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1. 发明授权

US10026531B2 R-T-B based alloy powder, compound for anisotropic bonded magnet and anisotropic bonded magnet 有权
公开(公告)号：US10026531B2
公开(公告)日：2018-07-17
申请号：US14354702
申请日：2012-10-11
申请人： TDK CORPORATION
发明人： Nobuhiro Okuda
IPC分类号： H01F1/057 , C22C38/10 , C22C38/12 , B22F1/00 , C22C33/02 , C22C38/00 , B82Y30/00 , B22F3/22
摘要： The present invention provides R-T-B based alloy powders, wherein R represents at least one rare earth element, and T represents at least one element selected from the group consisting of ferrum and cobalt. The R-T-B based alloy powders have main phase grains, grain boundary phases and additive phases. The main phase grains are composed of R2T14B and have an average grain size of 200 nm or more and 500 nm or less. The grain boundary phases are richer in R than the main phase grains. With respect to any cross section of the R-T-B based alloy powders, the coverage of the main phase grains defined by equation 1 with the grain boundary phases with a roundness defined by equation 2 being 0.1 or more and 0.6 or less, is 10% or more and 40% or less. coverage ≡ ∑ i ⁢ ⁢ l i ∑ j ⁢ ⁢ L j ⁢ ⁢ l i ⁢ : ⁢ ⁢ Circumference ⁢ ⁢ of ⁢ ⁢ each ⁢ ⁢ grain boundary ⁢ ⁢ phase ⁢ ⁢ L j ⁢ : ⁢ ⁢ Circumference ⁢ ⁢ of ⁢ ⁢ each ⁢ ⁢ main phase ⁢ ⁢ grain 〈 equation ⁢ ⁢ 1 〉 Roundness = 4 ⁢ ⁢ π ⁢ ⁢ A ⁢ / ⁢ L 2 〈 equation ⁢ ⁢ 2 〉 A represents the area of the cross section of the grain boundary phase, and L represents the circumference of the cross section of the grain boundary phase.

2. 发明授权

US11410806B2 Magnetic core and coil component 有权
公开(公告)号：US11410806B2
公开(公告)日：2022-08-09
申请号：US16823394
申请日：2020-03-19
申请人： TDK CORPORATION
发明人： Nobuhiro Okuda , Hiroyuki Matsumoto , Kazuhiro Yoshidome
IPC分类号： H01F27/24 , H01F1/20 , H01F3/08 , H01F27/28
摘要： The present invention relates to a magnetic core containing soft magnetic powder and a coil component using the magnetic core. The soft magnetic powder has particles each having at least one pore therein, and the number of pores present in a region of 2.5 mm square in a cross section of the magnetic core is 60×(η/80) or more and 10000×(η/80) or less, in which the volume packing density of the soft magnetic powder in the magnetic core is η%.

3. 发明申请

US20140341774A1 R-T-B BASED ALLOY POWDER, COMPOUND FOR ANISOTROPIC BONDED MAGNET AND ANISOTROPIC BONDED MAGNET 有权
标题翻译：基于R-T-B的合金粉末，用于各向异性粘结磁体和各向异性粘结磁体的化合物
公开(公告)号：US20140341774A1
公开(公告)日：2014-11-20
申请号：US14354702
申请日：2012-10-11
申请人： TDK CORPORATION
发明人： Nobuhiro Okuda
IPC分类号： H01F1/057
CPC分类号： H01F1/0571 , B22F1/0018 , B22F3/225 , B82Y30/00 , C22C33/0278 , C22C38/001 , C22C38/005 , C22C38/10 , C22C38/12 , H01F1/0578
摘要： The present invention provides R-T-B based alloy powders, wherein R represents at least one rare earth element, and T represents at least one element selected from the group consisting of ferrum and cobalt. The R-T-B based alloy powders have main phase grains, grain boundary phases and additive phases. The main phase grains are composed of R2T14B and have an average grain size of 200 nm or more and 500 nm or less. The grain boundary phases are richer in R than the main phase grains. With respect to any cross section of the R-T-B based alloy powders, the coverage of the main phase grains defined by equation 1 with the grain boundary phases with a roundness defined by equation 2 being 0.1 or more and 0.6 or less, is 10% or more and 40% or less. coverage ≡ ∑ i   l i ∑ j   L j   l i  :   Circumference   of   each   grain boundary   phase   L j  :   Circumference   of   each   main phase   grain 〈 equation   1 〉 Roundness = 4   π   A  /  L 2 〈 equation   2 〉 A represents the area of the cross section of the grain boundary phase, and L represents the circumference of the cross section of the grain boundary phase.
摘要翻译：本发明提供R-T-B系合金粉末，其中，R表示至少一种稀土元素，T表示选自铁和钴中的至少一种元素。 R-T-B系合金粉末具有主相晶粒，晶界相和添加相。主相晶粒由R2T14B组成，平均粒径为200nm以上且500nm以下。晶界相R比主相晶粒更丰富。对于RTB合金粉末的任何横截面，由等式1定义的具有等式2所定义的圆度的晶界相为0.1以上且0.6以下的主相晶粒的覆盖率为10％以上和40％以下。覆盖范围≡ΣliΣΣ 主要相位晶粒<方程1>圆度= 4研究＆ A表示晶界相的截面面积，L表示晶界相的截面的周长。

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