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Manufacturing method of dry-type anisotropic strontium ferrite

A strontium ferrite and anisotropic technology, which is applied in the field of dry anisotropic strontium ferrite manufacturing, can solve the problem that the viscosity and lubricity cannot achieve lubrication and dispersion effects, are not suitable for industrial production, and have high hardness. problem, to achieve the effect of good lubricity, forming and density improvement, and improving the degree of orientation

Active Publication Date: 2013-06-12
江门江益磁材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, camphor and calcium stearate are basically used as molding adhesives in industrial production. Although fatty acid ester waxes and other substances have been used in a small number of documents and patents, because they belong to natural vegetable waxes, they contain some refractory, Substances with a high melting point, after adding, a large number of honeycombs will appear on the surface of the sintered product. At the same time, their hardness is high, and their viscosity and lubricity cannot achieve good lubrication and dispersion effects, so they are not suitable for industrial production.

Method used

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  • Manufacturing method of dry-type anisotropic strontium ferrite
  • Manufacturing method of dry-type anisotropic strontium ferrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Adopt following steps to make product of the present invention:

[0027] (1) Preparation of pre-burned fine powder

[0028] Molebi Fe 2 o 3 : SrCO 3 =5.7:1 Weigh the raw material Fe 2 o 3 and SrCO 3 Mixing, drying and calcining to obtain calcined material. Use a vibration ball mill to coarsely crush the above calcined material into a coarse powder with an average particle size of 2-6 μm, and add 0.8wt% of the weight of the coarse powder to CaCO 3 and 0.3wt% SiO 2 Finally, it is finely crushed into a fine powder with an average particle size of 0.8 μm, and then dried to obtain a pre-calcined fine powder.

[0029] (2) Preparation of mixing concentrate

[0030] Weigh the calcined fine powder obtained in step (1) and mix it with synthetic wax, wherein the synthetic wax accounts for 1 wt%, and the pre-calcined fine powder accounts for 99 wt%, put the mixed material into an internal mixer, and mix while heating. When the temperature rises to 75°C, turn on the coolin...

Embodiment 2

[0036] Adopt the following steps to make product 4 of the present invention:

[0037] (1) Preparation of pre-burned fine powder

[0038] Molebi Fe 2 o 3 : SrCO 3 =5.8:1 Weigh raw material Fe 2 o 3 and SrCO 3 Mixing, drying and calcining to obtain calcined material. Use a vibration ball mill to coarsely crush the above calcined material into a coarse powder with an average particle size of 2-6 μm, and add 1.1wt% of the weight of the coarse powder to CaCO 3 and 0.2wt% SiO 2 Finally, it is finely crushed into a fine powder with an average particle size of 0.72 μm, and then dried to obtain a pre-calcined fine powder.

[0039] (2) Preparation of mixing concentrate

[0040] The calcined fine powder obtained in step (1) was weighed and mixed with synthetic wax, wherein the synthetic wax accounted for 6wt%, and the pre-calcined fine powder accounted for 94wt%, and the mixed material was put into an internal mixer, and mixed while heating. When the temperature rises to 75°C, ...

Embodiment 3

[0046] Adopt following steps to make product of the present invention:

[0047] (1) Preparation of pre-burned fine powder

[0048] Molebi Fe 2 o3 : SrCO 3 =5.9:1 Weigh the raw material Fe 2 o 3 and SrCO 3 Mixing, drying and calcining to obtain calcined material. Use a vibration ball mill to coarsely crush the above calcined material into a coarse powder with an average particle size of 2-6 μm, and add 1.25wt% of the weight of the coarse powder to CaCO 3 and 0.1wt% SiO 2 Finally, it is finely crushed into a fine powder with an average particle size of 0.65 μm, and then dried to obtain a pre-calcined fine powder.

[0049] (2) Preparation of mixing concentrate

[0050] The calcined fine powder obtained in step (1) was weighed and mixed with synthetic wax, wherein the synthetic wax accounted for 12wt%, and the pre-calcined fine powder accounted for 88wt%, and the mixed material was put into an internal mixer, and mixed while heating. When the temperature rises to 75°C, tu...

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Abstract

The invention relates to a manufacturing method of dry-type anisotropic strontium ferrite, which uses Fe2O3 and SrCO3 as raw materials, CaCO3 and SiO2 as additives, and synthetic wax and calcium stearate respectively as a binding agent and a forming assistant. The manufacturing method comprises the following steps: preparing presintered fine powder, preparing a compound concentrated material, preparing fine powder for formation, and forming by sintering. The synthetic wax is used as the binding agent instead the traditional camphor binding agent, thereby reducing the hazards to life and environmental pollution due to use of camphor; and besides, the density of the sintered body can be enhanced to avoid generating bee-holes on the product surface, thereby forming the dry-type anisotropic strontium ferrite with excellent magnetic properties.

Description

technical field [0001] The invention relates to a method for manufacturing ferrite, in particular to a method for manufacturing dry anisotropic strontium ferrite. Background technique [0002] In the traditional production process of dry anisotropic strontium ferrite, it is usually necessary to add camphor as a binder. It is easy to volatilize at room temperature and produce a large amount of pungent gas, which is harmful to the human body and causes great pollution to the environment. If industrial workers are exposed to large doses, it will cause cardiac paralysis and severe convulsions. At present, camphor and calcium stearate are basically used as molding adhesives in industrial production. Although fatty acid ester waxes and other substances have been used in a small number of documents and patents, because they belong to natural vegetable waxes, they contain some refractory, Substances with high melting points, after being added, a large number of honeycombs will app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/632
Inventor 吴捷潘欢欢温东强白钰王忆
Owner 江门江益磁材有限公司
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