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Process for clinkering anisotropic permanent ferrite through polymer bonding and modeling

A permanent ferrite, anisotropic technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, adhesives, etc., can solve the problems of increasing production costs, harmful to human body, heavy camphor smell, etc., and achieve high magnetic performance and low cost Low, no effect on health

Inactive Publication Date: 2005-09-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor particle orientation of traditional dry-pressed products, the magnetic properties of the products are often only 80-90% of the same level of magnetic powder wet-pressed products. In order to achieve the same magnetic properties of wet-pressed products, dry-pressed products need to use high The high-grade magnetic powder greatly increases the production cost; on the other hand, the binder used in the traditional dry pressing method is generally camphor, which is a volatile and highly irritating substance harmful to the human body. Can paralyze cardiac activity, causing severe convulsions
Due to the strong smell of camphor, if the production personnel do not wear gas masks, they cannot enter the production workshop at all.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Use Y30BH grade strontium ferrite powder SrO·(Fe 2 o 3 ) 6, after secondary grinding, drying and crushing, the particle size is 1.06-1.11μm. Fully mix 2g polyethylene glycol and 198g strontium ferrite powder with a V-0.002 high-efficiency mixer for 1 hour, then pass the mixture through a 200-mesh sieve, and disperse it with a micro high-speed disperser to obtain a molding powder Then heat the molding powder and the molding mold to 110°C and 130°C respectively, put the molding powder into the cavity of the mold, and press it under an orientation magnetic field of 8kOe to obtain a green body of ferrite; The green body of ferrite is put into a roller kiln and sintered at 1250°C for 1.5 hours to obtain anisotropic permanent magnet ferrite.

Embodiment 2

[0029] 3g of polyethylene glycol was fully mixed with 197g of strontium ferrite powder, and the others were the same as in Example 1.

Embodiment 3

[0031] Polymer binder selects polyethylene wax for use, and others are the same as embodiment 1.

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Abstract

The invention discloses a method for sintering anisotropic permanent ferrite by binding molding of polymer, comprising the following preparing steps: fully mixing ferrite powder with polymer binder accounting for 0.1-3.0% of the total weight of raw materials to obtain molding powder; then heating the molding material and a mould to 60-150 deg.C, placing the molding powder in the mould and making pressure molding under external oriented magnetic field so as to obtain blanks; finally sintering the blanks at the stable temperature of 1200-1280 deg.C to make it. The invention is low-cost, and the obtained ferrite has high magnetic property and has no pollution to the environment and has no effect on the health of producing personnel.

Description

technical field [0001] The invention relates to a manufacturing method of permanent magnet ferrite, in particular to a method for polymer bonding, forming and sintering anisotropic permanent magnet ferrite. Background technique [0002] As a traditional magnetic energy storage material, the main application fields of permanent magnet ferrite are motors and speakers, which are widely used in automobiles, motorcycles, various audio-visual systems, computer peripherals and OA equipment, and various electrical appliances in daily life. [0003] Permanent magnet ferrite can be divided into isotropic and anisotropic permanent magnet ferrite according to different performance requirements and production methods. Among them, the distribution of magnetic particles of isotropic permanent magnet ferrite is basically chaotic, but its production process is simple and economical, and it is mostly used in occasions that do not require high magnetic properties; a...

Claims

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Application Information

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IPC IPC(8): C09J167/00C09J169/00C09J177/00H01F1/10H01F1/113H01F41/02
Inventor 曾德长傅如闻余红雅刘正义谢金强王亚洲
Owner SOUTH CHINA UNIV OF TECH
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