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Method for producing r-t-b sintered magnet

A technology of sintered magnets and manufacturing methods, applied in the direction of inductance/transformer/magnet manufacturing, manufacturing tools, magnetic objects, etc., can solve the problems of heavy processing load, long processing time, unavoidable, etc., and achieve manufacturing cost and mass production excellent effect

Pending Publication Date: 2022-04-12
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the sintered body of rare earth alloy magnets such as R-Fe-B based sintered magnets is extremely hard and brittle, and the processing load is large, so high-precision grinding is difficult and takes a long time.
In addition, the inevitable loss of material parts due to processing
Therefore, the processing steps become the main cause of the increase in manufacturing cost

Method used

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  • Method for producing r-t-b sintered magnet
  • Method for producing r-t-b sintered magnet
  • Method for producing r-t-b sintered magnet

Examples

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Embodiment Construction

[0039] Hereinafter, an embodiment of the method for producing the R-TB based sintered magnet of the present invention will be described. Such as figure 1 As shown in the flow chart of the present embodiment, the manufacturing method of the R-TB system sintered magnet includes:

[0040] Prepare an alloy for R-T-B system sintered magnets (R is a rare earth element and must contain at least one selected from Nd, Pr and Ce, T is at least one transition metal and must contain Fe, and B is boron) The pulverizing process (S10) of the powder;

[0041] A forming process (S20) of producing a powder compact using powder;

[0042] Cutting the powder compact and dividing it into a plurality of compact pieces (S30);

[0043] sintering each of the plurality of molded body sheets to produce a plurality of sintered bodies (S40),

[0044] The cutting process ( S30 ) includes a step of cutting the above-mentioned powder compact immersed in the liquid by a traveling metal wire.

[0045] Acco...

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Abstract

Provided is a method for producing an R-T-B sintered magnet, which does not require the preparation of an inert atmosphere. This method for producing an R-T-B sintered magnet comprises: a pulverization step for preparing a powder of an alloy for an R-T-B sintered magnet; a molding step for producing a powder molded body using the powder; a cutting step in which the powder molded body is cut and divided into a plurality of molded body pieces; and a sintering step in which each of the plurality of molded body sheets is sintered to produce a plurality of sintered bodies. The cutting step includes a step in which the powder molded body immersed in the liquid is cut by a traveling metal wire.

Description

technical field [0001] The invention relates to a method for manufacturing an R-TB system sintered magnet. Background technique [0002] R-T-B system sintered magnet (R is a rare earth element, must contain at least one selected from Nd, Pr and Ce, T is at least one transition metal, must contain Fe, B is boron) with R 2 Fe 14 The main phase of the compound of type B crystal structure, the grain boundary phase located in the grain boundary part of this main phase, and the compound phase produced|generated by the influence of a trace addition element or impurity are comprised. R-T-B system sintered magnet exhibits high residual magnetic flux density B r (Hereinafter, sometimes only described as "B r ”) and high coercive force H cJ (Hereinafter, sometimes only described as "H cJ ”), and has excellent magnetic properties, so it is known as the magnet with the highest performance among permanent magnets. Therefore, R-TB-based sintered magnets are used in voice coil motors (...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057B23D57/00
CPCY02T10/64
Inventor 村田刚志
Owner HITACHI METALS LTD
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