WO/2005/095024 is referenced by 3 patents.

(EN) A process for producing an alloy slab for rare-earth sintered magnet, in which homogenization of R-rich region and 2-14-1 phase dendrite spacings, sizes, orientations, shapes, etc. can be attained with the generation of chill crystal suppressed, which alloy slab facilitates pulverization into uniform particle size in the step of pulverization for production of rare-earth sintered magnet and enables control of contraction ratio of an alloy powder compact after the pulverization; an alloy slab for rare-earth sintered magnet produced by the process; and a rare-earth sintered magnet excelling in magnetic properties. There is provided a process comprising the step of preparing a melt of alloy composed of R such as a rare earth metal element, B and Fe together with the balance of M and the step of feeding the alloy melt to cooling rolls with surfaces having multiple linear solidification nucleus generation inhibiting parts capable of inhibiting the generation of dendrite, etc. and solidification nucleus generating parts capable of generation of dendrite wherein the line width of solidification nucleus generation inhibiting parts has a region of > 100 μm, thereby effecting cooling solidification.(JA)  本発明は、R-rich領域及び2-14-1相のデンドライトの間隔、大きさ、配向性、形状等を均質化でき、チル晶の生成が抑制され、希土類焼結磁石を調製する際の粉砕工程において、均一粒度への粉砕が容易で、粉砕後の合金粉末成形体の縮率制御が可能な希土類焼結磁石用合金鋳片の製造法、該方法で得られる希土類焼結磁石用合金鋳片及び磁気特性に優れる希土類焼結磁石を提供する。本発明の製造法は、希土類金属元素等のR、B及びFeを含む残部Mからなる組成の合金溶湯を準備する工程と、ロール表面に、デンドライト等の生成を抑制する線状の凝固核生成抑制部と、デンドライトを生成させる凝固核生成部とを各々複数有し、且つ凝固核生成抑制部の線幅が100μmより大きい領域を有する冷却ロールに前記合金溶湯を供給して冷却凝固させる工程とを含む。

Title
(Ja) 希土類焼結磁石用合金鋳片の製造法、希土類焼結磁石用合金鋳片及び希土類焼結磁石
(En) Process for producing alloy slab for rare-earth sintered magnet, alloy slab for rare-earth sintered magnet and rare-earth sintered magnet
Application Number
PCT/JP2005/006278
Publication Number
2005/095024
Application Date
March 31, 2005
Publication Date
October 13, 2005
Inventor
Yamamoto Kazuhiko
Murakami Ryo
Shintani Kazumasa
Agent
SAKAI Hajime
Assignee
Yamamoto Kazuhiko
Murakami Ryo
Shintani Kazumasa
Santoku Corporation
IPC
H01F 01/08
H01F 01/053
C22C 38/00
C22C 33/02
B22F 09/04
B22F 03/00
B22D 11/106
B22D 11/06
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