintering cannot happen, and the iron powder has high compressibility; an insulating layer covers the surface of the iron powder after phosphating treatment is conducted on the iron powder, phosphide has a lubricating effect on the iron powder, internal friction is reduced in the pressing process, and the compaction density of the powder is improved; due to the fact that organic silicon resin is added, distribution of the insulating layer on the surface of the iron powder is improved, and the soft magnetic property is optimized after forming sintering is conducted on the powder.

Description

technical field

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

[0002] New high-performance iron-based soft magnetic composites (Iron soft magnetic composites) play an extremely important role in the development of various electronic products to achieve high precision, high sensitivity, large capacity, and miniaturization. The key to the preparation of ISMC materials is to insulate and coat the magnetic particles, which not only can effectively reduce high-frequency eddy current loss, but also combines the production advantages of powder metallurgy technology, and has been widely used in aviation, automobiles, household appliances and other fields. In order to make up for the low heat treatment temperature and low mechanical strength of iron-resin SMC materials, people began to try to comb...

Examples

Embodiment 1

[0023] The iron-based powders used in the examples of the present invention are common water-atomized pure iron powders purchased commercially. For example, the iron powder with a grade of 300W is preferred, among which the iron powder with a particle size within the range of 30-50 μm is the raw material for the high-frequency soft magnetic powder core, and an inorganic substance with a particle size within the range of 50-500 nm is selected as ultra-fine insulating spacer powder. Nano-alumina is preferred, and the two powders are mixed by stirring, wherein the mass percentage of nano-inorganic powder is 0.8%.

[0024] The uniformly mixed iron powder raw materials are put into a mesh belt heating furnace for heating and annealing, and the holding temperature is controlled within the range of 900-1100 °C, preferably 1000 °C here, and the holding time is 30 minutes. A non-oxidizing atmosphere was maintained in the furnace during heating and cooling to room temperature. The obta...

Embodiment 2

[0029] Choose ordinary water atomized pure iron powder, among which the iron powder with a particle size in the range of 100-280 μm is preferred as the raw material for low-frequency soft magnetic powder cores, more preferably the iron powder content of 100-150 μm is not more than 3%, and the iron powder with a particle size of 150-180 μm The content of iron powder is not more than 16%, and the rest is 180-280μm iron powder. Another inorganic substance with a particle size range of 50-500nm is ultra-fine insulating spacer powder. Here, nano-alumina is preferred. The two powders are mixed by stirring, and the mass percentage of nano-inorganic powder does not exceed 0.5%.

[0030] The uniformly mixed iron powder raw materials are put into a mesh belt heating furnace for heating and annealing, and the holding temperature is controlled within the range of 900-1100°C, preferably 1050°C here, and holding for 30 minutes. A non-oxidizing atmosphere was maintained in the furnace during...

Embodiment 3

[0035]Ordinary water atomized iron powder is selected, among which the iron powder with a particle size within the range of 100-280 μm is preferred as the raw material, and an inorganic substance with a particle size within the range of 50-500 nm is selected as ultra-fine insulating powder. Here, nano-silicon oxide is preferred. The powders are stirred and mixed, and the mass percentage of the nano-inorganic powder does not exceed 0.5%.

[0036] The uniformly mixed iron powder raw materials are put into a mesh belt heating furnace for heating and annealing, and the holding temperature is controlled within the range of 900-1100°C, preferably 1050°C here, and holding for 30 minutes. A non-oxidizing atmosphere was maintained in the furnace during heating and cooling to room temperature.

[0037] After the above mixed powder is processed, add a certain amount of iron-based phosphating solution by spraying. Here, the SD302 iron-based room temperature phosphating solution purchased ...

technical field

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

[0002] New high-performance iron-based soft magnetic composites (Iron soft magnetic composites) play an extremely important role in the development of various electronic products to achieve high precision, high sensitivity, large capacity, and miniaturization. The key to the preparation of ISMC materials is to insulate and coat the magnetic particles, which not only can effectively reduce high-frequency eddy current loss, but also combines the production advantages of powder metallurgy technology, and has been widely used in aviation, automobiles, household appliances and other fields. In order to make up for the low heat treatment temperature and low mechanical strength of iron-resin SMC materials, people began to try to comb...

Examples

Embodiment 1

[0023] The iron-based powders used in the examples of the present invention are common water-atomized pure iron powders purchased commercially. For example, the iron powder with a grade of 300W is preferred, among which the iron powder with a particle size within the range of 30-50 μm is the raw material for the high-frequency soft magnetic powder core, and an inorganic substance with a particle size within the range of 50-500 nm is selected as ultra-fine insulating spacer powder. Nano-alumina is preferred, and the two powders are mixed by stirring, wherein the mass percentage of nano-inorganic powder is 0.8%.

[0024] The uniformly mixed iron powder raw materials are put into a mesh belt heating furnace for heating and annealing, and the holding temperature is controlled within the range of 900-1100 °C, preferably 1000 °C here, and the holding time is 30 minutes. A non-oxidizing atmosphere was maintained in the furnace during heating and cooling to room temperature. The obta...

Embodiment 2

[0029] Choose ordinary water atomized pure iron powder, among which the iron powder with a particle size in the range of 100-280 μm is preferred as the raw material for low-frequency soft magnetic powder cores, more preferably the iron powder content of 100-150 μm is not more than 3%, and the iron powder with a particle size of 150-180 μm The content of iron powder is not more than 16%, and the rest is 180-280μm iron powder. Another inorganic substance with a particle size range of 50-500nm is ultra-fine insulating spacer powder. Here, nano-alumina is preferred. The two powders are mixed by stirring, and the mass percentage of nano-inorganic powder does not exceed 0.5%.

[0030] The uniformly mixed iron powder raw materials are put into a mesh belt heating furnace for heating and annealing, and the holding temperature is controlled within the range of 900-1100°C, preferably 1050°C here, and holding for 30 minutes. A non-oxidizing atmosphere was maintained in the furnace during...

Embodiment 3

[0035]Ordinary water atomized iron powder is selected, among which the iron powder with a particle size within the range of 100-280 μm is preferred as the raw material, and an inorganic substance with a particle size within the range of 50-500 nm is selected as ultra-fine insulating powder. Here, nano-silicon oxide is preferred. The powders are stirred and mixed, and the mass percentage of the nano-inorganic powder does not exceed 0.5%.

[0036] The uniformly mixed iron powder raw materials are put into a mesh belt heating furnace for heating and annealing, and the holding temperature is controlled within the range of 900-1100°C, preferably 1050°C here, and holding for 30 minutes. A non-oxidizing atmosphere was maintained in the furnace during heating and cooling to room temperature.

[0037] After the above mixed powder is processed, add a certain amount of iron-based phosphating solution by spraying. Here, the SD302 iron-based room temperature phosphating solution purchased ...

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