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Sintered ferrite magnet and motor provided therewith

A technology of sintered magnets and ferrites, which is applied to magnetic circuits, magnetic objects, and magnetic materials characterized by magnetic materials, can solve the problem of difficulty in greatly improving the magnetic properties of ferrite sintered magnets, and achieve excellent reliability , the effect of high efficiency

Active Publication Date: 2014-11-05
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to greatly improve the magnetic properties of existing ferrite sintered magnets only by controlling the composition of crystal grains

Method used

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  • Sintered ferrite magnet and motor provided therewith
  • Sintered ferrite magnet and motor provided therewith
  • Sintered ferrite magnet and motor provided therewith

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8、 comparative example 1～17

[0082] (Manufacturing of ferrite sintered magnets)

[0083] First, prepare the following initial ingredients.

[0084] · Fe 2 CO 3 Powder (primary particle size: 0.3μm)

[0085] ·SrCO 3 Powder (primary particle size: 2μm)

[0086] ·SiO2 2 Powder (primary particle size: 0.01μm)

[0087] ·CaCO 3 powder

[0088] ·Na 2 CO 3 powder

[0089] Crush and mix 1000g of Fe with a wet mill 2 CO 3 Powder, 161.2 g of SrCO 3 powder and 2.3g of SiO 2 powder, dried and granulated. The powder thus obtained was fired at 1250°C in air for 3 hours to obtain a granular calcined product. The calcined product was coarsely pulverized using a dry vibrating rod mill to prepare a product with a specific surface area of ​​1 m measured by the BET method. 2 / g of powder.

[0090] Add specified amount of sorbitol and SiO to 130g of coarsely pulverized powder 2 Powder and CaCO 3 The powder was subjected to wet pulverization with a ball mill for 21 hours to obtain a slurry. The amount of so...

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Abstract

The present invention provides a sintered ferrite magnet (10) that contains strontium ferrite having a hexagonal crystal structure. Expressed in terms of Na2O and K2O, the combined sodium and potassium content of said sintered ferrite magnet (10) is 0.01-0.09% by mass; expressed in terms of SiO2, the silicon content is 0.1-0.29% by mass; and the sintered ferrite magnet (10) satisfies relation (1). (1) 2.5 <= (SrF+Ba+Ca+2Na+2K) / Si <= 5.4 (In relation (1), SrF represents the amount of strontium, on a molar basis, other than the strontium constituting the strontium ferrite, and Ba, Ca, Na, and K each represent the molar-basis amount of the respective element.)

Description

technical field [0001] The present invention relates to a ferrite sintered magnet and an engine including the ferrite sintered magnet. Background technique [0002] Ba ferrite, Sr ferrite, and Ca ferrite having a hexagonal crystal structure are known as magnetic materials used for ferrite sintered magnets. In recent years, magnetoplumbite-type (M-type) Sr ferrite has been mainly used as a magnet material for engines and the like among these. M-type ferrite, for example by the general formula AFe 12 o 19 To represent. Sr ferrite has Sr at the A site of the crystal structure. [0003] In order to improve the magnetic properties of ferrite sintered magnets, attempts have been made to improve the magnetic properties by substituting a part of the A-site element and the B-site element with a rare earth element such as La and Co, respectively. For example, Patent Document 1 discloses a technique of increasing remanence (Br) and coercive force (HcJ) by substituting a part of A ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/11C04B35/26
CPCC04B2235/728C04B35/26C04B35/6262C04B35/2641C04B35/2633C04B2235/3201C04B2235/785C04B2235/788C04B2235/5409C04B2235/72C04B2235/3418H01F1/11C04B2235/5445C04B2235/5436C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/767C04B2235/782C04B2235/80H02K1/02H01F1/0315
Inventor 田口仁
Owner TDK CORPARATION