CN102451909B - A kind of sintering of sintered Nd-Fe-B permanent magnetic material and tempering method - Google Patents
A kind of sintering of sintered Nd-Fe-B permanent magnetic material and tempering method Download PDFInfo
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Abstract
The invention provides a kind of sintering and the tempering method of tying Nd-Fe-Bo permanent magnet material; described sintering and tempering method comprise: after in sintering furnace, sintered Nd-Fe-B permanent magnetic material sintering process terminates; be filled with protective gas; cooled fast by circulating cooling blower fan; and stack degree cooling material boat according to material boat; be cooled to the body of heater probe temperature of sintering furnace lower than product temperature 10 ~ 500 DEG C; material boat central temperature is higher than product temperature 0 ~ 100 DEG C; material boat peripheral temperature is lower than product temperature 0 ~ 300 DEG C; fast cool time is 3-30 minute, stops rapid cooling.The present invention has short, heating blower fan cool time and arrives temperature time short feature, achieves energy-conservation, timesaving effect.
Description
Technical field
The present invention relates to a kind of sintered Nd-Fe-B permanent magnetic material sintering and tempering method.
Background technology
Along with the development of international modern industrialization, energy problem, global warming issue become increasingly conspicuous, and energy-saving and emission-reduction become the pressing issues faced in every country enterprise development.The rare earth resources of China enriches, and is the big producing country of rare earth permanent magnet sintered NdFeB.The sintered NdFeB output in the whole world in 2008 reaches 6.6 ten thousand tons, and wherein the output of our country accounts for more than 50%.In sintered NdFeB production process, electric power energy consumption is mainly at sintering, tempering stage.
Existing sintering, tempering process mainly material are cooled to less than 80 DEG C after sintering, come out of the stove and again put or do not come out of the stove, then be warming up to temperature and carry out tempering process, above-mentioned technical process is long for cool time, it is slow that heating arrives equal temperature time, wastes time and electric power energy.
Summary of the invention
The present invention is just in order to overcome above-mentioned defect, make use of the heat radiation of sintering process, conduction principle fully, and in conjunction with the self-characteristic of sintered Nd-Fe-B permanent magnetic material, in the sintering, drawing process of sintered Nd-Fe-B permanent magnetic material, accomplish that cool time is short, heating process arrives the short feature of equal temperature time, achieves energy-conservation, timesaving effect.
According to the present invention, provide a kind of sintering and the tempering method of tying Nd-Fe-Bo permanent magnet material, described sintering and tempering method comprise: sintering after the sintered Nd-Fe-B permanent magnetic material sintering process in furnace charge boat terminates, be filled with protective gas, by circulating cooling blower fan, the sintered Nd-Fe-B permanent magnetic material in material boat is cooled fast, during the product temperature 10 ~ 500 DEG C of the body of heater probe temperature being cooled to sintering furnace lower than setting, now expect that boat central temperature is higher than product temperature 0 ~ 100 DEG C, material boat peripheral temperature is lower than product temperature 0 ~ 300 DEG C, fast cool time is 3-30 minute, stop rapid cooling, start heating, be warming up to temperature, enter tempering program.
Preferably, described sintering furnace is single chamber sintering furnace.
Preferably, described protective gas comprises argon gas, nitrogen.
Preferably, after stopping cooling, material boat, product and furnace body temperature are risen again rapidly, rise again in product temperature ± 200 DEG C of setting.
Because the present invention is in cooling procedure, material boat central temperature higher than peripheral temperature gradient (namely, Liao Zhouyou center reduces gradually to peripheral temperature), in body of heater heating process, material boat peripheral temperature is higher than expecting the gradient of boat central temperature (namely, material boat is raised to central temperature gradually by periphery, heat is by expecting that boat periphery transmits to Liao Zhou center), therefore the effect arriving temperature fast can be realized, realize material boat inside and outside to temperature evenly, fast, overcome in conventional sintering stove heating process, the Liao Zhou center material caused because of Gradient Effect is slow to temperature, for reaching a difficult problem for material samming and temperature retention time length.The present invention has short, heating blower fan cool time and arrives temperature time short feature, achieves energy-conservation, timesaving effect.
Detailed description of the invention
In order to understand structure of the present invention, feature and other objects further, the appended preferred embodiment of existing combination is described in detail as follows, and illustrated preferred embodiment is only for illustration of technical scheme of the present invention, and non-limiting the present invention.
Embodiment 1
Apply domestic RVS-300G type single-chamber vacuum sintering furnace, batch 300 kilograms/stove.After sintering procedure terminates, be filled with argon gas, start cycles cooling blower, be cooled to the product temperature 500 DEG C of body of heater probe temperature lower than setting of sintering furnace; Material boat central temperature is higher than product temperature 0 DEG C, and material boat peripheral temperature is lower than product temperature 300 DEG C, and fast cool time is 30 minutes, stops cooling.Heating, is warming up to product temperature, after tempering terminates, is cooled to room temperature, comes out of the stove.Performance test is carried out, properties of product test result: qualified with AMT-4 magnetization characteristic automatic measuring instrument.Achieve in sintering, tempering stage saving energy 240 kilowatt hour, the effect saved time 3 hours.
Embodiment 2
Apply domestic RVS-300G type single-chamber vacuum sintering furnace, batch 300 kilograms/stove.After sintering procedure terminates, be filled with nitrogen, start cycles cooling blower, be cooled to the product temperature 10 DEG C of body of heater probe temperature lower than setting of sintering furnace; Material boat central temperature is higher than product temperature 100 DEG C, and material boat peripheral temperature is lower than product temperature 0 DEG C, and fast cool time is 3 minutes, stops cooling.Heating, is warming up to product temperature, after tempering terminates, is cooled to room temperature, comes out of the stove.Performance test is carried out, properties of product test result: qualified with AMT-4 magnetization characteristic automatic measuring instrument.Achieve in sintering, tempering stage saving energy 380 kilowatt hour, the effect saved time 5 hours.
Embodiment 3
Apply domestic RVS-300G type single-chamber vacuum sintering furnace, batch 300 kilograms/stove.After sintering procedure terminates, be filled with nitrogen respectively, start cycles cooling blower, be cooled to the product temperature 300 DEG C of body of heater probe temperature lower than setting of sintering furnace; Material boat central temperature is higher than product temperature 30 DEG C, and material boat peripheral temperature is lower than product temperature 200 DEG C, and fast cool time is 18 minutes, stops cooling.Heating, is warming up to product temperature, after tempering terminates, is cooled to room temperature, comes out of the stove.Performance test is carried out, properties of product test result: qualified with AMT-4 magnetization characteristic automatic measuring instrument.Achieve sintering, tempering stage saving energy 300 kilowatt hour, energy-conservation account for sintering, tempering stage consume energy 15%, the effect saved time 4 hours.
Embodiment 4
Apply domestic RVS-300G type single-chamber vacuum sintering furnace, batch 300 kilograms/stove.After sintering procedure terminates, be filled with argon gas respectively, start cycles cooling blower, be cooled to the product temperature 300 DEG C of body of heater probe temperature lower than setting of sintering furnace; Material boat central temperature is higher than product temperature 30 DEG C, and material boat peripheral temperature is lower than product temperature 200 DEG C, and fast cool time is 18 minutes, stops cooling.Heating, is warming up to product temperature, after tempering terminates, is cooled to room temperature, comes out of the stove.Performance test is carried out, properties of product test result: qualified with AMT-4 magnetization characteristic automatic measuring instrument.Achieve sintering, tempering stage saving energy 300 kilowatt hour, energy-conservation account for sintering, tempering stage consume energy 15%, the effect saved time 4 hours.
It is to be understood that foregoing invention content and detailed description of the invention are intended to the practical application proving technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art in spirit of the present invention and principle, when doing various amendment, equivalent replace or improve.Protection scope of the present invention is as the criterion with appended claims.
Claims (6)
1. the sintering of a sintered Nd-Fe-B permanent magnetic material and tempering method, described sintering and tempering method comprise: after in sintering furnace, sintered Nd-Fe-B permanent magnetic material sintering process terminates, be filled with protective gas, cooled fast by circulating cooling blower fan, be cooled to the product temperature 10 ~ 500 DEG C of body of heater probe temperature lower than setting of sintering furnace, material boat central temperature is higher than product temperature 0 ~ 100 DEG C, material boat peripheral temperature is lower than product temperature 0 ~ 300 DEG C, fast cool time is 3-30 minute, stop rapid cooling, start heating, be warming up to temperature, enter tempering program.
2. sintering according to claim 1 and tempering method, is characterized in that, described sintering furnace is single chamber sintering furnace.
3. sintering according to claim 1 and tempering method, is characterized in that, described protective gas comprises argon gas, nitrogen.
4. sintering according to claim 1 and tempering method, is characterized in that, after stopping cooling, material boat, product and furnace body temperature are risen again rapidly, rises again in product temperature ± 200 DEG C of setting.
5. sintering according to claim 1 and tempering method, is characterized in that, in cooling procedure, has the gradient of material boat central temperature higher than peripheral temperature.
6. sintering according to claim 1 and tempering method, is characterized in that, body of heater heating process, has the gradient of material boat peripheral temperature higher than material boat central temperature.
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| CN201010520595.5A CN102451909B (en) | 2010-10-20 | 2010-10-20 | A kind of sintering of sintered Nd-Fe-B permanent magnetic material and tempering method |
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| CN102451909B true CN102451909B (en) | 2015-11-25 |
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| CN102976738A (en) * | 2012-12-20 | 2013-03-20 | 南通万宝磁石制造有限公司 | Process for manufacturing permanent magnetic ferrite with high compression strength |
| CN103121102B (en) * | 2013-02-05 | 2015-04-22 | 中铝广西有色金源稀土股份有限公司 | Sintering tempering method of neodymium iron boron magnetic materials |
| CN103121101B (en) * | 2013-02-05 | 2015-08-05 | 中铝广西有色金源稀土股份有限公司 | The technique of neodymium iron boron Even Sintering tempering |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035738A (en) * | 1988-01-05 | 1989-09-20 | 冶金工业部钢铁研究总院 | Method for producing superhuge anisotropy rare earth permanent magnet |
| CN2424433Y (en) * | 2000-05-14 | 2001-03-21 | 陈强 | High vacuum fritting furnace |
| CN101619381A (en) * | 2009-07-30 | 2010-01-06 | 浙江升华强磁材料有限公司 | Tempering method for sintering Nd-Fe-B permanent magnet |
| JP2013194260A (en) * | 2012-03-16 | 2013-09-30 | Tdk Corp | Method of producing rare earth sintered magnet |
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- 2010-10-20 CN CN201010520595.5A patent/CN102451909B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035738A (en) * | 1988-01-05 | 1989-09-20 | 冶金工业部钢铁研究总院 | Method for producing superhuge anisotropy rare earth permanent magnet |
| CN2424433Y (en) * | 2000-05-14 | 2001-03-21 | 陈强 | High vacuum fritting furnace |
| CN101619381A (en) * | 2009-07-30 | 2010-01-06 | 浙江升华强磁材料有限公司 | Tempering method for sintering Nd-Fe-B permanent magnet |
| JP2013194260A (en) * | 2012-03-16 | 2013-09-30 | Tdk Corp | Method of producing rare earth sintered magnet |
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