CN104064347A - Method for sintering neodymium-iron-boron permanent magnet material - Google Patents
Method for sintering neodymium-iron-boron permanent magnet material Download PDFInfo
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- CN104064347A CN104064347A CN201410279197.7A CN201410279197A CN104064347A CN 104064347 A CN104064347 A CN 104064347A CN 201410279197 A CN201410279197 A CN 201410279197A CN 104064347 A CN104064347 A CN 104064347A
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Abstract
The invention discloses a method for sintering a neodymium-iron-boron permanent magnet material. The sintering method comprises the following steps: preparation: placing a neodymium-iron-boron green body into a graphite box, filling high-adsorptivity high-temperature powder, and covering the graphite box with a graphite cover for enclosing; furnace feeding: feeding the boxed neodymium-iron-boron green body into the sintering space in a furnace; sintering: sintering the neodymium-iron-boron green body into a neodymium-iron-boron magnet. According to the method for sintering the neodymium-iron-boron permanent magnet material, the neodymium-iron-boron green body is buried by using the high-adsorptivity high-temperature powder to be isolated from the air, and the sintering space in the furnace is filled with inertia gas, so that the neodymium-iron-boron green body can be prevented from being oxidized by being contacted with the air before being fed into the furnace and being oxidized in the sintering process of a product.
Description
Technical field
The present invention relates to the manufacture field of NdFeB material, particularly a kind of sintering method of Nd-Fe-Bo permanent magnet material.
Background technology
At present, the known sintering technology for neodymium iron boron magnetic body is normal-pressure vacuum sintering process, the method is that neodymium iron boron green compact are emitted on bin and are directly fired directly into stove, and the ingress of air that neodymium iron boron green compact can be of short duration in the process that enters stove easily causes the oxidation of green compact.In addition, in sintering procedure, heat the oxidation on inhomogeneous and green compact surface due to neodymium iron boron green compact, easily cause product be heated inhomogeneous and be oxidized, so that the magnetic property of product is inhomogeneous, in order to reduce this impact, improve the qualification rate of product, must increase product magnetic property standard, so just need to, enough height of neodymium iron boron formula ability design, indirectly increase manufacturing cost.
Also have, the sintering technology of existing neodymium iron boron magnetic body can only adopt normal-pressure vacuum sintering process, make the exhaust smoothly in sintering procedure of neodymium iron boron green compact, but the fine and close required temperature and time of neodymium iron boron green sintering is oversize under atmospheric pressure state, has a strong impact on the Energy Efficiency Ratio of product.
The information that is disclosed in this background technology part is only intended to increase the understanding to general background of the present invention, and should not be regarded as admitting or imply that in any form this information structure has been the known prior art of persons skilled in the art.
Summary of the invention
The object of the present invention is to provide a kind of sintering method of Nd-Fe-Bo permanent magnet material of simple and reasonable steps, the high temperature resistant powder of the sintering method of this Nd-Fe-Bo permanent magnet material by high adsorption buries to completely cut off itself and the contacting of air by neodymium iron boron green compact, and be full of the sintering space in stove with inert gas, can avoid neodymium iron boron green compact to be oxidized entering stokehold ingress of air and product sintering process in oxidation.In addition, the sintering method of this Nd-Fe-Bo permanent magnet material makes the exhaust smoothly in sintering procedure of neodymium iron boron green compact, under high pressure carry out malleation sintering to realize neodymium iron boron product, malleation sintering shortens saving sintering time, the electricity charge and the temperature retention time of product, has reduced sintering expense.
For achieving the above object, the invention provides the sintering method of Nd-Fe-Bo permanent magnet material, concrete steps comprise: preparation process: neodymium iron boron green compact are placed in graphite, are then packed into the high temperature resistant powder of high adsorption, the graphite cover that then covers graphite seals; Enter stove step: the neodymium iron boron green compact that install box are sent into the sintering space in stove; Sintering step: neodymium iron boron green sintering is become to neodymium iron boron magnetic body.
Preferably, in technique scheme, in preparation process, need neodymium iron boron green compact to be placed in graphite under the protection of nitrogen.
Preferably, in technique scheme, the weight of the graphite cover of the graphite in preparation process is 2-4Kg.
Preferably, in technique scheme, the high temperature resistant powder of high adsorption in preparation process is titanium oxide.
Preferably, in technique scheme, enter before the neodymium iron boron green compact that install box being sent into the sintering space in stove in stove step and be first full of the sintering space in stove with inert gas.
Preferably, in technique scheme, the neodymium iron boron green compact in sintering step carry out malleation sintering under 0.2-0.4Mpa.
Compared with prior art, the present invention has following beneficial effect: the high temperature resistant powder of the sintering method of this Nd-Fe-Bo permanent magnet material by high adsorption buries to completely cut off itself and the contacting of air by neodymium iron boron green compact, and be full of the sintering space in stove with inert gas, can avoid neodymium iron boron green compact to be oxidized entering stokehold ingress of air and product sintering process in oxidation.In addition, the sintering method of this Nd-Fe-Bo permanent magnet material makes the exhaust smoothly in sintering procedure of neodymium iron boron green compact, under high pressure carry out malleation sintering to realize neodymium iron boron product, malleation sintering shortens saving sintering time, the electricity charge and the temperature retention time of product, has reduced sintering expense.
Brief description of the drawings
Fig. 1 is the flow chart of the sintering method of Nd-Fe-Bo permanent magnet material of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention is not subject to the restriction of embodiment.
Unless separately there is other clearly to represent, otherwise in whole specification and claims, term " comprises " or its conversion was stated being understood to include as " comprising " or " including " etc. element or part, and do not get rid of other element or other part.
As shown in Figure 1, comprise according to the concrete steps of the sintering method of the Nd-Fe-Bo permanent magnet material of the specific embodiment of the invention:
1) preparation process: neodymium iron boron green compact, under the protection of nitrogen, are placed in graphite, are then packed into the high temperature resistant powder of high adsorption, make these neodymium iron boron green compact and air isolated, the graphite cover that then covers graphite seals.
Wherein, neodymium iron boron green compact are buried with the high temperature resistant powder of high adsorption, completely cut off contacting of neodymium iron boron green compact and air, can avoid neodymium iron boron green compact to be oxidized entering stokehold ingress of air.The high temperature resistant powder of high adsorption used herein must have heat-resisting quantity and strong adsorptivity, and its sintering temperature is higher than the sintering temperature of neodymium iron boron green compact, make it that scorification can not occur in the process of neodymium iron boron green sintering, and become the impurity that is bonded in neodymium-iron-boron surface.In addition, the high temperature resistant powder of high adsorption will have chemical inertness, does not react with neodymium iron boron green compact.Preferably, the high temperature resistant powder of high adsorption is titanium oxide.
In addition, preferred, the weight of the graphite cover of graphite is 2-4Kg.
2) enter stove step: be first full of the sintering space in stove with inert gas, then the neodymium iron boron green compact that install box sent into the sintering space in stove.
3) sintering step: neodymium iron boron green sintering is become to neodymium iron boron magnetic body.
First, neodymium iron boron green compact are imbedded in the high temperature resistant powder of high adsorption of graphite, can utilize the high adsorption of the high temperature resistant powder of high adsorption to make the exhaust smoothly in sintering procedure of neodymium iron boron green compact, under 0.2-0.4Mpa, carry out malleation sintering to realize neodymium iron boron product, this malleation sintering has shortened saving sintering time, the electricity charge and the temperature retention time of product, has reduced sintering expense.
In addition, neodymium iron boron green compact are imbedded in the high temperature resistant powder of high adsorption of graphite, can utilize the heat conductivity of the high temperature resistant powder of graphite and high adsorption (the present embodiment employing titanium oxide) to improve the neodymium iron boron green compact uneven defect of being heated, and then improve the uniformity of neodymium iron boron magnetic body magnetic property.
Further, be full of the sintering space in stove with inert gas, can further ensure can not produce in sintering process the oxidation of neodymium iron boron magnetic body.
The sintering process of the sintering method of the Nd-Fe-Bo permanent magnet material of the specific embodiment of the invention is shown in following formula:
The sintering process of normal pressure product is shown in following formula:
The sintering time of the sintering method of the Nd-Fe-Bo permanent magnet material of the specific embodiment of the invention amounts to 1930 minutes, and the sintering time of existing normal pressure product amounts to 2610 minutes, two kinds of methods are compared sintering time and are amounted to minimizing: (2610-1930)/2610=26%.
The magnetic property table of comparisons of two kinds of methods:
Find by above Data Comparison, the scope of Br is reduced to 0.067% by 0.14%; The scope of Hcj is reduced to 1.97% by 5.97%; The scope of Hk is reduced to 1.94% by 7.57%.The magnetic property consistency of the sintering method sintered products of the Nd-Fe-Bo permanent magnet material of the specific embodiment of the invention significantly improves.
To sum up, the high temperature resistant powder of the sintering method of this Nd-Fe-Bo permanent magnet material by high adsorption buries to completely cut off itself and the contacting of air by neodymium iron boron green compact, and be full of the sintering space in stove with inert gas, can avoid neodymium iron boron green compact to be oxidized entering stokehold ingress of air and product sintering process in oxidation.In addition, the sintering method of this Nd-Fe-Bo permanent magnet material makes the exhaust smoothly in sintering procedure of neodymium iron boron green compact, under high pressure carry out malleation sintering to realize neodymium iron boron product, malleation sintering shortens saving sintering time, the electricity charge and the temperature retention time of product, has reduced sintering expense.
The aforementioned description to concrete exemplary of the present invention is in order to illustrate and the object of illustration.These descriptions not want the present invention to be defined as disclosed precise forms, and obviously, according to above-mentioned instruction, can much change and change.Exemplary embodiment is selected and the object described is to explain certain principles of the present invention and practical application thereof, thereby made those skilled in the art can realize and utilize various exemplary of the present invention and various selection and change.Scope of the present invention is intended to be limited by claims and equivalents thereof.
Claims (6)
1. a sintering method for Nd-Fe-Bo permanent magnet material, is characterized in that, comprises the following steps:
Preparation process: neodymium iron boron green compact are placed in graphite, are then packed into the high temperature resistant powder of high adsorption, the graphite cover that then covers graphite seals;
Enter stove step: the neodymium iron boron green compact that install box are sent into the sintering space in stove;
Sintering step: neodymium iron boron green sintering is become to neodymium iron boron magnetic body.
2. the sintering method of Nd-Fe-Bo permanent magnet material according to claim 1, is characterized in that, in described preparation process, neodymium iron boron green compact is placed in graphite under the protection of nitrogen.
3. the sintering method of Nd-Fe-Bo permanent magnet material according to claim 1, is characterized in that, the weight of the graphite cover of the graphite in described preparation process is 2-4Kg.
4. according to the sintering method of the Nd-Fe-Bo permanent magnet material described in any one in claims 1 to 3, it is characterized in that, the high temperature resistant powder of high adsorption in described preparation process is titanium oxide.
5. the sintering method of Nd-Fe-Bo permanent magnet material according to claim 4, is characterized in that, described in enter before the neodymium iron boron green compact that install box being sent into the sintering space in stove in stove step and be first full of the sintering space in stove with inert gas.
6. the sintering method of Nd-Fe-Bo permanent magnet material according to claim 5, is characterized in that, the neodymium iron boron green compact in described sintering step carry out malleation sintering under 0.2-0.4Mpa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105321701A (en) * | 2015-07-01 | 2016-02-10 | 浙江东阳东磁稀土有限公司 | Sintering method and apparatus for rare earth neodymium-iron-boron magnet |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101266859A (en) * | 2008-01-08 | 2008-09-17 | 上海大学 | Method for quick sintering of micro-crystal ferrite magnetic core part |
| CN101425355A (en) * | 2008-07-31 | 2009-05-06 | 中国计量学院 | Pr/Nd based biphase composite permanent magnetic material and block body preparing method thereof |
| CN201266541Y (en) * | 2008-07-29 | 2009-07-01 | 宁波科宁达工业有限公司 | Sintering box for permanent magnet product |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101266859A (en) * | 2008-01-08 | 2008-09-17 | 上海大学 | Method for quick sintering of micro-crystal ferrite magnetic core part |
| CN201266541Y (en) * | 2008-07-29 | 2009-07-01 | 宁波科宁达工业有限公司 | Sintering box for permanent magnet product |
| CN101425355A (en) * | 2008-07-31 | 2009-05-06 | 中国计量学院 | Pr/Nd based biphase composite permanent magnetic material and block body preparing method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105321701A (en) * | 2015-07-01 | 2016-02-10 | 浙江东阳东磁稀土有限公司 | Sintering method and apparatus for rare earth neodymium-iron-boron magnet |
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Application publication date: 20140924 |