METHOD OF PRODUCING R-T-B SINTERED MAGNET

Title:

METHOD OF PRODUCING R-T-B SINTERED MAGNET

Document Type and Number:

WIPO Patent Application WO/2015/030231

Kind Code:

A1

Abstract:

　A method of producing a magnet including a step of preparing a magnet represented by the formula uRwBxGayCuzAlqM (balance: T), in which the RH is 5% or less, 0.20≦x0.70, 0.07≦y≦0.2, 0.05≦z≦0.5, and 0≦q≦0.1; when 0.40≦x≦0.70, v and w are such that 50w-18.5≦v≦50-14, and -12.5w+38.75≦v≦-62.5w+86.125; and when 0.20≦x<0.40, v and w are such that 50w‒18.5≦v≦50w‒15.5 and ‒12.5w+39.125≦v≦‒62.5w+86.125, and x is such that ‒(62.5w+v‒81.625)/15+0.5≦x≦‒(62.5w+‒81.625)/15+0.8; a high-temperature heat treatment step of heating the magnet to 730 to 1020°C, and then cooling the magnet to 300°C at 20°C/min or more; and a low-temperature heat treatment step of heating the magnet to 440 to 550°C.

Inventors:

YAMAGATA RYOUICHI (JP)
ISHII RINTARO (JP)
KUNIYOSHI FUTOSHI (JP)
SATOH TEPPEI (JP)

Application Number:

PCT/JP2014/072920

Publication Date:

March 05, 2015

Filing Date:

September 01, 2014

Export Citation:

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Assignee:

HITACHI METALS LTD (JP)

International Classes:

H01F41/02; B22F3/00; B22F3/24; C21D6/00; C22C33/02; C22C38/00; H01F1/057; H01F1/08

Domestic Patent References:

WO2012161355A1	2012-11-29
WO2013008756A1	2013-01-17

Foreign References:

JP2006237168A	2006-09-07
JP2011216678A	2011-10-27
JP2001210508A	2001-08-03
JP2003510467A	2003-03-18

Other References: