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Composite magnetic material and preparation method thereof

A technology of composite magnetic materials and materials, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of engineers' selection of materials, low saturation magnetic flux density, uncoordinated and other problems, and achieve excellent balance performance and high saturation magnetic flux. The effect of density, high performance output

Active Publication Date: 2017-02-01
GUANGDONG DECE TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are two main types of magnetic materials used in integral molding, reduced iron powder and carbonyl iron powder. The magnetic permeability of reduced iron powder is relatively high (70~100μ), but the saturation magnetic flux density is very low (about 0.9T), which is only suitable for High inductance and low current requirements; carbonyl iron powder saturation flux density is very high (about 1.4T), but the magnetic permeability is very low (20~35μ), only suitable for high current and low inductance occasions, the two cannot be coordinated, give engineers The selection of materials caused great trouble
At present, the magnetic materials on the market are generally high magnetic permeability low DC superposition, low magnetic permeability high DC superposition and other magnetic permeability and DC superposition characteristics. For some special occasions, usually only one of the properties can be sacrificed, or both. reduced

Method used

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  • Composite magnetic material and preparation method thereof
  • Composite magnetic material and preparation method thereof
  • Composite magnetic material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0045] The preparation method of a kind of novel composite magnetic material of the present embodiment comprises the following steps:

[0046] (1) Taking materials and mixing: Take 600g of 200 mesh pure iron powder, 300g of 500 mesh carbonyl iron powder, 100g of 500 mesh iron-silicon alloy powder with a silicon content of 6.5%, and mix them evenly;

[0047] (2) Roasting: After mixing evenly, bake to 60°C

[0048] (3) Phosphating: Add 15ml of phosphoric acid solution with a concentration of 2.5%, stir evenly, continue to bake for 10 minutes, and the surface of the magnetic material will have a phosphate conversion coating after phosphating;

[0049] (4) Inorganic coating: add 5g of silica gel (silicon glass glue), fry until dry, and the outer surface of the magnetic material is protected by an inorganic coating layer;

[0050] (5) Cooling and screening: After cooling, pass through 300 mesh, 200 mesh and 100 mesh drying nets respectively to obtain -300 mesh 15%, +300 mesh~-200 ...

Embodiment 2

[0066] The main technical solutions of this embodiment are basically the same as those of Embodiment 1, and the features not explained in this embodiment are explained in Embodiment 1, and will not be repeated here. The difference between this embodiment and embodiment 1 is:

[0067] (1) Feed and mix: 500g iron powder, 400g carbonyl iron powder, 100g iron-silicon alloy powder with 6% silicon content;

[0068] (2) Roasting: Roasting until the temperature is 50°C

[0069] (3) Phosphating: add 10ml of 3% phosphoric acid solution, continue to bake for 5 minutes;

[0070] (4) Inorganic coating: add 2g of silica gel (silicon glass glue);

[0071] (5) Cooling and sieving; after cooling, pass through 300 mesh, 200 mesh and 100 mesh drying nets respectively to obtain -300 mesh 20%, +300 mesh~-200 mesh 40%, +200 mesh~-100 mesh 20 % +100 mesh 20% powder;

[0072] (6) Baking: The temperature of the oven is set to rise from room temperature to 50±5°C for 20 minutes, and then to 80±5°C ...

Embodiment 3

[0076] The main technical solutions of this embodiment are basically the same as those of Embodiment 1, and the features not explained in this embodiment are explained in Embodiment 1, and will not be repeated here. The difference between this embodiment and embodiment 1 is:

[0077] (1) Taking and mixing: 700g iron powder, 250g carbonyl iron powder, 50g iron-silicon alloy powder with 8% silicon content;

[0078] (2) Roasting: Roasting until the temperature is 75°C

[0079] (3) Phosphating: add 20ml of 3% phosphoric acid solution, and continue to bake for 15 minutes;

[0080] (4) Inorganic coating: add 8g of silica gel (silicon glass glue);

[0081] (5) Cooling and screening: After cooling, pass through 300 mesh, 200 mesh and 100 mesh drying nets respectively to obtain -300 mesh 10%, +300 mesh~-200 mesh 50%, +200 mesh~-100 mesh 30 % +100 mesh 10% powder;

[0082] (6) Baking: The temperature of the oven is set to rise from room temperature to 50±5°C for 40 minutes, and then...

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Abstract

The invention relates to a composite magnetic material which comprises the following components: 50 to 70% of iron powder, 20 to 40% of carbonyl iron powder and 5 to 15% of iron-silicon alloy powder, wherein silicon content of the iron-silicon alloy powder is 6 to 7%. A surface of the composite magnetic material is phosphatized to form a phosphate conversion coating, and an inorganic coating layer protects the outer surface of the phosphate conversion coating. A preparation method of the composite magnetic material, which is disclosed by the invention, comprises the following steps of: (1) material taking and mixing; (2) baking and stir-frying; (3) phosphorization; (4) inorganic coating; (5) cooling and screening; and (6) baking. According to the invention, the preparation method is optimized, and the obtained composite magnetic material has excellent performance of balancing high conductivity and high saturation.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a composite magnetic material and a preparation method thereof. Background technique [0002] Inductor is an indispensable component of electronic circuit. It plays the role of filtering, choking and energy storage in the circuit. It is composed of conductor coil and magnetic conductor; there are mainly in-line (DIP) and surface mount (SMD) ) two kinds. If the inductor is to be applied to more occasions, the most influential factor is the magnetic material, because the conditions of the magnetic material itself limit the operating frequency band, inductance, quality factor Q, and operating current of the inductor. [0003] There are two main types of magnetic materials used in integral molding, reduced iron powder and carbonyl iron powder. The magnetic permeability of reduced iron powder is relatively high (70~100μ), but the saturation magnetic flux density is very lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F1/24B22F1/02
CPCH01F1/14766H01F1/24B22F1/145B22F1/16B22F1/10
Inventor 唐建伟汪民
Owner GUANGDONG DECE TECH LTD
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