公开(公告)号：US10658094B2

公开(公告)日：2020-05-19

申请号：US15389568

申请日：2016-12-23

Applicant: SHENYANG GENERAL MAGNETIC CO., LTD.

Inventor： Baoyu Sun ,  Yongli Duan

IPC: H01F1/057 ,  H01F41/02 ,  B22F3/16 ,  B22F9/04 ,  C22C38/16 ,  C22C38/14 ,  C22C38/10 ,  C22C38/06 ,  C22C38/00 ,  C22C33/04 ,  B22F3/10 ,  C21D8/12 ,  C21D9/00

Abstract: A NdFeB magnet containing cerium and a manufacturing method thereof are provided. The manufacturing method includes steps of: refining a part of raw materials pure iron, ferro-boron, and rare earth fluoride in a crucible, adding a rest of the raw materials into the crucible and refining, casting a refined solution to a surface of a water-cooled rotation roller through a tundish and forming alloy flakes, processing the alloy flakes containing at least two different compositions with hydrogen decrepitation, milling powders, magnetic field pressing, vacuum presintering, machining and sintering, and obtaining the NdFeB magnet containing cerium. The NdFeB magnet containing cerium has a density of 7.5-7.7 g/cm3 and an average particle size of 3-7 μm; comprises a main phase and a grain boundary phase distributed around the main phase. A composite phase containing Tb is provided between the main phase and the grain boundary phase.

公开(公告)号：US20170117073A1

公开(公告)日：2017-04-27

申请号：US15401262

申请日：2017-01-09

Applicant: SHENYANG GENERAL MAGNETIC CO., LTD.

Inventor： Baoyu Sun ,  Yongli Duan

IPC: H01F1/057 ,  H01F41/02

CPC classification number: H01F1/0577 ,  H01F41/0273

Abstract: A high-performance NdFeB permanent magnet produced with NdFeB scraps and a production method thereof are provided. The production method includes steps of: under a vacuum condition, sending a portion of raw materials, including pure iron, ferro-iron, the NdFeB scraps and rare earth fluorides, into a crucible, refining, and obtaining a first melting liquid; absorbing slags by a slag cleaning device, and moving the slag cleaning device out; sending a rest of raw materials into the crucible, refining the first melting liquid and the rest of raw materials in the crucible, and obtaining a second melting liquid; pouring the second melting liquid after refining onto a surface of a water-cooled rotation roller through a tundish, and forming alloy flakes; processing the alloy flakes with hydrogen decrepitation, milling the alloy flakes into powders by a jet mill, then magnetic field pressing, presintering and sintering.

公开(公告)号：US20170098496A1

公开(公告)日：2017-04-06

申请号：US15382672

申请日：2016-12-18

Applicant: SHENYANG GENERAL MAGNETIC CO., LTD.

Inventor： Baoyu Sun ,  Yongli Duan

IPC: H01F1/057 ,  C22C38/16 ,  C22C38/14 ,  C22C38/10 ,  C22C38/06 ,  C22C38/00 ,  C22C33/04 ,  B22F9/08 ,  B22F1/00 ,  B22F9/04 ,  B22F3/16 ,  B22F3/087 ,  B22F3/10 ,  C21D9/00 ,  C21D6/00 ,  H01F41/02

CPC classification number: C21D6/007 ,  B22F1/0055 ,  B22F3/101 ,  B22F3/16 ,  B22F3/162 ,  B22F2998/10 ,  B22F2999/00 ,  C21D9/00 ,  C22C33/02 ,  C22C33/04 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  C22C2202/02 ,  H01F1/0577 ,  H01F1/059 ,  H01F41/0293 ,  B22F9/08 ,  B22F2009/048 ,  B22F2009/044 ,  B22F3/02 ,  B22F3/10 ,  B22F2201/02 ,  B22F2201/20 ,  B22F2201/05

Abstract: A high-performance NdFeB permanent magnet including a nitride phase and a production method thereof are provided. A main phase of the NdFeB permanent magnet has a structure of R2T14B; a grain boundary phase is distributed around the main phase and contains N, F, Zr, Ga and Cu; a composite phase containing R1, Tb and N exists between the main phase and the grain boundary phase and includes a phase having a structure of (R1, Tb)2T14(B, N). R represents at least two rare earth elements, and includes Pr and Nd; T represents Fe, Mn, Al and Co; R1 represents at least one rare earth element, and includes at least one of Dy and Tb; the main phase contains Pr, Nd, Fe, Mn, Al, Co and B; and the grain boundary phase further contains at least one of Nb and Ti. Through placing partially B by N, a magnetic performance is increased.

公开(公告)号：US10563276B2

公开(公告)日：2020-02-18

申请号：US15382672

申请日：2016-12-18

Applicant: SHENYANG GENERAL MAGNETIC CO., LTD.

Inventor： Baoyu Sun ,  Yongli Duan

IPC: B22F3/12 ,  H01F1/057 ,  H01F41/02 ,  C21D6/00 ,  C22C38/16 ,  C22C38/14 ,  C22C38/10 ,  C22C38/06 ,  C22C38/00 ,  C22C33/04 ,  B22F3/16 ,  C21D9/00 ,  H01F1/059 ,  B22F3/10 ,  C22C33/02 ,  B22F1/00

Abstract: A high-performance NdFeB permanent magnet including a nitride phase and a production method thereof are provided. A main phase of the NdFeB permanent magnet has a structure of R2T14B; a grain boundary phase is distributed around the main phase and contains N, F, Zr, Ga and Cu; a composite phase containing R1, Tb and N exists between the main phase and the grain boundary phase and includes a phase having a structure of (R1, Tb)2T14(B, N). R represents at least two rare earth elements, and includes Pr and Nd; T represents Fe, Mn, Al and Co; R1 represents at least one rare earth element, and includes at least one of Dy and Tb; the main phase contains Pr, Nd, Fe, Mn, Al, Co and B; and the grain boundary phase further contains at least one of Nb and Ti. Through placing partially B by N, a magnetic performance is increased.

公开(公告)号：US10468167B2

公开(公告)日：2019-11-05

申请号：US15401262

申请日：2017-01-09

Applicant: SHENYANG GENERAL MAGNETIC CO., LTD.

Inventor： Baoyu Sun ,  Yongli Duan

IPC: H01F1/057 ,  H01F41/02 ,  B22F7/02

Abstract: A high-performance NdFeB permanent magnet produced with NdFeB scraps and a production method thereof are provided. The production method includes steps of: under a vacuum condition, sending a portion of raw materials, including pure iron, ferro-iron, the NdFeB scraps and rare earth fluorides, into a crucible, refining, and obtaining a first melting liquid; absorbing slags by a slag cleaning device, and moving the slag cleaning device out; sending a rest of raw materials into the crucible, refining the first melting liquid and the rest of raw materials in the crucible, and obtaining a second melting liquid; pouring the second melting liquid after refining onto a surface of a water-cooled rotation roller through a tundish, and forming alloy flakes; processing the alloy flakes with hydrogen decrepitation, milling the alloy flakes into powders by a jet mill, then magnetic field pressing, presintering and sintering.

公开(公告)号：US20170103837A1

公开(公告)日：2017-04-13

申请号：US15389568

申请日：2016-12-23

Applicant: SHENYANG GENERAL MAGNETIC CO., LTD.

Inventor： Baoyu Sun ,  Yongli Duan

IPC: H01F1/057 ,  C22C38/14 ,  C22C38/10 ,  C22C38/06 ,  C22C38/00 ,  C22C33/04 ,  C22C33/02 ,  B22F9/10 ,  B22F9/02 ,  B22F3/087 ,  B22F3/10 ,  B22F3/16 ,  B22F3/24 ,  B22F5/00 ,  C21D8/12 ,  C21D9/00 ,  H01F41/02 ,  C22C38/16

CPC classification number: H01F1/0577 ,  B22F3/1017 ,  B22F2998/10 ,  B22F2999/00 ,  C21D8/1216 ,  C21D8/1244 ,  C21D9/0068 ,  C22C33/04 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  C22C2202/02 ,  H01F41/0273 ,  B22F2009/048 ,  B22F1/0055 ,  B22F9/023 ,  B22F2009/047 ,  B22F3/087 ,  B22F3/162 ,  B22F2003/248 ,  B22F2009/044 ,  B22F2201/02 ,  B22F3/1007 ,  B22F2201/20

Abstract: A NdFeB magnet containing cerium and a manufacturing method thereof are provided. The manufacturing method includes steps of: refining a part of raw materials pure iron, ferro-boron, and rare earth fluoride in a crucible, adding a rest of the raw materials into the crucible and refining, casting a refined solution to a surface of a water-cooled rotation roller through a tundish and forming alloy flakes, processing the alloy flakes containing at least two different compositions with hydrogen decrepitation, milling powders, magnetic field pressing, vacuum presintering, machining and sintering, and obtaining the NdFeB magnet containing cerium. The NdFeB magnet containing cerium has a density of 7.5-7.7 g/cm3 and an average particle size of 3-7 μm; comprises a main phase and a grain boundary phase distributed around the main phase. A composite phase containing Tb is provided between the main phase and the grain boundary phase.