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Ferrite pre-sintered body and method for producing same

A manufacturing method, ferrite technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of not being disclosed, and achieve the effect of reducing the amount of use

Pending Publication Date: 2022-03-29
株式会社博迈立铖
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The CaLaCo magnet in Patent Document 1 contains Co at an atomic ratio of about 0.3, although it has a high B r and H cJ , but about H k / H cJ of data is not publicly available at all

Method used

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  • Ferrite pre-sintered body and method for producing same

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experiment example 1

[0106] As an experimental example based on the embodiment of the present invention, in the general formula Ca 1－x－y La x SryFe 2n－z co z , weigh CaCO at the specified composition 3 Powder, La(OH) 3 Powder, SrCO 3 Powder, Fe 2 o 3 Powder and Co 3 o 4 powder so that the atomic ratio becomes 1-x-y, x, y, z, and 2n-z shown in Sample Nos. 1 to 15 in Table 1, and 0.1 mass %H 3 BO 3 After powdering, the powders were mixed with a wet ball mill for 4 hours, and then dried to adjust the particle size to obtain 6 kinds of mixed raw material powders. The obtained mixed raw material powders were calcined in the air at 1200°C for 3 hours, respectively, to obtain six types of calcined bodies.

[0107] Each of the obtained calcined bodies was roughly pulverized with a small grinder to obtain six kinds of roughly pulverized powders of the calcined bodies. With respect to 100% by mass of the coarsely pulverized powder of each calcined body obtained, CaCO shown in Table 1 was added....

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Abstract

Provided is a ferrite sintered magnet which has magnet characteristics satisfying all of high Br, high HcJ, and high Hk / HcJ, and in which the amount of Co used is reduced as compared to a conventional CaLaCo magnet. A ferrite pre-sintered body according to the present invention is characterized in that in the general formula of the atomic ratio of a metal element (where R is at least one rare earth element and essentially contains La) of Ca, R, Sr, Fe, and Co: Ca1-x-yRxAyFe2n-zCoz, x, y, z, and n (where 2n is a molar ratio and is represented by 2n = (Fe + Co) / (Ca + R + Sr)) satisfy 0.4 < = x < 0.5, 0 < y < = 0.2, 0.18 < z < 0.3, 1.6 < = x / z < = 2.25, and 8.5 < = 2n-z < = 10.

Description

technical field [0001] The present invention relates to ferrite calcined body and its manufacturing method. Background technique [0002] The maximum energy product of ferrite sintered magnets is only 1 / 10 of that of rare earth sintered magnets (such as NdFeB sintered magnets), but since the main raw material is cheap iron oxide, it has excellent cost performance and is extremely chemically stable. Therefore, it is used in various applications such as various motors and speakers, and the world's production weight is still the largest among magnet materials. [0003] A representative ferrite sintered magnet is Sr ferrite with a magnetoplumbite structure, and its basic composition is composed of SrFe 12 o 19 express. In the second half of the 1990s, SrFe 12 o 19 Sr 2+ part of La 3+ Replacement, the Fe 3+ part of Co 2+ Substituted Sr—La—Co based ferrite sintered magnets (hereinafter, sometimes simply referred to as “SrLaCo magnets”) have been put into practical use, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622H01F1/11H01F41/02
CPCC04B35/2633C04B35/622H01F1/11H01F41/0266C04B2235/3208C04B2235/3227C04B2235/3213C04B2235/3272C04B2235/3275C04B2235/3409C04B2235/5445C04B2235/602C04B2235/605C04B2235/656C04B2235/6562C04B2235/6567C04B2235/6583C04B2235/6565H01F1/053C04B35/26
Inventor 小林义德
Owner 株式会社博迈立铖