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Permanent magnetic ferrite and permanent magnetic ferrite molding method utilizing biomass binder

A technology of permanent ferrite and molding method, which is applied in the field of permanent ferrite manufacturing, can solve harmful and unfavorable industrial production problems, and achieve the effect of reducing costs

Active Publication Date: 2019-11-22
HAIAN INST OF HIGH TECH RES NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this method is mass-produced, the melting of the wax will produce a large amount of dense smoke, which is harmful to the human body and the environment, so it is not conducive to industrial production

Method used

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  • Permanent magnetic ferrite and permanent magnetic ferrite molding method utilizing biomass binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] S1 Prepare sodium alginate, dissolve alginic acid in water, add dropwise sodium hydroxide solution to neutralize to pH 7, add activated carbon to absorb impurities, and obtain filtrate by suction filtration, add ethanol to the filtrate, filter the precipitated solid product, and ball mill to a particle size of 75 μm to obtain sodium alginate;

[0024] S2 prepares the concentrate, selects Y38 pre-fired fine magnetic powder on the market, mixes the pre-fired fine magnetic powder with sodium alginate, wherein sodium alginate accounts for 10wt%, pre-fired fine magnetic powder accounts for 90wt%, and evenly adds 1.2 Wt% atomized water, mixed and stirred evenly, then dispersed with high-speed dispersant;

[0025] S3 prepares the molding material, weighs the concentrated material obtained in step S2 and Y38 calcined fine magnetic powder and mixes it with a mass ratio of 1:9, then adds calcium stearate with a weight of 1.0wt% of the mixture, mixes and stirs evenly, and uses a h...

Embodiment 2

[0029] S1 Prepare sodium alginate, dissolve alginic acid in water, add dropwise sodium hydroxide solution to neutralize to pH 7, add activated carbon to absorb impurities, and obtain filtrate by suction filtration, add ethanol to the filtrate, filter the precipitated solid product, and ball mill to a particle size of 70 μm to obtain sodium alginate;

[0030] S2 prepares the concentrate, selects Y38 calcined material fine magnetic powder on the market, mixes calcined material fine magnetic powder with sodium alginate, wherein sodium alginate accounts for 15wt%, calcined material fine magnetic powder accounts for 85wt%, evenly adds 1.4 Wt% atomized water, mixed and stirred evenly, then dispersed with high-speed dispersant;

[0031] S3 prepares molding materials, weighs the concentrated material obtained in step S2 and Y38 calcined material fine magnetic powder and mixes them with a mass ratio of 1:9, then adds calcium stearate with a weight of 0.8wt% of the mixture, mixes and st...

Embodiment 3

[0035] S1 Prepare sodium alginate, dissolve alginic acid in water, add dropwise sodium hydroxide solution to neutralize to pH 7, add activated carbon to absorb impurities, and obtain filtrate by suction filtration, add ethanol to the filtrate, filter the precipitated solid product, and ball mill to a particle size of 60 μm to obtain sodium alginate;

[0036] S2 prepares the concentrate, selects Y38 pre-fired fine magnetic powder on the market, mixes the pre-fired fine magnetic powder with sodium alginate, wherein sodium alginate accounts for 20wt%, pre-fired fine magnetic powder accounts for 80wt%, and evenly adds 1.6 Wt% atomized water, mixed and stirred evenly, then dispersed with high-speed dispersant;

[0037] S3 prepares molding materials, weighs the concentrated material obtained in step S2 and Y38 pre-fired fine magnetic powder and mixes it with a mass ratio of 1:9, then adds calcium stearate with a weight of 0.7wt% of the mixture, mixes and stirs evenly, and uses a hig...

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Abstract

The invention discloses a permanent magnetic ferrite and a permanent magnetic ferrite molding method utilizing biomass binder. The molding method sequentially comprises the following steps: S1, preparing sodium alginate; S2, preparing a concentrated material; S3, preparing a molding material; S4, performing compression molding; and S5 sinter molding. The permanent magnetic ferrite and the method have the advantages that harm to human bodies and pollution to the environment caused by use of camphor are avoided, meanwhile, the price of the biomass binder is far lower than that of the camphor, the production cost is reduced to a great extent, and the sintered permanent magnetic ferrite has the same magnetic performance.

Description

technical field [0001] The present application relates to the field of manufacturing permanent magnet ferrite, in particular to a method for forming permanent magnet ferrite with a biomass binder. Background technique [0002] In the traditional production of dry-pressed anisotropic permanent magnet ferrite, in order to make the magnetic particles have a good orientation, the friction coefficient between the magnetic particles is required to be small, that is, the particles are required to have a certain degree of dispersion and lubricity; at the same time, in order to achieve The required mechanical strength also requires a certain cohesion between the particles. Pure ferrite powder is difficult to meet such requirements, so it is necessary to add a molding binder during the production process. At present, camphor is basically used as a binder in industrial production, and calcium stearate is used as a molding auxiliary agent. Camphor is easy to volatilize at room temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/636C04B35/632C04B35/626C04B35/622C04B35/26
CPCC04B35/636C04B35/62605C04B35/622C04B35/26C04B35/632C04B35/62685C04B2235/602C04B2235/656C04B2235/6567
Inventor 雷成龙涂巍巍
Owner HAIAN INST OF HIGH TECH RES NANJING UNIV
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