公开(公告)号：US20090032147A1

公开(公告)日：2009-02-05

申请号：US12254967

申请日：2008-10-21

申请人： Noriyuki NOZAWA ,  Takeshi NISHIUCHI ,  Satoshi HIROSAWA ,  Tomohito MAKI

发明人： Noriyuki NOZAWA ,  Takeshi NISHIUCHI ,  Satoshi HIROSAWA ,  Tomohito MAKI

IPC分类号： H01F1/08 ,  C22C1/04 ,  B22F3/11 ,  B22F3/12

CPC分类号： H01F41/0273 ,  B22F3/11 ,  B22F2003/248 ,  B22F2998/10 ,  C22C38/005 ,  C22C2202/02 ,  H01F1/0573 ,  H01F1/0576 ,  H01F1/0577 ,  H01F1/0578 ,  H01F41/0293 ,  B22F3/02 ,  B22F3/24

摘要： An R—Fe—B based rare-earth alloy powder with a mean particle size of less than about 20 μm is provided and compacted to make a powder compact. Next, the powder compact is subjected to a heat treatment at a temperature of about 550° C. to less than about 1,000° C. within hydrogen gas, thereby producing hydrogenation and disproportionation reactions (HD processes). Then, the powder compact is subjected to another heat treatment at a temperature of about 550° C. to less than about 1,000° C. within either a vacuum or an inert atmosphere, thereby producing desorption and recombination reactions and obtaining a porous material including fine crystal grains, of which the density is about 60% to about 90% of their true density and which have an average crystal grain size of about 0.01 μm to about 2 μm (DR processes). Thereafter, the porous material is subjected to yet another heat treatment at a temperature of about 750° C. to less than about 1,000° C. within either the vacuum or the inert atmosphere, thereby further increasing its density to about 93% or more of their true density and making an R—Fe—B based microcrystalline high-density magnet.

摘要翻译： 提供平均粒径小于约20μm的R-Fe-B系稀土合金粉末并压实成粉末压块。 接着，在氢气中，在约550℃至小于约1000℃的温度下对粉体进行热处理，由此进行氢化和歧化反应（HD工艺）。 然后，在真空或惰性气氛中，将粉末压块在约550℃至小于约1000℃的温度下进行另外的热处理，从而产生解吸和重组反应，并获得包括精细的多孔材料 晶粒，其密度为其真实密度的约60％至约90％，并且其平均晶粒尺寸为约0.01μm至约2μm（DR工艺）。 此后，多孔材料在真空或惰性气氛中在约750℃至小于约1000℃的温度下进行另外的热处理，从而进一步将其密度提高到约93％以上 它们的真实密度并制成R-Fe-B基微晶高密度磁体。

公开(公告)号：US20120306308A1

公开(公告)日：2012-12-06

申请号：US13586917

申请日：2012-08-16

申请人： Takeshi NISHIUCHI ,  Noriyuki NOZAWA ,  Satoshi HIROSAWA ,  Tomohito MAKI ,  Katsunori BEKKI

发明人： Takeshi NISHIUCHI ,  Noriyuki NOZAWA ,  Satoshi HIROSAWA ,  Tomohito MAKI ,  Katsunori BEKKI

IPC分类号： H02K21/12 ,  H01F7/02 ,  B22F7/02 ,  B05D5/00 ,  B22F3/26

CPC分类号： H01F1/057 ,  H01F1/0573 ,  H01F1/0576 ,  H01F1/0578 ,  H01F1/0579 ,  H01F41/028 ,  Y10T428/12153

摘要： An R—Fe—B based porous magnet according to the present invention has an aggregate structure of Nd2Fe14B type crystalline phases with an average grain size of 0.1 μm to 1 μm. At least a portion of the magnet is porous and has micropores with a major axis of 1 μm to 20 μm.

摘要翻译： 根据本发明的R-Fe-B系多孔磁体具有平均粒径为0.1μm〜1μm的Nd2Fe14B型结晶相的集合体。 磁体的至少一部分是多孔的并且具有长轴为1μm至20μm的微孔。