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A kind of injection molding method of ferrite soft magnetic material

An injection molding, soft magnetic material technology, applied in grain processing and other directions, can solve the problems of low iron loss, difficult mass production, and complex shape of ferrite materials, and achieve the effects of high mechanical strength, high density, and uniform internal structure.

Active Publication Date: 2017-01-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that traditional dry pressing is difficult to mass-produce ferrite soft magnetic materials with thin walls, complex shapes, high precision, uniform density and structure. At the same time, by doping trace components, the obtained ferrite Material iron loss is relatively low

Method used

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  • A kind of injection molding method of ferrite soft magnetic material
  • A kind of injection molding method of ferrite soft magnetic material
  • A kind of injection molding method of ferrite soft magnetic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The raw materials selected in this embodiment are as shown in Table 1 by mass percentage:

[0017] Table 1

[0018]

[0019] The steps of injection molding to prepare ferrite are as follows:

[0020] (1) Powder preparation: Mix and grind the ferrite powder once, the speed of the ball mill is 200 r / min, and the ball milling time is 10 h. After drying with a spray dryer, the powder is pre-calcined at 700 ℃, and the pre-calcination time is After 2 h, the pre-calcined powder was crushed, and then mixed and milled for the second time, and the powder was ball milled to a particle size of 0.5-2 μm, and dried with a spray dryer. Among them, the primary mixed grinding and the secondary mixed grinding are all carried out by wet grinding method, adding 1 wt% dispersant, 8 wt% polyvinyl alcohol, 0.1 wt% defoamer, wherein the dispersant is composed of water and polypropylene .

[0021] (2) Mixing and granulation: After uniformly mixing the powder obtained in step 1) with the b...

Embodiment 2

[0027] The raw materials selected in this embodiment are as shown in Table 2 by mass percentage:

[0028] Table 2

[0029]

[0030] The steps of injection molding to prepare ferrite are as follows:

[0031] (1) Powder preparation: The ferrite powder was mixed and milled once, the speed of the ball mill was 225 r / min, and the ball milling time was 12 h. After drying, the powder was pre-calcined at 800 °C for 2 h. After the pre-fired powder is crushed, it is mixed and milled for the second time, and the powder is ball-milled to a particle size of 0.5-2 μm, and then dried. Among them, the primary mixed grinding and secondary mixed grinding are carried out by wet grinding method, adding 2 wt% dispersant, 5 wt% polyvinyl alcohol, 0.15 wt% defoamer, wherein the dispersant is composed of water and polypropylene .

[0032] (2) Mixing and granulation: After uniformly mixing the powder obtained in step 1) with the binder, kneading at 150 °C for 3 hours to obtain a mixture, and cru...

Embodiment 3

[0038] The raw material that present embodiment selects is as shown in table 3 by mass percentage:

[0039] table 3

[0040]

[0041] The steps of injection molding to prepare ferrite are as follows:

[0042] (1) Powder preparation: The ferrite powder was mixed and milled once, the speed of the ball mill was 250 r / min, and the ball milling time was 14 h. After drying, the powder was pre-calcined at 900 °C for 3 h. After the pre-calcined powder is crushed, it is mixed and milled for a second time. The ball milling time is 2 h. The particle size of the powder after ball milling is 0.5-2 μm, and then it is dried. Among them, the primary mixed grinding and the secondary mixed grinding are all carried out by wet grinding method, adding 1 wt% dispersant, 8 wt% polyvinyl alcohol, 0.2 wt% defoamer, wherein the dispersant is composed of water and polypropylene .

[0043] (2) Mixing and granulation: After uniformly mixing the powder obtained in step 1) with the binder, kneading at...

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Abstract

The invention discloses an injection forming method of a soft magnetic ferrite material.The method comprises the following steps of: 1) powder preparation: mixing and milling ferrite powder at one time, after dryness, presintering the powder, crushing the presintered powder for secondary mixing and milling, and performing drying treatment, 2) mixing and granulation: uniformly mixing the powder obtained in Step 1) with an adhesive, mixing to form a mixture, crushing the mixture, 3) injection forming: heating the crushed mixture, injecting into a mold cavity under a pressure condition, opening a mold for cooling, then obtaining a forming body, 4) degreasing: putting the forming body in trichloro ethylene for degreasing, drying, and then performing heat degreasing, and 5) sintering: sintering the degreased forming body to form the soft magnetic ferrite material.The method is suitable for preparing middle and small high-precision ferrite core devices in complicated shapes, and the prepared soft magnetic ferrite material has the characteristics of large and uniform density, uniform internal structure, high mechanical strength and relatively low iron loss.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and in particular relates to an injection molding method of a ferrite soft magnetic material. Background technique [0002] Soft magnetic ferrite materials are currently the soft magnetic materials with the largest market demand and the largest output. They are widely used in defense technology, communications, computers, radars, radio and television, medical and measuring instruments, entertainment and consumer electronics, industry and office automation, automobiles, etc. Basic industries of the national economy such as electronics and lighting. At present, the molding method of ferrite cores in industrial production is mainly dry pressing, which has great restrictions on the shape of the core, and has low strength of the green body, and the internal density of the sintered core is not uniform and the structure is relatively uniform. Poor, easy to crack and other limitati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/14B02C17/10C04B35/26C04B35/622
CPCB02C17/10B28B1/24C04B35/2633C04B35/622
Inventor 严密陈海平吴琛王新华
Owner ZHEJIANG UNIV
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