基本信息:
- 专利标题： SINTERED NEODYMIUM MAGNET
- 专利标题（中）：烧结的NEODYMIUM磁体
- 申请号：EP12863318.7 申请日：2012-12-27
- 公开(公告)号：EP2800108B1 公开(公告)日：2018-04-11
- 发明人： SAGAWA, Masato , MIZOGUCHI, Tetsuhiko
- 申请人： INTERMETALLICS CO., LTD.
- 申请人地址： 1642-144, Nasubigawa, Nakatsugawa-shi, Gifu 509-9132 JP
- 专利权人： INTERMETALLICS CO., LTD.
- 当前专利权人： DAIDO STEEL CO., LTD., NAGOYA-SHI, JP
- 当前专利权人地址： DAIDO STEEL CO., LTD., NAGOYA-SHI, JP
- 代理机构： Hoeger, Stellrecht & Partner Patentanwälte mbB
- 优先权： JP2011286864 20111227; JP2012026719 20120209
- 国际公布： WO2013100010 20130704
- 主分类号： H01F1/08
- IPC分类号： H01F1/08 ; B22F1/00 ; B22F3/00 ; C22C33/02 ; H01F1/057 ; H01F41/02
摘要：
Provided is a NdFeB system sintered magnet which is produced by the grain boundary diffusion method and yet has a high coercive force and squareness ratio with only a small decrease in the maximum energy product. A NdFeB system sintered magnet according to the present invention is a NdFeB system sintered magnet having a base material produced by orienting powder of a NdFeB system alloy and sintering the powder, with Dy and/or Tb (the "Dy and/or Tb" is hereinafter called R H ) attached to and diffused from a surface of the base material through the grain boundary inside the base material by a grain boundary diffusion treatment, wherein the difference C s -C d3 between the R H content C s (wt%) in the grain boundary reaching the surface to which R H is attached and the R H content C d3 (wt%) in the grain boundary at a depth of 3 mm from the aforementioned attachment surface is equal to or smaller than 20 wt%.
公开/授权文献:
- EP2800108A1 SINTERED NEODYMIUM MAGNET 公开/授权日：2014-11-05
IPC结构图谱:
| H | 电学 |
| --H01 | 基本电气元件 |
| ----H01F | 磁体；电感；变压器；磁性材料的选择 |
| ------H01F1/00 | 按所用磁性材料区分的磁体或磁性物体；磁性材料的选择 |
| --------H01F1/01 | .无机材料的 |
| ----------H01F1/03 | ..按其矫顽力区分的 |
| ------------H01F1/032 | ...硬磁材料的 |
| --------------H01F1/04 | ....金属或合金 |
| ----------------H01F1/047 | .....按其成分区分的合金 |
| ------------------H01F1/08 | ......压制的、烧结的或黏结在一起的 |