Grain boundary diffusion method of R-Fe-B rare-earth sintered magnet, HRE diffusion source and fabrication method thereof

A sintered magnet and grain boundary diffusion technology, applied in the field of magnet manufacturing, can solve the problems of inevitable loss of remanence, reduce the saturation magnetic polarization of compounds, etc., and achieve the effects of increased coercive force, efficient diffusion, and improved diffusion quality

Inactive Publication Date: 2018-04-03
XIAMEN TUNGSTEN
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  • Application Information

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Problems solved by technology

[0005] However, since the HRE pair Nd is used in mode 1) and mode 3), 2 Fe 14 The Nd in the B grain is replaced to reduce the saturation magnetic polarization of the compound. Therefore, as long as the above method is used to increase the coercive force, the loss of remanence is inevitable.

Method used

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  • Grain boundary diffusion method of R-Fe-B rare-earth sintered magnet, HRE diffusion source and fabrication method thereof
  • Grain boundary diffusion method of R-Fe-B rare-earth sintered magnet, HRE diffusion source and fabrication method thereof
  • Grain boundary diffusion method of R-Fe-B rare-earth sintered magnet, HRE diffusion source and fabrication method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Step a: Take TbF with an average particle size of 10 microns 3 Powder, add water to submerge TbF 3 The powder was put into a ball mill and ground for 5 hours to obtain ground powder.

[0062] Step b: adding cellulose to water to prepare an aqueous solution with a concentration of 1 wt% cellulose.

[0063] Step c: Press Cellulose and TbF 3 The weight ratio of the powder is 1:9, the grinding powder obtained in step a is added to the aqueous solution obtained in step b, and mixed evenly to obtain a mixed solution.

[0064] Step d: Select a W board 11 with a length and width of 10cm×10cm and a thickness of 0.5mm, put the W board 11 into an oven and heat it to 80°C, take it out, spray the above-mentioned mixture on the surface of the above-mentioned W board, and put it into the oven again to dry Dry to obtain a film-coated W plate with TbF attached to the film 3 powder.

[0065] Repeat the operation of step d on the other side of the film-coated W board to obtain a film...

Embodiment 11～ Embodiment 16

[0069] A rare earth magnet sintered body is prepared, the sintered body has the following atomic composition: Nd is 14.7, Co is 1, B is 6.5, Cu is 0.4, Mn is 0.1, Ga is 0.1, Zr is 0.1, Ti is 0.3, Fe is 0.1 quantity. It is produced according to the existing procedures of smelting, flake flakes, hydrogen crushing, jet milling, pressing, sintering and heat treatment of rare earth magnets.

[0070] The heat-treated sintered body is processed into a 15mm×15mm×30mm magnet, and the 30mm direction is the orientation direction of the magnetic field. The processed magnet is sandblasted and purged to clean the surface. The magnet uses the NIM-10000H large rare earth permanent magnet nondestructive testing system of the China Metrology Institute for magnetic performance testing. The measurement temperature is 20°C, and the measurement results are Br: 13.45kGs, Hcj: 19.00kOe, (BH)max: 42.41MGOe, SQ : 98.8%, the standard deviation value of Hcj is 0.1.

[0071] Such as figure 2 As shown ...

Embodiment 2

[0088] Step a: Take Dy with an average particle size of 20 microns 2 o 3 Powder, add absolute ethanol until Dy is submerged 2 o 3 powder, put into a ball mill and grind for 25 hours to obtain ground powder.

[0089] Step b: add resin in absolute ethanol, and configure an absolute ethanol solution with a concentration of 20 wt% resin;

[0090] Step c: Press Resin and Dy 2 o 3 The powder is in a weight ratio of 0.07:1. Add the grinding powder obtained in step a to the absolute ethanol solution obtained in step b, and mix evenly to obtain a mixed solution.

[0091] Step d: Select a zirconia plate 21 with a length and width of 10cm×10cm and a thickness of 0.5mm, put the zirconia plate 21 into an oven and heat it to 120°C, take it out, spray the above mixed solution evenly on the surface of the zirconia plate, and place it again Dry in an oven to obtain a film-coated zirconia plate, with Dy attached to the film 22 2 o 3 powder.

[0092] Repeat the operation of step d on the ...

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Abstract

The invention discloses a grain boundary diffusion method of an R-Fe-B rare-earth sintered magnet, an HRE diffusion source and a fabrication method thereof. The grain boundary diffusion method comprises the following steps of forming film engineering A on a high-temperature resistant carrier, wherein HRE compound powder is attached onto the film, and the HRE is selected from at least one of Dy, Tb, Gd and Ho; and placing the R-Fe-B rare-earth sintered magnet and the high-temperature resistant carrier processed by the engineering A in a processing room, performing thermal treatment on the R-Fe-B rare-earth sintered magnet and the high-temperature resistant carrier in vacuum or inert atmosphere, and supplying HRE engineering B to a surface of the R-Fe-B rare-earth sintered magnet from the high-temperature resistant carrier. By the method, consumption of a heavy rare-earth element can be reduced, and the loss of residual magnetism Br of the magnet is controlled as well as the coercivity is improved.

Description

technical field [0001] The invention relates to the technical field of magnet manufacture, in particular to a grain boundary diffusion method of R-Fe-B series rare earth sintered magnets. Background technique [0002] Coercive force (Hcj) is the most important technical parameter of rare earth sintered magnets (such as Nd-Fe-B series sintered magnets, etc.), which improves the anti-demagnetization ability of magnets during use. In the traditional way, the coercive force of the Nd-Fe-B magnet is mainly improved by the following methods: 1) adding heavy rare earth elements (hereinafter referred to as HRE, or It is called HREE or Heavy Rare Earth or Heavy Rare Earth Elements); 2) Adding trace elements optimizes the grain boundary structure and refines the particles, but it will cause the content of the non-magnetic phase of the magnet and Br to decrease; 3) For Nd-Fe-B Department of magnets for HRE grain boundary diffusion treatment. Mode 1) and Mode 3) both use HRE to replac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02
CPCH01F41/0293H01F1/0577H01F1/0575
Inventor 林玉麟永田浩廖宗博谢菊华叶瀚棽
Owner XIAMEN TUNGSTEN
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