CN1014688B - Process for preparing nd-fe-b spherical non-crystalline microcrystalline powder - Google Patents
Process for preparing nd-fe-b spherical non-crystalline microcrystalline powderInfo
- Publication number
- CN1014688B CN1014688B CN 88108934 CN88108934A CN1014688B CN 1014688 B CN1014688 B CN 1014688B CN 88108934 CN88108934 CN 88108934 CN 88108934 A CN88108934 A CN 88108934A CN 1014688 B CN1014688 B CN 1014688B
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- Prior art keywords
- crystalline
- spherical non
- powder
- micro
- preparing
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Abstract
The present invention relates to a method for preparing Nd-Fe-B spherical non-crystalline and micro-crystalline powder, which belongs to the preparation of magnetic functional materials. The present invention is used for preparing spherical non-crystalline and micro-crystalline powder for bonding Nd-Fe-B permanent magnetic materials through composite atomizing technology. The bonding Nd-Fe-B permanent magnetic materials comprise the following components (weight): 10 to 70% of Nd, 0.1 to 10% of B and balancing Fe. Nitrogen gas or argon gas at the speed of 1.1 to 6 Mach numbers are used for impacting and crushing alloy liquid flow, and then a metal circular disc at the rotation speed of 300 to 16, 000 revolutions/ minute is used for processing to manufacture the Nd-Fe-B spherical non-crystalline and micro-crystalline powder. The performance of the powder can reach (BH) max=7.0-20 MGOe, and the Nd-Fe-B spherical non-crystalline and micro-crystalline powder has isotropy.
Description
The invention belongs to the preparation of magnetic functional material, especially the present invention relates to a kind of preparation method of novel Nd-Fe-B spherical non-crystalline microcrystalline powder.
Nd-Fe-B spherical non-crystalline microcrystalline powder is mainly used in the manufacturing bonding rare earth permanent magnet material.The used neodymium iron boron powder of bonding rare earth permanent magnet material adopts U.S. GM company proposition foundry alloy is melted then to get rid of the band method with single roller chilling more at present, make the thick amorphous thin ribbon of 20～30 μ m earlier again through mechanical crushing method, produce the neodymium iron boron non-crystalline microcrystalline powder of sheet.Because powder particle is shaped as the fragment shape, and performance is very crisp, when producing binding electromagnetic material, causes the grain shape segregation easily.Volumetric efficiency is low, and the fragment breakage problem, causes the performance of binding electromagnetic material inhomogeneous, easily causes binding electromagnetic material easily to peel off and problems such as surface smoothness is low in machining process simultaneously.
The purpose of this invention is to provide a kind of novel preparation method, with the preparation Nd-Fe-B spherical non-crystalline microcrystalline powder, thereby the uniformity and the surface smoothness of the magnetic property of the binding electromagnetic material that raising is produced are improved processing characteristics.
The technical solution adopted in the present invention is: carry out spray atomization and carry out the compound atomization that centrifugal atomizing combines with the centrifugal pan of high speed rotating with high pressure nitrogen or argon gas, it is characterized in that: melting or remelting foundry alloy, its composition is (weight ratio): Nd23～40%, B0.3～3.8%, Yu Weitie; With pressure is 150 kilograms per centimeter
2, flow velocity is that the nitrogen or the argon gas of 3.8 Mach numbers carries out spray atomization; Be that 12000 rev/mins metal garden dish carries out centrifugal atomizing with rotating speed again, thereby make Nd-Fe-B spherical non-crystalline microcrystalline powder.
Fig. 1 is an equipment schematic diagram of realizing the compound atomizing spherical powder of the inventive method.
Preparation method below in conjunction with the spherical non-crystalline microcrystalline powder of 1 pair of neodymium iron boron of accompanying drawing is elaborated.
At first, with traditional method melting or remelting foundry alloy under vacuum or argon shield, its composition is (weight ratio): Nd23～40%, B0.3～3.8%, Yu Weitie.
Subsequently, with the foundry alloy injection top bottom pour ladle of fusion, alloy liquation (the liquid temperature control is about 1350 ℃), the aperture through the bottom pour ladle bottom flows out and formation alloy liquid stream 5.
Pressure is 150 kilograms per centimeter
2Nitrogen or argon gas, by air inlet pipe 1 enter the atomizing aggregator 2 in.
Air-flow through atomizing aggregator 2 is divided into two strands, and a stock-traders' know-how auxiliary jet 3 ejections to form negative pressure at alloy liquid flow export place, prevent to regurgitate; The supersonic speed impact air-flow that another stock-traders' know-how high speed jet pipe 4 acceleration formation flow velocity is 3.8 Mach numbers carries out spray atomization to alloy liquid stream 5, thereby forms the droplet of pulverizing 7.(Space Angle 6 of high speed jet pipe 4 should be controlled at 15 ° of-85 ° of scopes in) is that metal garden 8 pairs of droplets of sending forth 7 of dish of 12000 rev/mins carry out centrifugal atomizing and Quench with rotating speed, thereby obtains Nd-Fe-B spherical non-crystalline microcrystalline powder.Its magnetic energy product reaches (BH) max=7-20MGOe.
Embodiment
Adopt aforesaid method step and conditional parameter (1350 ℃ of liquid temperature, argon pressure 150 kilograms per centimeter
2Air velocity 3.8 Mach numbers, 12000 rev/mins of metal garden dish rotating speeds), and the Space Angle 6 of high speed jet pipe 4 adjusted to 30 °, to commercially available composition is (weight ratio): Nd25%, B0.5%, and the Nd Fe B alloys of Yu Weitie carries out compound atomizing, make granularity-150 purpose spherical non-crystalline microcrystalline powder, its magnetic energy product is (BH) max=14.5MGOe.
Use the prepared Nd-Fe-B spherical non-crystalline microcrystalline powder of method of the present invention to compare with the sheet non-crystalline microcrystalline powder that U.S. GM company produces, have a significant effect, it not only can save broken process and equipment, enhance productivity, and mainly be, improved the powder uniformity when making bonded magnetic material, eliminated the grain shape segregation, particle segregation, thereby improved the uniformity of magnetic property of the binding electromagnetic material of made, improved its machinability and surface smoothness simultaneously.
Claims (1)
1, a kind of preparation method of Nd-Fe-B spherical non-crystalline microcrystalline powder, comprise with high pressure nitrogen or argon gas and carry out spray atomization and carry out centrifugal atomizing with the centrifugal pan of high speed rotating, it is characterized in that: melting or remelting foundry alloy, its composition is (weight ratio): Nd23～40%, B0.3～3.8%, Yu Weitie;
With pressure is 150 liters/centimetre
2, flow velocity is that the nitrogen or the argon gas of 3.8 Mach numbers carries out spray atomization;
Be that 12000 rev/mins metal garden dish carries out centrifugal atomizing with rotating speed again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88108934 CN1014688B (en) | 1988-12-31 | 1988-12-31 | Process for preparing nd-fe-b spherical non-crystalline microcrystalline powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88108934 CN1014688B (en) | 1988-12-31 | 1988-12-31 | Process for preparing nd-fe-b spherical non-crystalline microcrystalline powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1043649A CN1043649A (en) | 1990-07-11 |
| CN1014688B true CN1014688B (en) | 1991-11-13 |
Family
ID=4835258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88108934 Expired CN1014688B (en) | 1988-12-31 | 1988-12-31 | Process for preparing nd-fe-b spherical non-crystalline microcrystalline powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1014688B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107011883A (en) * | 2017-03-30 | 2017-08-04 | 中国石油天然气股份有限公司 | It is a kind of for de-plugging agent of polymer-bearing waste-water water injection well and preparation method and application |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE0102103D0 (en) * | 2001-06-13 | 2001-06-13 | Hoeganaes Ab | High density soft magnetic products and method for the preparation thereof |
| CN101767200B (en) * | 2010-01-05 | 2012-05-09 | 北京科技大学 | Minute spherical Nd-Fe-B powder preparation method |
| CN103632834B (en) * | 2013-12-03 | 2015-12-02 | 江苏大学 | A kind of preparation method of high-performance anisotropic Nd-Fe-B |
| CN108188408B (en) * | 2018-01-04 | 2021-04-02 | 北京理工大学 | Spherical atomized magnesium-zinc amorphous alloy powder and preparation method thereof |
| CN111435617A (en) * | 2019-01-15 | 2020-07-21 | 绵阳市恒信磁性材料有限公司 | Preparation method of rare earth permanent magnetic material |
| CN110125435A (en) * | 2019-05-16 | 2019-08-16 | 南京航空航天大学 | A kind of amorphous Fe boron alloy electromagnetic-wave absorbent and preparation method thereof |
| CN112658272B (en) * | 2020-12-16 | 2023-04-28 | 杭州电子科技大学 | High-cooling gradient plasma arc-gas atomization composite powder preparation device and method |
-
1988
- 1988-12-31 CN CN 88108934 patent/CN1014688B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107011883A (en) * | 2017-03-30 | 2017-08-04 | 中国石油天然气股份有限公司 | It is a kind of for de-plugging agent of polymer-bearing waste-water water injection well and preparation method and application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1043649A (en) | 1990-07-11 |
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