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Ferrite magnetic material and ferrite sintered magnet

A technology of ferrite magnets and magnetic materials, applied in the fields of inorganic material magnetism, chemical instruments and methods, inductance/transformer/magnet manufacturing, etc., can solve the problems of insufficient magnetic properties of magnets, unsatisfactory magnetic properties

Inactive Publication Date: 2019-02-05
UNION MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem that the magnetic properties of the magnet obtained according to Patent Document 2 are not sufficiently high compared with conventional Sr-ferrite magnets (Patent Document 1)
[0014] As mentioned above, ferrite magnetic materials of known composition are more expensive than what is required in the market and still have unsatisfactory magnetic properties

Method used

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  • Ferrite magnetic material and ferrite sintered magnet
  • Ferrite magnetic material and ferrite sintered magnet
  • Ferrite magnetic material and ferrite sintered magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0062] Hereinafter, the present invention is explained in more detail by the following examples. However, the following examples are intended to further illustrate the invention without limiting its scope thereto.

Embodiment

[0064] Reference example: Measurement of magnetic properties and density

[0065] The maximum magnetic energy product ((BH) max ). Furthermore, the sintered ferrite magnets were each cut into a width of 5 mm and a thickness of 5 mm, and then their saturation magnetization (4πIs) in the first quadrant of the 4πI-H curve was measured for planes perpendicular to and parallel to the orientation plane, respectively. and the anisotropic magnetic field (H A ). The density of ferrite magnets is measured by the Archimedes method.

preparation example 1-1

[0067] Preparation Example 1-1: Mixing Process

[0068] Iron Oxides (Fe with a purity of 99% or greater 2 o 3 ), strontium carbonate (SrCO 3 ), calcium carbonate (CaCO 3 ), lanthanum oxide (La 2 o 3 ) and cobalt oxide (Co 3 o 4 ) were used as starting materials. Blending these starting materials to make Ca (1-x-y) Sr x La y Fe (2n-m) co m o 19 A ferrite magnet that satisfies the composition shown in Table 1 below. In order to promote the ferrite reaction, based on its total weight, 0.1 wt% H 3 BO 3 . The blend material was mixed with water to a concentration of 40% by weight, followed by wet cycle mixing for 2 hours. The raw material thus obtained was dried at 130° C. for 24 hours.

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Abstract

The present invention provides a ferrite magnetic material capable of inducing inexpensive high saturation magnetization and a high anisotropic magnetic field by adding a low amount of La and Co, thereby providing a maximum magnetic energy product ((BH)max) remarkably higher than that of a conventional ferrite magnetic material.

Description

technical field [0001] The present invention relates to magnetic materials that are inexpensive and capable of providing a high maximum energy product ((BH) max ) of ferrite magnetic materials, and sintered ferrite magnets using them. Background technique [0002] Ferrite has a magnetoplumbite type (or M type) hexagonal crystal structure. Ferrite is a material whose magnetic properties are not easily changed by the direction and magnitude of a magnetic field. It is generally used as a material for permanent magnets to be used in automobile motors, rotors for electrical equipment, and the like. Ferrite is characterized by its cheapness, since it is produced by the usual method for making ceramics from strontium carbonate and iron oxides, which is cheap among permanent magnetic materials. [0003] Meanwhile, due to environmental issues and various laws and regulations related to energy saving thereof, motors that have become smaller in size and more efficient have recently ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/64H01F1/36
CPCC04B35/64H01F1/36C04B35/2633C04B35/2641C04B2235/3208C04B2235/3213C04B2235/3227C04B2235/3275C04B2235/767C04B35/62645C04B2235/3409C04B35/62655C04B2235/5436C04B2235/5445C04B2235/3418C04B2235/449C04B35/6262C04B2235/605C04B2235/606C04B2235/604C04B2235/6567C01G51/68C01P2002/50C01P2002/52C01P2002/54C01P2004/61C01P2004/62C01P2006/42Y02T10/64C04B35/26C04B35/2683C04B35/62625C04B2235/3274H01F1/11H01F41/0266
Inventor 金民浩李东伶李政桓郑殷善
Owner UNION MATERIALS CORP
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