CN105161282B - The sintering method of neodymium iron boron magnetic body - Google Patents
The sintering method of neodymium iron boron magnetic body Download PDFInfo
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- CN105161282B CN105161282B CN201510647066.4A CN201510647066A CN105161282B CN 105161282 B CN105161282 B CN 105161282B CN 201510647066 A CN201510647066 A CN 201510647066A CN 105161282 B CN105161282 B CN 105161282B
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Abstract
The invention discloses a kind of sintering method of neodymium iron boron magnetic body, including：Prepare the first and second alloy casting pieces；First and second alloy casting pieces are ground into the first and second alloy powders that particle diameter is 5 μm；Mixing, is placed in full-automatic pressing under magnetic field machine and is molded, obtain the first matrix；Calcined at being 700 DEG C, 800 DEG C and 1080 DEG C in temperature, cool down, obtain neodymium iron boron magnetic body；Neodymium iron boron magnetic body outer peripheral face successively electroplating thickness be 3cm metals zinc layers and 5cm metal nickel dam.Not only technique is simple by the present invention, and the neodymium iron boron magnetic body magnetic property prepared 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
Two kinds of sintered NdFeB, ndfeb magnet have very high performance, it is widely used in energy as third generation rare earth permanent-magnetic material
The industries such as source, traffic, machinery, medical treatment, IT, household electrical appliances, the development in particular with information technology for the kownledge economy of representative, to dilute
The functional materials such as native permanent magnet ndfeb industry constantly bring new purposes, and this is before more wide market is come in neodymium iron boron industrial zone
Scape.It is mostly at present complex process preparing neodymium iron boron on the market, is not readily used for producing extensively.
The content of the invention
It is an object of the invention to solve at least the above, and provide the advantages of at least will be described later.
It is a still further object of the present invention to provide a kind of sintering method of neodymium iron boron magnetic body, 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 object of the present invention and further advantage, there is provided a kind of sintering side of neodymium iron boron magnetic body
Method, including：
Step 1, the compound containing Nd, the compound containing Lu, straight iron powder, boron oxide powder and boron nitride powder mixed
Close, obtain the first hybrid solid powder；First hybrid solid powder is sintered in the mixed gas of hydrogen and nitrogen, changed
Formula is Nd12.02N2Lu0.11Fe80.1B5.67First alloy casting piece；
Step 2, choose purity be 99.5% neodymium metal powder, purity be 99.5% metallic cerium powder, straight iron powder, three oxidation
Two aluminium powders and the mixing of boron oxide powder, obtain the second hybrid solid powder, are smelted in vacuum electromagnetic stove, obtaining chemical formula is
Nd37.2Ce12.8Fe40.88Al4.12B3.1Second alloy casting piece；
Step 3, using ball milling milling method, it is 5 μm that the first alloy casting piece and the second alloy casting piece are ground into particle diameter
First alloy powder and the second alloy powder；
Step 4, by the first alloy powder and the second alloy powder it is 1 in mass ratio:1.5 mixing, obtain hybrid alloys powder
End, hybrid alloys powder is placed in full-automatic pressing under magnetic field machine and is molded, obtains the first matrix；
Step 5, by the first matrix temperature be 700 DEG C at calcine 30min, cool down, pass through in the outer surface of the first matrix
Epoxy resin bonds the first thick alloy powders of one layer of 2cm, is placed in full-automatic pressing under magnetic field machine and is molded, obtains the second matrix, will
Second matrix calcines 40min at being 800 DEG C in temperature, cools down, and the outer surface of the second matrix bonds one layer of 2cm by epoxy resin
The second thick alloy powder, is placed in forming machine and is molded, obtain the matrix of matrix the 3rd, is forged at being 900 DEG C in temperature by the 3rd matrix
40min is burnt, cooling, the thick hybrid alloys powder of one layer of 2cm is bonded by epoxy resin in the outer surface of the 3rd matrix, is placed in complete
It is molded in automatic pressing under magnetic field machine, obtains the 4th matrix, is calcined 1h at being 1080 DEG C in temperature by the 4th matrix, cool down, produce
To neodymium iron boron magnetic body；
Step 6, neodymium iron boron magnetic body outer peripheral face successively electroplating thickness be 3cm metals zinc layers and 5cm metal nickel dam.
Preferably, in the sintering method of described neodymium iron boron magnetic body, in the step 1, the particle diameter of straight iron powder is 20mm.
Preferably, in the sintering method of described neodymium iron boron magnetic body, in the step 4, the first alloy powder is placed in
In full-automatic pressing under magnetic field machine, it is molded under 1000kA/m alignment magnetic field, obtains matrix.
Preferably, in the sintering method of described neodymium iron boron magnetic body, in the step 5,
30min is calcined at being 700 DEG C in temperature by the first matrix, 30 DEG C is cooled to, passes through in the outer surface of the first matrix
Epoxy resin bonds the first thick alloy powders of one layer of 2cm, is placed in full-automatic pressing under magnetic field machine and is molded, obtains the second matrix, will
Second matrix calcines 40min at being 800 DEG C in temperature, is cooled to 30 DEG C, the outer surface of the second matrix is bonded by epoxy resin
The second thick one layer of 2cm alloy powder, is placed in forming machine and is molded, obtain the matrix of matrix the 3rd, in temperature is 900 by the 3rd matrix
40min is calcined at DEG C, is cooled to 30 DEG C, bonding the thick mixing of one layer of 2cm by epoxy resin in the outer surface of the 3rd matrix closes
Bronze end, is placed in full-automatic pressing under magnetic field machine and is molded, obtain the 4th matrix, is calcined at being 1080 DEG C in temperature by the 4th matrix
1h, cooling, that is, obtain neodymium iron boron magnetic body.
The present invention comprises at least following beneficial effect：Bonding technology and sintering technology are organically combined in the present invention, passed through
Advance compression forming is bonded, then it is molded completely by sintering, neodymium-iron-boron ferromagnetic property height is prepared out, and reduce
The difficulty of production technology；The present invention's uses the method successively sintered in sintering process, and it is good that it can be formed neodymium iron boron magnetic body
Good crystal, the non-magnetic tropism of magnet is reduced, improve the magnetic of ndfeb magnet；Prepared in the present invention using two kinds of alloy casting pieces
Neodymium iron boron magnetic body, it can form good crystal formation, effective to strengthen neodymium iron boron magnetic body magnetic.
Further advantage, target and the feature of the present invention embodies part by following explanation, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification text
Word can be implemented according to this.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein do not allot one or more
The presence or addition of individual other elements or its combination.
As shown in figure 1, the present invention provides a kind of sintering method of neodymium iron boron magnetic body, including：
Step 1, the compound containing Nd, the compound containing Lu, straight iron powder, boron oxide powder and boron nitride powder mixed
Close, obtain the first hybrid solid powder；First hybrid solid powder is sintered in the mixed gas of hydrogen and nitrogen, changed
Formula is Nd12.02N2Lu0.11Fe80.1B5.67First alloy casting piece；
Step 2, choose purity be 99.5% neodymium metal powder, purity be 99.5% metallic cerium powder, straight iron powder, three oxidation
Two aluminium powders and the mixing of boron oxide powder, obtain the second hybrid solid powder, are smelted in vacuum electromagnetic stove, obtaining chemical formula is
Nd37.2Ce12.8Fe40.88Al4.12B3.1Second alloy casting piece；
Step 3, using ball milling milling method, it is 5 μm that the first alloy casting piece and the second alloy casting piece are ground into particle diameter
First alloy powder and the second alloy powder；
Step 4, by the first alloy powder and the second alloy powder it is 1 in mass ratio:1.5 mixing, obtain hybrid alloys powder
End, hybrid alloys powder is placed in full-automatic pressing under magnetic field machine and is molded, obtains the first matrix；
Step 5, by the first matrix temperature be 700 DEG C at calcine 30min, cool down, pass through in the outer surface of the first matrix
Epoxy resin bonds the first thick alloy powders of one layer of 2cm, is placed in full-automatic pressing under magnetic field machine and is molded, obtains the second matrix, will
Second matrix calcines 40min at being 800 DEG C in temperature, cools down, and the outer surface of the second matrix bonds one layer of 2cm by epoxy resin
The second thick alloy powder, is placed in forming machine and is molded, obtain the matrix of matrix the 3rd, is forged at being 900 DEG C in temperature by the 3rd matrix
40min is burnt, cooling, the thick hybrid alloys powder of one layer of 2cm is bonded by epoxy resin in the outer surface of the 3rd matrix, is placed in complete
It is molded in automatic pressing under magnetic field machine, obtains the 4th matrix, is calcined 1h at being 1080 DEG C in temperature by the 4th matrix, cool down, produce
To neodymium iron boron magnetic body；Using the method successively sintered in sintering process, neodymium iron boron magnetic body is formed good crystal, reduce magnetic
The non-magnetic tropism of body, improve the magnetic of neodymium iron boron magnetic body；
Step 6, neodymium iron boron magnetic body outer peripheral face successively electroplating thickness be 3cm metals zinc layers and 5cm metal nickel dam；Rise
Acted on to good corrosion-resistant.
Another embodiment, in step 1, the particle diameter of straight iron powder is 20mm.
Another embodiment, in step 4, the first alloy powder is placed in full-automatic pressing under magnetic field machine, in 1000kA/
It is molded under m alignment magnetic field, obtains matrix.
Another embodiment, in step 5,
30min is calcined at being 700 DEG C in temperature by the first matrix, 30 DEG C is cooled to, passes through in the outer surface of the first matrix
Epoxy resin bonds the first thick alloy powders of one layer of 2cm, is placed in full-automatic pressing under magnetic field machine and is molded, obtains the second matrix, will
Second matrix calcines 40min at being 800 DEG C in temperature, is cooled to 30 DEG C, the outer surface of the second matrix is bonded by epoxy resin
The second thick one layer of 2cm alloy powder, is placed in forming machine and is molded, obtain the matrix of matrix the 3rd, in temperature is 900 by the 3rd matrix
40min is calcined at DEG C, is cooled to 30 DEG C, bonding the thick mixing of one layer of 2cm by epoxy resin in the outer surface of the 3rd matrix closes
Bronze end, is placed in full-automatic pressing under magnetic field machine and is molded, obtain the 4th matrix, is calcined at being 1080 DEG C in temperature by the 4th matrix
1h, cooling, that is, obtain neodymium iron boron magnetic body.
Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listed
With it can be applied to various suitable the field of the invention completely, can be easily for those skilled in the art
Other modification is realized, therefore under the universal limited without departing substantially from claim and equivalency range, it is of the invention and unlimited
In specific details and shown here as the legend with description.
Claims (4)
- A kind of 1. sintering method of neodymium iron boron magnetic body, it is characterised in that including：Step 1, by the compound containing Nd, the compound containing Lu, straight iron powder, boron oxide powder and boron nitride powder mix, Obtain the first hybrid solid powder；First hybrid solid powder is sintered in the mixed gas of hydrogen and nitrogen, obtains chemistry Formula is Nd12.02N2Lu0.11Fe80.1B5.67First alloy casting piece；Step 2, choose purity be 99.5% neodymium metal powder, purity be 99.5% metallic cerium powder, straight iron powder, alundum (Al2O3) Powder and the mixing of boron oxide powder, obtain the second hybrid solid powder, are smelted in vacuum electromagnetic stove, obtaining chemical formula is Nd37.2Ce12.8Fe40.88Al4.12B3.1Second alloy casting piece；Step 3, using ball milling milling method, the first alloy casting piece and the second alloy casting piece are ground into that particle diameter is 5 μm first Alloy powder and the second alloy powder；Step 4, by the first alloy powder and the second alloy powder it is 1 in mass ratio:1.5 mixing, obtain hybrid alloys powder, will Hybrid alloys powder is placed in full-automatic pressing under magnetic field machine and is molded, and obtains the first matrix；Step 5, by the first matrix temperature be 700 DEG C at calcine 30min, cool down, pass through epoxy in the outer surface of the first matrix The first thick resin-bonded one layer of 2cm alloy powder, is placed in full-automatic pressing under magnetic field machine and is molded, obtain the second matrix, by second Matrix calcines 40min at being 800 DEG C in temperature, cools down, and the outer surface of the second matrix passes through one layer of 2cm thickness of epoxy resin bonding Second alloy powder, is placed in forming machine and is molded, and obtains the matrix of matrix the 3rd, is calcined at being 900 DEG C in temperature by the 3rd matrix 40min, cooling, the thick hybrid alloys powder of one layer of 2cm is bonded by epoxy resin in the outer surface of the 3rd matrix, be placed in it is complete from It is molded in moving field forming machine, obtains the 4th matrix, is calcined 1h at being 1080 DEG C in temperature by the 4th matrix, cool down, that is, obtain Neodymium iron boron magnetic body；Step 6, neodymium iron boron magnetic body outer peripheral face successively electroplating thickness be 3cm metals zinc layers and 5cm metal nickel dam.
- 2. the sintering method of neodymium iron boron magnetic body as claimed in claim 1, it is characterised in that in the step 1, the grain of straight iron powder Footpath is 20mm.
- 3. the sintering method of neodymium iron boron magnetic body as claimed in claim 1, it is characterised in that in the step 4, by the first alloy Powder is placed in full-automatic pressing under magnetic field machine, is molded under 1000kA/m alignment magnetic field, is obtained matrix.
- 4. the sintering method of neodymium iron boron magnetic body as claimed in claim 1, it is characterised in that in the step 5,30min is calcined at being 700 DEG C in temperature by the first matrix, 30 DEG C is cooled to, passes through epoxy in the outer surface of the first matrix The first thick resin-bonded one layer of 2cm alloy powder, is placed in full-automatic pressing under magnetic field machine and is molded, obtain the second matrix, by second Matrix calcines 40min at being 800 DEG C in temperature, is cooled to 30 DEG C, the outer surface of the second matrix bonds one layer by epoxy resin The second thick 2cm alloy powder, is placed in forming machine and is molded, obtain the matrix of matrix the 3rd, by the 3rd matrix in the case where temperature is 900 DEG C 40min is calcined, is cooled to 30 DEG C, the thick hybrid alloys powder of one layer of 2cm is bonded by epoxy resin in the outer surface of the 3rd matrix End, it is placed in full-automatic pressing under magnetic field machine and is molded, obtain the 4th matrix, 1h is calcined at being 1080 DEG C in temperature by the 4th matrix, Cooling, that is, obtain neodymium iron boron magnetic body.
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| JP2861074B2 (en) * | 1989-07-04 | 1999-02-24 | 大同特殊鋼株式会社 | Permanent magnet material |
| CN101325109B (en) * | 2008-04-08 | 2010-09-08 | 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 |
| CN102456458B (en) * | 2010-10-15 | 2017-02-08 | 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 |
| CN102800454B (en) * | 2012-08-30 | 2017-03-22 | 钢铁研究总院 | Low-cost double-main phase Ce permanent-magnet alloy and preparation method thereof |
| CN103123838B (en) * | 2013-01-30 | 2015-06-03 | 浙江大学 | Rare earth permanent magnet produced by applying abundant rare earth MM and preparation method thereof |
| CN103187133B (en) * | 2013-03-20 | 2016-04-27 | 钢铁研究总院 | A kind of RE permanent magnetic alloy and Magnetic Phase composite preparation process thereof |
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