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Manufacturing method of R-T-B series sintered magnet

A technology of sintered magnets and manufacturing methods, which can be applied in the manufacture of inductors/transformers/magnets, magnetic objects, and manufacture of motor generators, etc., and can solve problems such as easy demagnetization

Pending Publication Date: 2020-10-09
株式会社博迈立铖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

h k / H cJ When low, it causes the problem of easy demagnetization

Method used

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  • Manufacturing method of R-T-B series sintered magnet
  • Manufacturing method of R-T-B series sintered magnet
  • Manufacturing method of R-T-B series sintered magnet

Examples

Experimental program
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Embodiment

[0112] Each element was weighed so that the RTB-based sintered magnets had approximately the compositions shown in alloy Nos. M1 to M6 in Table 1, and cast by a strip casting method to obtain flaky alloys. The obtained flaky alloy was subjected to hydrogen embrittlement in a pressurized hydrogen atmosphere, and then subjected to a dehydrogenation treatment in which it was heated to 550° C. in a vacuum and then cooled to obtain a coarsely pulverized powder. Next, 0.04% by mass of zinc stearate was added as a lubricant to 100% by mass of the coarsely pulverized powder as a lubricant, and after mixing, it was mixed with a jet mill (jet mill) in a nitrogen atmosphere. Dry pulverization in the atmosphere to obtain D 50 3.8 ~ 4.0μm alloy powder. The results of component analysis of the obtained alloy powders are shown in Alloy Nos. M1 to M6 in Table 1. Each component (except O, N, and C) in Table 1 was measured by high-frequency inductively coupled plasma optical emission spectrom...

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Abstract

The present invention provides a method for manufacturing R-T-B series sintered magnets with high HcJ and high Hk / HcJ that hardly use RH (specifically, the RH content being 0.5% by mass or below). Asa solution, the method for manufacturing a R-T-B series sintered magnet, which comprises 29.3% (inclusive) to 35.0% (inclusive) by mass of R, 0.80% (inclusive) to 0.91% (inclusive) by mass of B, 0.2%(inclusive) to 1.0% (inclusive) by mass of Ga, and 61.5% (inclusive) to 69.5% (inclusive) by mass of T, and satisfies a formula (1) that is [T] / 55.85 >14[B] / 10.8, includes a step of preparing alloy powder, a forming step, a sintering step and a heat treatment step.

Description

technical field [0001] The invention relates to a method for manufacturing an R-TB system sintered magnet. Background technique [0002] R-T-B sintered magnets (R is at least one of the rare earth elements and contains at least one of Nd and Pr, T is at least one of the transition metal elements and contains Fe) is known to be the highest permanent magnet. High-performance magnets are used in various motors such as voice coil motors (VCM) for hard disk drives, motors for electric vehicles (EV, HV, PHV, etc.), motors for industrial machinery, and home appliances. [0003] R-T-B system sintered magnets mainly contain R 2 T 14 The main phase of the B compound and the grain boundary phase located in the grain boundary portion of the main phase are constituted. R as main phase 2 T 14 B compound is a ferromagnetic material with high magnetization, which is the foundation of the characteristics of R-TB system sintered magnets. [0004] Coercive force H of R-T-B sintered magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02H02K1/02H02K15/03
CPCH01F1/0577H01F41/0253H02K1/02H02K15/03Y02T10/64
Inventor 藤森信彦
Owner 株式会社博迈立铖
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