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Permanent magnetic ferrite sintered magnet injection moulding granule material and preparation method and application thereof

A technology of permanent ferrite and sintered magnets, applied in the direction of inductance/transformer/magnet manufacturing, magnetic materials, magnetic objects, etc., to achieve low viscosity, improve dispersion uniformity, and improve the effect of bending deformation

Active Publication Date: 2017-09-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a novel binder system with a modified wax matrix as the main component. Compared with the pure paraffin system binder, the binder has good processing fluidity, and the powder is dispersed in the binder. Good uniformity, especially can improve the defects such as bending and deformation of the green body during the solvent degreasing process, and improve the degreasing efficiency

Method used

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  • Permanent magnetic ferrite sintered magnet injection moulding granule material and preparation method and application thereof
  • Permanent magnetic ferrite sintered magnet injection moulding granule material and preparation method and application thereof
  • Permanent magnetic ferrite sintered magnet injection moulding granule material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The components and volume fractions of the pellets are as follows:

[0030]

[0031] Wherein: the volume fraction of each component of the modified wax matrix is ​​as follows:

[0032] Carnauba Wax 70%

[0033] Polyamide Wax 25%

[0034] Microcrystalline Wax 5%

[0035] According to the above formula, mix carnauba wax (8015-86-9), polyamide wax (NEW-0404) and microcrystalline wax (No. 80) at 100°C to obtain modified wax matrix particles; High-density polyethylene (8050), modified wax matrix, stearic acid (57-11-4) and strontium ferrite powder are mixed evenly, and then extruded and granulated in a twin-screw extruder to obtain mixed feed. The rotational speed is 20rad / s, the rotational speed of the feeder is 16rad / s, and the temperature of the extruder is 130, 130, 135, 140, 140°C from the feed port to the discharge port. Injection-molding the prepared pellets on an injection-molding machine to obtain an injection-molded green body of a sintered magnet. The inje...

Embodiment 2

[0037] The components and volume fractions of the pellets are as follows:

[0038]

[0039]

[0040] Wherein: the volume fraction of each component of the modified wax matrix is ​​as follows:

[0041] Carnauba Wax 70%

[0042] Polyamide Wax 25%

[0043] Microcrystalline Wax 5%

[0044]According to the above formula, mix carnauba wax (8015-86-9), polyamide wax (NEW-0404) and microcrystalline wax (No. 80) at 100°C to obtain modified wax matrix particles; High-density polyethylene (8050), modified wax matrix, stearic acid (57-11-4) and strontium ferrite powder are mixed evenly, and then extruded and granulated in a twin-screw extruder to obtain mixed feed. The rotational speed is 20rad / s, the rotational speed of the feeder is 16rad / s, and the temperature of the extruder is 130, 130, 135, 140, 140°C from the feed port to the discharge port. Injection-molding the prepared pellets on an injection-molding machine to obtain an injection-molded green body of a sintered magnet...

Embodiment 3

[0046] The components and volume fractions of the pellets are as follows:

[0047]

[0048] Wherein: the volume fraction of each component of the modified wax matrix is ​​as follows:

[0049] Carnauba Wax 70%

[0050] Polyamide Wax 25%

[0051] Microcrystalline Wax 5%

[0052] According to the above formula, mix carnauba wax (8015-86-9), polyamide wax (NEW-0404) and microcrystalline wax (No. 80) at 100°C to obtain modified wax matrix particles; High-density polyethylene (8050), modified wax matrix, stearic acid (57-11-4) and strontium ferrite powder are mixed evenly, and then extruded and granulated in a twin-screw extruder to obtain mixed feed. The rotational speed is 20rad / s, the rotational speed of the feeder is 16rad / s, and the temperature of the extruder is 130, 130, 135, 140, 140°C from the feed port to the discharge port. Injection-molding the prepared pellets on an injection-molding machine to obtain an injection-molded green body of a sintered magnet. The inje...

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Abstract

The invention discloses a permanent magnetic ferrite injection moulding granule material and a preparation method thereof. Strontium ferrite powder is mixed with high density polyethylene, a modified wax matrix, a surface modifier and a plasticizer, then, mixed materials are added into a double-screw extruder to be subjected to extrusion granulating and prepared into feeding materials, then, injection moulding is conducted to prepare raw bases, after two steps of solvent degreasing and heat degreasing, degreased bases are obtained, and finally, high-temperature sintering is conducted to obtain sintered magnetic permanent magnetic ferrite devices. Because the novel modified wax matrix is adopted, the obtained granule material has good fluidity and shape preservation performance, at the same time, the defects such as bending and deformation in the solvent degreasing process of injection molding parts are improved, and the degreasing efficiency is high.

Description

technical field [0001] The invention relates to the field of ceramic powder injection molding, in particular to a permanent ferrite sintered magnet injection molding granular material and its preparation and application. Background technique [0002] Ceramic powder injection molding technology is a molding method that combines traditional polymer injection molding technology and powder metallurgy technology. It has great potential for near-net shape production parts. Its advantage is that it can manufacture complex shapes and high precision in large quantities with high efficiency. , high-performance small precision parts, and thus get more and more attention. At present, due to the miniaturization of electronic equipment, there is an increasing need for small and complex components. Some complex ferrite magnetic devices have been successfully produced using powder injection molding technology. [0003] Ceramic powder injection molding technology includes four stages of mix...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/634C04B35/626C08L23/06C08L91/06C08L77/00C08K13/02C08K5/09C08K5/11C08K3/24H01F1/113H01F41/02
CPCC04B35/2683C04B35/62695C04B35/63496C04B2235/5445C08K2201/01C08L23/06C08L2205/025C08L2205/035C08L2207/062H01F1/113H01F41/0253C08L91/06C08L77/00C08K13/02C08K5/09C08K5/11C08K3/24
Inventor 乔梁叶益郑精武应耀李旺昌余靓车声雷
Owner ZHEJIANG UNIV OF TECH
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