Rare earth sintered magnet

A technology of sintered magnets and rare earths, which is applied in the directions of magnetic objects, magnetic materials, transportation and packaging, etc. It can solve problems such as difficult application of grain boundary diffusion method and achieve excellent magnetic properties

Pending Publication Date: 2022-07-12
SHIN ETSU CHEM IND CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] However, in the case of miniaturization above a certain level, the concentration of impurities (mainly oxygen and nitrogen) in the fine powder increases due to the decrease in the pulverization ability during fine pulverization and the increase in the reactivity of the fine powder, so the H of the Nd magnet cJ reduce, or even if H cJ It is also difficult to apply the grain boundary diffusion method described later

Method used

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Embodiment 1～3

[0070] Nd metal, Pr metal, Dy metal, boron-iron alloy, electrolytic Co, Al metal, Cu metal, Ga metal, Si metal, zirconium metal, and electrolytic iron (all metals with a purity of 99% or more) are called in a predetermined ratio. Quantity and blending, melting, and casting by the strip casting method were performed to obtain a flake-shaped raw material alloy with a thickness of 0.2 to 0.4 mm. The obtained flake-shaped raw material alloy was subjected to hydrogen embrittlement in a hydrogen pressurized atmosphere to obtain a coarsely pulverized powder. Next, to the obtained coarsely pulverized powder, stearic acid as a lubricant was added and mixed in a ratio shown in Table 1 with respect to 100 mass % of the coarsely pulverized powder, and then, using a jet mill (jet mill), nitrogen Dry pulverization was carried out in the stream to obtain the pulverized particle size (D) shown in Table 1. 50 ) of the finely pulverized powder (alloy powder). It should be noted that the pulve...

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Abstract

Provided is a rare earth sintered magnet characterized by containing R (R is one or more elements selected from rare earth elements, where Nd is essential), T (T is one or more elements selected from iron group elements, where Fe is essential), X (X is one or two elements selected from B and C, where B is essential), M1 (M1 is one or more elements selected from Al, Si, Cr, Mn, Cu, Zn, Ga, Ge, Mo, Sn, W, Pb, and Bi), 0.1 mass% or less of O, 0.05 mass% or less of N, 0.07 mass% or less of C, and an average crystal grain size of 4.0 [mu] m or less. If the degree of orientation is Or [%] and the average crystal grain size is D [[mu] m], relational expression (1): 0.26 * D + 97 < = Or < = 0.26 * D + 99 is satisfied. According to this rare earth sintered magnet, excellent magnetic properties of both high Br and high HcJ can be obtained.

Description

technical field [0001] The present invention relates to having both high Br and high H cJ A rare earth sintered magnet with excellent magnetic properties and a method for producing the same. Background technique [0002] Rare earth sintered magnet is an indispensable functional material for energy saving and high functionalization, and its application range and production volume are expanding year by year. Among rare earth sintered magnets, in particular, Nd-based sintered magnets (hereinafter referred to as "Nd magnets") have a high residual magnetic flux density (hereinafter referred to as "Br"), and are used, for example, in drive motors for hybrid vehicles and electric vehicles , Electric power steering motors, compressor motors for air conditioners, voice coil motors (VCM) for hard disk drives, etc. As described above, Nd magnets having high Br are used in motors for various applications, but for example, in order to further miniaturize the motor, higher Br is require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057C22C38/00B22F3/00
CPCB22F2009/044B22F2009/048B22F2998/10C22C33/0278B22F1/05B22F2999/00H01F1/0577H01F41/0293Y02T10/64C22C38/005C22C38/10C22C38/16C22C38/06C22C38/02C22C38/14C22C38/002C22C38/001B22F2201/10B22F3/02B22F2202/05B22F3/10B22F2201/20B22F9/023B22F2003/248H01F1/058
Inventor 久米哲也榊一晃
Owner SHIN ETSU CHEM IND CO LTD
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