CN105161282A - Neodymium-iron-boron magnet sintering method - Google Patents
Neodymium-iron-boron magnet sintering method Download PDFInfo
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- CN105161282A CN105161282A CN201510647066.4A CN201510647066A CN105161282A CN 105161282 A CN105161282 A CN 105161282A CN 201510647066 A CN201510647066 A CN 201510647066A CN 105161282 A CN105161282 A CN 105161282A
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Abstract
The invention discloses a neodymium-iron-boron magnet sintering method. The method comprises the steps of preparing a first alloy cast sheet and a second alloy cast sheet; smashing the first alloy cast sheet and the second alloy cast sheet into first alloy powder and second alloy powder, wherein the grain diameter of the first alloy powder and the grain diameter of the second alloy powder are 5 microns; mixing the first alloy powder and the second alloy powder and placing the mixture in a fully-automatic magnetic field forming machine to form a first matrix; conducting calcination and cooling at 700 DEG C, 800 DEG C and 1080 DEG C to obtain a neodymium-iron-boron magnet; electroplating a metal zinc layer which is 3 cm thick and a metal nickel layer which is 5 cm thick on the peripheral surface of the neodymium-iron-boron magnet in sequence. By the adoption of the method, the technology is simple, and the magnetic property of the prepared neodymium-iron-boron magnet is high.
Description
Technical field
The present invention relates to a kind of sintering method of neodymium iron boron magnetic body.
Background technology
Ndfeb magnet is the tetragonal crystal formed by neodymium, iron, boron, ndfeb magnet can be divided into Agglutinate neodymium-iron-boron and sintered NdFeB two kinds, ndfeb magnet is as third generation rare earth permanent-magnetic material, there is very high performance, it is widely used in the industries such as the energy, traffic, machinery, medical treatment, IT, household electrical appliances, it is particularly the development of the kownledge economy of representative along with information technology, constantly bring new purposes to functional materials such as rare earth permanent magnet neodymium iron boron industries, this brings more wide market prospects for neodymium iron boron industry.At present mostly be complex process preparing neodymium iron boron on the market, be not easy for widespread production.
Summary of the invention
An object of the present invention is to solve at least the problems referred to above, and the advantage will illustrated at least is below provided.
A further object of the invention is to provide a kind of sintering method of neodymium iron boron magnetic body, and not only technique is simple for it, and the neodymium iron boron magnetic body magnetic property of preparation is high.
In order to realize, according to these objects of the present invention and other advantage, providing a kind of sintering method of neodymium iron boron magnetic body, comprising:
Step 1, by the compound containing Nd, containing Eu compound, straight iron powder, cobaltous carbonate powder, boron oxide powder and boron nitride powder mixing, obtain the first hybrid solid powder; Sintered in the mist of hydrogen and nitrogen by first hybrid solid powder, obtaining chemical formula is Nd
12.02n
2lu
0.11fe
80.1b
5.67first alloy casting piece;
Step 2, choose purity be 99.5% neodymium metal powder, purity be 99.5% metallic cerium powder, straight iron powder, cobaltous carbonate powder, alundum (Al2O3) powder and the mixing of boron oxide powder, obtain the second hybrid solid powder, smelt in vacuum electromagnetic stove, obtaining chemical formula is Nd
37.2ce
12.8fe
40.88al
4.12b
3.1second alloy casting piece;
Step 3, employing ball milling milling method, be ground into the first alloy powder and the second alloy powder that particle diameter is 5 μm by the first alloy casting piece and the second alloy casting piece;
Step 4, be 1:1.5 mixing in mass ratio by the first alloy powder and the second alloy powder, obtain hybrid alloys powder, hybrid alloys powder is placed in full-automatic pressing under magnetic field machine shaping, obtains the first matrix;
Step 5, first matrix is calcined 30min at temperature is 700 DEG C, cooling, the first thick alloy powder of epoxy bond one deck 2cm is passed through at the outer surface of the first matrix, be placed in full-automatic pressing under magnetic field machine shaping, obtain matrix second matrix, at temperature is 800 DEG C, 40min is calcined by second, cooling, the outer surface of the second matrix passes through the second thick alloy powder of epoxy bond one deck 2cm, be placed in forming machine shaping, obtain matrix the 3rd matrix, 3rd matrix is calcined 40min at temperature is 900 DEG C, cooling, the thick hybrid alloys powder of epoxy bond one deck 2cm is passed through at the outer surface of the 3rd matrix, be placed in full-automatic pressing under magnetic field machine shaping, obtain the 4th matrix, 4th matrix is calcined 1h at temperature is 1080 DEG C, cooling, namely neodymium iron boron magnetic body is obtained,
Step 6, neodymium iron boron magnetic body outer peripheral face successively electroplating thickness be the metal nickel dam of 3cm metal zinc layers and 5cm.
Preferably, in the sintering method of described neodymium iron boron magnetic body, in described step 1, the particle diameter of straight iron powder is 20mm.
Preferably, in the sintering method of described neodymium iron boron magnetic body, in described step 4, the first alloy powder is placed in full-automatic pressing under magnetic field machine, at the alignment magnetic field compacted under of 1000kA/m, obtains matrix.
Preferably, in the sintering method of described neodymium iron boron magnetic body, in described step 5,
First matrix is calcined 30min at temperature is 700 DEG C, be cooled to 30 DEG C, the first thick alloy powder of epoxy bond one deck 2cm is passed through at the outer surface of the first matrix, be placed in full-automatic pressing under magnetic field machine shaping, obtain matrix second matrix, at temperature is 800 DEG C, 40min is calcined by second, be cooled to 30 DEG C, the outer surface of the second matrix passes through the second thick alloy powder of epoxy bond one deck 2cm, be placed in forming machine shaping, obtain matrix the 3rd matrix, 3rd matrix is calcined 40min at temperature is 900 DEG C, be cooled to 30 DEG C, the thick hybrid alloys powder of epoxy bond one deck 2cm is passed through at the outer surface of the 3rd matrix, be placed in full-automatic pressing under magnetic field machine shaping, obtain the 4th matrix, 4th matrix is calcined 1h at temperature is 1080 DEG C, cooling, namely neodymium iron boron magnetic body is obtained.
The present invention at least comprises following beneficial effect: bonding technology and sintering technology are organically combined in the present invention, by the compression forming in advance that bonds, make it completely shaping by sintering again, prepare neodymium-iron-boron ferromagnetic property so high, and reduce the difficulty of production technology; Of the present inventionly in sintering process, adopt the method successively sintered, it can make neodymium iron boron magnetic body form good crystal, reduces the non-magnetic tropism of magnet, improves the magnetic of ndfeb magnet; Adopt two kinds of alloy casting pieces to prepare neodymium iron boron magnetic body in the present invention, it can form good crystal formation, effective enhancing neodymium iron boron magnetic body magnetic.
Part is embodied by explanation below by other advantage of the present invention, target and feature, part also will by research and practice of the present invention by those skilled in the art is understood.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to specification word to make those skilled in the art.
Should be appreciated that used hereinly such as " to have ", other element one or more do not allotted in " comprising " and " comprising " term or the existence of its combination or interpolation.
As shown in Figure 1, the invention provides a kind of sintering method of neodymium iron boron magnetic body, comprising:
Step 1, by the compound containing Nd, containing Eu compound, straight iron powder, cobaltous carbonate powder, boron oxide powder and boron nitride powder mixing, obtain the first hybrid solid powder; Sintered in the mist of hydrogen and nitrogen by first hybrid solid powder, obtaining chemical formula is Nd
12.02n
2lu
0.11fe
80.1b
5.67first alloy casting piece;
Step 2, choose purity be 99.5% neodymium metal powder, purity be 99.5% metallic cerium powder, straight iron powder, cobaltous carbonate powder, alundum (Al2O3) powder and the mixing of boron oxide powder, obtain the second hybrid solid powder, smelt in vacuum electromagnetic stove, obtaining chemical formula is Nd
37.2ce
12.8fe
40.88al
4.12b
3.1second alloy casting piece;
Step 3, employing ball milling milling method, be ground into the first alloy powder and the second alloy powder that particle diameter is 5 μm by the first alloy casting piece and the second alloy casting piece;
Step 4, be 1:1.5 mixing in mass ratio by the first alloy powder and the second alloy powder, obtain hybrid alloys powder, hybrid alloys powder is placed in full-automatic pressing under magnetic field machine shaping, obtains the first matrix;
Step 5, first matrix is calcined 30min at temperature is 700 DEG C, cooling, the first thick alloy powder of epoxy bond one deck 2cm is passed through at the outer surface of the first matrix, be placed in full-automatic pressing under magnetic field machine shaping, obtain matrix second matrix, at temperature is 800 DEG C, 40min is calcined by second, cooling, the outer surface of the second matrix passes through the second thick alloy powder of epoxy bond one deck 2cm, be placed in forming machine shaping, obtain matrix the 3rd matrix, 3rd matrix is calcined 40min at temperature is 900 DEG C, cooling, the thick hybrid alloys powder of epoxy bond one deck 2cm is passed through at the outer surface of the 3rd matrix, be placed in full-automatic pressing under magnetic field machine shaping, obtain the 4th matrix, 4th matrix is calcined 1h at temperature is 1080 DEG C, cooling, namely neodymium iron boron magnetic body is obtained, in sintering process, adopt the method successively sintered, make neodymium iron boron magnetic body form good crystal, reduce the non-magnetic tropism of magnet, improve the magnetic of neodymium iron boron magnetic body,
Step 6, neodymium iron boron magnetic body outer peripheral face successively electroplating thickness be the metal nickel dam of 3cm metal zinc layers and 5cm; Play good corrosion-resistant effect.
Another kind of execution mode, in step 1, the particle diameter of straight iron powder is 20mm.
Another kind of execution mode, in step 4, is placed in full-automatic pressing under magnetic field machine by the first alloy powder, at the alignment magnetic field compacted under of 1000kA/m, obtains matrix.
Another kind of execution mode, in step 5,
First matrix is calcined 30min at temperature is 700 DEG C, be cooled to 30 DEG C, the first thick alloy powder of epoxy bond one deck 2cm is passed through at the outer surface of the first matrix, be placed in full-automatic pressing under magnetic field machine shaping, obtain matrix second matrix, at temperature is 800 DEG C, 40min is calcined by second, be cooled to 30 DEG C, the outer surface of the second matrix passes through the second thick alloy powder of epoxy bond one deck 2cm, be placed in forming machine shaping, obtain matrix the 3rd matrix, 3rd matrix is calcined 40min at temperature is 900 DEG C, be cooled to 30 DEG C, the thick hybrid alloys powder of epoxy bond one deck 2cm is passed through at the outer surface of the 3rd matrix, be placed in full-automatic pressing under magnetic field machine shaping, obtain the 4th matrix, 4th matrix is calcined 1h at temperature is 1080 DEG C, cooling, namely neodymium iron boron magnetic body is obtained.
Although embodiment of the present invention are open as above, but it is not restricted to listed in specification and execution mode utilization, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.
Claims (4)
1. a sintering method for neodymium iron boron magnetic body, is characterized in that, comprising:
Step 1, by the compound containing Nd, containing Eu compound, straight iron powder, cobaltous carbonate powder, boron oxide powder and boron nitride powder mixing, obtain the first hybrid solid powder; Sintered in the mist of hydrogen and nitrogen by first hybrid solid powder, obtaining chemical formula is Nd
12.02n
2lu
0.11fe
80.1b
5.67first alloy casting piece;
Step 2, choose purity be 99.5% neodymium metal powder, purity be 99.5% metallic cerium powder, straight iron powder, cobaltous carbonate powder, alundum (Al2O3) powder and the mixing of boron oxide powder, obtain the second hybrid solid powder, smelt in vacuum electromagnetic stove, obtaining chemical formula is Nd
37.2ce
12.8fe
40.88al
4.12b
3.1second alloy casting piece;
Step 3, employing ball milling milling method, be ground into the first alloy powder and the second alloy powder that particle diameter is 5 μm by the first alloy casting piece and the second alloy casting piece;
Step 4, be 1:1.5 mixing in mass ratio by the first alloy powder and the second alloy powder, obtain hybrid alloys powder, hybrid alloys powder is placed in full-automatic pressing under magnetic field machine shaping, obtains the first matrix;
Step 5, first matrix is calcined 30min at temperature is 700 DEG C, cooling, the first thick alloy powder of epoxy bond one deck 2cm is passed through at the outer surface of the first matrix, be placed in full-automatic pressing under magnetic field machine shaping, obtain matrix second matrix, at temperature is 800 DEG C, 40min is calcined by second, cooling, the outer surface of the second matrix passes through the second thick alloy powder of epoxy bond one deck 2cm, be placed in forming machine shaping, obtain matrix the 3rd matrix, 3rd matrix is calcined 40min at temperature is 900 DEG C, cooling, the thick hybrid alloys powder of epoxy bond one deck 2cm is passed through at the outer surface of the 3rd matrix, be placed in full-automatic pressing under magnetic field machine shaping, obtain the 4th matrix, 4th matrix is calcined 1h at temperature is 1080 DEG C, cooling, namely neodymium iron boron magnetic body is obtained,
Step 6, neodymium iron boron magnetic body outer peripheral face successively electroplating thickness be the metal nickel dam of 3cm metal zinc layers and 5cm.
2. the sintering method of neodymium iron boron magnetic body as claimed in claim 1, it is characterized in that, in described step 1, the particle diameter of straight iron powder is 20mm.
3. the sintering method of neodymium iron boron magnetic body as claimed in claim 1, is characterized in that, in described step 4, the first alloy powder is placed in full-automatic pressing under magnetic field machine, at the alignment magnetic field compacted under of 1000kA/m, obtains matrix.
4. the sintering method of neodymium iron boron magnetic body as claimed in claim 4, is characterized in that, in described step 5,
First matrix is calcined 30min at temperature is 700 DEG C, be cooled to 30 DEG C, the first thick alloy powder of epoxy bond one deck 2cm is passed through at the outer surface of the first matrix, be placed in full-automatic pressing under magnetic field machine shaping, obtain matrix second matrix, at temperature is 800 DEG C, 40min is calcined by second, be cooled to 30 DEG C, the outer surface of the second matrix passes through the second thick alloy powder of epoxy bond one deck 2cm, be placed in forming machine shaping, obtain matrix the 3rd matrix, 3rd matrix is calcined 40min at temperature is 900 DEG C, be cooled to 30 DEG C, the thick hybrid alloys powder of epoxy bond one deck 2cm is passed through at the outer surface of the 3rd matrix, be placed in full-automatic pressing under magnetic field machine shaping, obtain the 4th matrix, 4th matrix is calcined 1h at temperature is 1080 DEG C, cooling, namely neodymium iron boron magnetic body is obtained.
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| JPH0339451A (en) * | 1989-07-04 | 1991-02-20 | Daido Steel Co Ltd | Permanent magnet material |
| CN101325109A (en) * | 2008-04-08 | 2008-12-17 | 浙江大学 | High-strength tenacity agglomeration neodymium-iron-boron magnet reconstructed by crystal boundary phase and preparation method thereof |
| JP2009249729A (en) * | 2008-04-10 | 2009-10-29 | Showa Denko Kk | R-t-b-base alloy, process for producing r-t-b-base alloy, fine powder for r-t-b-base rare earth permanent magnet, r-t-b-base rare earth permanent magnet, and process for producing r-t-b-base rare earth permanent magnet |
| CN102456458A (en) * | 2010-10-15 | 2012-05-16 | 中国科学院宁波材料技术与工程研究所 | High-corrosion-resistance sintered neodymium iron boron magnet and preparation method thereof |
| CN102800454A (en) * | 2012-08-30 | 2012-11-28 | 钢铁研究总院 | Low-cost double-main phase Ce permanent-magnet alloy and preparation method thereof |
| CN103123838A (en) * | 2013-01-30 | 2013-05-29 | 浙江大学 | Rare earth permanent magnet produced by applying abundant rare earth MM and preparation method thereof |
| CN103187133A (en) * | 2013-03-20 | 2013-07-03 | 钢铁研究总院 | Rare earth permanent magnetic alloy and magnetic phase composite preparation method thereof |
-
2015
- 2015-10-08 CN CN201510647066.4A patent/CN105161282B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0339451A (en) * | 1989-07-04 | 1991-02-20 | Daido Steel Co Ltd | Permanent magnet material |
| CN101325109A (en) * | 2008-04-08 | 2008-12-17 | 浙江大学 | High-strength tenacity agglomeration neodymium-iron-boron magnet reconstructed by crystal boundary phase and preparation method thereof |
| JP2009249729A (en) * | 2008-04-10 | 2009-10-29 | Showa Denko Kk | R-t-b-base alloy, process for producing r-t-b-base alloy, fine powder for r-t-b-base rare earth permanent magnet, r-t-b-base rare earth permanent magnet, and process for producing r-t-b-base rare earth permanent magnet |
| CN102456458A (en) * | 2010-10-15 | 2012-05-16 | 中国科学院宁波材料技术与工程研究所 | High-corrosion-resistance sintered neodymium iron boron magnet and preparation method thereof |
| CN102800454A (en) * | 2012-08-30 | 2012-11-28 | 钢铁研究总院 | Low-cost double-main phase Ce permanent-magnet alloy and preparation method thereof |
| CN103123838A (en) * | 2013-01-30 | 2013-05-29 | 浙江大学 | Rare earth permanent magnet produced by applying abundant rare earth MM and preparation method thereof |
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