CN102451909A - Method for sintering and tempering sintered neodymium-iron-boron permanent-magnet material - Google Patents
Method for sintering and tempering sintered neodymium-iron-boron permanent-magnet material Download PDFInfo
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- CN102451909A CN102451909A CN2010105205955A CN201010520595A CN102451909A CN 102451909 A CN102451909 A CN 102451909A CN 2010105205955 A CN2010105205955 A CN 2010105205955A CN 201010520595 A CN201010520595 A CN 201010520595A CN 102451909 A CN102451909 A CN 102451909A
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Abstract
The invention provides a method for sintering and tempering a sintered neodymium-iron-boron permanent-magnet material. The sintering and tempering method comprises the following steps of: charging protective gas after the sintering process of the neodymium-iron-boron permanent-magnet material in a sintering furnace is finished; rapidly cooling through a circular cooling fan; cooling a material boat according to the material boat piling degree till the furnace body test temperature of the sintering furnace is 10-500 DEG C lower than the product tempering temperature, the central temperature of the material boat is 0-100 DEG C higher than the product tempering temperature, and the peripheral temperature of the material boat is 0-300 DEG C lower than the product tempering temperature; rapidly cooling for 3-30 minutes; and stopping rapidly cooling. The method has the characteristics of short fan cooling time and short time for heating to the tempering time, and the effect of saving energy and time is achieved.
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 industrialized development of International Modern, energy problem, global warming issue become increasingly conspicuous, and energy-saving and emission-reduction become the pressing issues that face in each national enterprise development.The rare earth resources of China is abundant, 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 the sintered NdFeB production process, electric power energy consumption is mainly in sintering, tempering stage.
Existing sintering, tempering process mainly are to be cooled to below 80 ℃ behind the material sintering; Come out of the stove and put again or do not come out of the stove, be warming up to temperature again and carry out tempering process, above-mentioned technical process is long cool time; It is slow that heating arrives the samming time, wasted time and electric power energy.
Summary of the invention
The present invention is just in order to overcome above-mentioned defective; Heat radiation, the conduction principle of sintering process have been utilized fully; And combine the self-characteristic of sintered Nd-Fe-B permanent magnetic material, in the sintering of sintered Nd-Fe-B permanent magnetic material, drawing process, accomplished that cool time short; Heating process arrives short characteristics of samming time, has realized energy-conservation, timesaving effect.
According to the present invention, a kind of sintering and tempering method of tying Nd-Fe-Bo permanent magnet material is provided, said sintering and tempering method comprise: after the sintered Nd-Fe-B permanent magnetic material sintering process in sintering furnace charge boat finishes; Charge into protective gas; Through the circulation cooling blower sintered Nd-Fe-B permanent magnetic material of material in the boat cooled off fast, when the body of heater probe temperature that is cooled to sintering furnace was lower than 10～500 ℃ of the product temperatures of setting, expected that the boat central temperature is higher than 0～100 ℃ of product temperature this moment; Material boat peripheral temperature is lower than 0～300 ℃ of product temperature; Fast cool time is 3-30 minute, stops coldly soon, begins heating; Be warming up to temperature, get into the tempering program.
Preferably, said sintering furnace is the single chamber sintering furnace.
Preferably, said protective gas comprises argon gas, nitrogen.
Preferably, stop cooling after, material boat, product and furnace body temperature are risen again rapidly, rise again to product temperature ± 200 of setting ℃.
Because the present invention is in cooling procedure, material boat central temperature is higher than the gradient (that is, the material boat is reduced by middle mind-set peripheral temperature gradually) of peripheral temperature; In body of heater heating process, material boat peripheral temperature is higher than the gradient of material boat central temperature and (that is, expects that boat is raise to central temperature by periphery gradually; Heat is transmitted to material boat center by material boat periphery); Therefore can realize arriving fast the effect of temperature, realize that the material boat is inside and outside to temperature evenly, fast, overcome in the conventional sintering stove heating process; The material boat center material that causes because of Gradient Effect arrives temperature slowly, for reaching the long difficult problem of material samming temperature retention time.The present invention has blower fan short, short characteristics of heating arrival temperature time cool time, has realized energy-conservation, timesaving effect.
The specific embodiment
In order further to understand structure of the present invention, characteristic and other purposes, combine appended preferred embodiment to specify as follows at present, illustrated preferred embodiment only is used to technical scheme of the present invention is described, and non-limiting the present invention.
Embodiment 1
MADE IN CHINA RVS-300G type single-chamber vacuum sintering furnace, 300 kilograms/stove of batch.After the sintering EP (end of program), charge into argon gas, start cycles cooling blower, the body of heater probe temperature that is cooled to sintering furnace are lower than 500 ℃ of the product temperatures of setting; Material boat central temperature is higher than 0 ℃ of product temperature, and material boat peripheral temperature is lower than 300 ℃ of product temperatures, and fast cool time is 30 minutes, stops cooling.Heating is warming up to the product temperature, and tempering is cooled to room temperature after finishing, and comes out of the stove.Carry out performance test with AMT-4 magnetization characteristic automatic measuring instrument, properties of product test result: qualified.Realized in sintering, energy-conservation about 240 kilowatt hours of tempering stage, the effect that saved time 3 hours.
Embodiment 2
MADE IN CHINA RVS-300G type single-chamber vacuum sintering furnace, 300 kilograms/stove of batch.After the sintering EP (end of program), charge into nitrogen, start cycles cooling blower, the body of heater probe temperature that is cooled to sintering furnace are lower than 10 ℃ of the product temperatures of setting; Material boat central temperature is higher than 100 ℃ of product temperatures, and material boat peripheral temperature is lower than 0 ℃ of product temperature, and fast cool time is 3 minutes, stops cooling.Heating is warming up to the product temperature, and tempering is cooled to room temperature after finishing, and comes out of the stove.Carry out performance test with AMT-4 magnetization characteristic automatic measuring instrument, properties of product test result: qualified.Realized in sintering, energy-conservation about 380 kilowatt hours of tempering stage, the effect that saved time 5 hours.
Embodiment 3
MADE IN CHINA RVS-300G type single-chamber vacuum sintering furnace, 300 kilograms/stove of batch.After the sintering EP (end of program), charge into nitrogen respectively, start cycles cooling blower, the body of heater probe temperature that is cooled to sintering furnace are lower than 300 ℃ of the product temperatures of setting; Material boat central temperature is higher than 30 ℃ of product temperatures, and material boat peripheral temperature is lower than 200 ℃ of product temperatures, and fast cool time is 18 minutes, stops cooling.Heating is warming up to the product temperature, and tempering is cooled to room temperature after finishing, and comes out of the stove.Carry out performance test with AMT-4 magnetization characteristic automatic measuring instrument, properties of product test result: qualified.Realized in sintering, energy-conservation about 300 kilowatt hours of tempering stage energy-conservation 15% of sintering, the power consumption of tempering stage, the effect that saved time 4 hours of accounting for.
Embodiment 4
MADE IN CHINA RVS-300G type single-chamber vacuum sintering furnace, 300 kilograms/stove of batch.After the sintering EP (end of program), charge into argon gas respectively, start cycles cooling blower, the body of heater probe temperature that is cooled to sintering furnace are lower than 300 ℃ of the product temperatures of setting; Material boat central temperature is higher than 30 ℃ of product temperatures, and material boat peripheral temperature is lower than 200 ℃ of product temperatures, and fast cool time is 18 minutes, stops cooling.Heating is warming up to the product temperature, and tempering is cooled to room temperature after finishing, and comes out of the stove.Carry out performance test with AMT-4 magnetization characteristic automatic measuring instrument, properties of product test result: qualified.Realized in sintering, energy-conservation about 300 kilowatt hours of tempering stage energy-conservation 15% of sintering, the power consumption of tempering stage, the effect that saved time 4 hours of accounting for.
What need statement is that the foregoing invention content and the specific embodiment are intended to prove the practical application of technical scheme provided by the present invention, should not be construed as the qualification to protection domain of the present invention.Those skilled in the art are in spirit of the present invention and principle, when doing various modifications, being equal to replacement or improvement.Protection scope of the present invention is as the criterion with appended claims.
Claims (6)
1. a sintering and tempering method of tying Nd-Fe-Bo permanent magnet material; Said sintering and tempering method comprise: after the sintered Nd-Fe-B permanent magnetic material sintering process finishes in sintering furnace; Charge into protective gas, cool off fast through the circulation cooling blower, the body of heater probe temperature that is cooled to sintering furnace is lower than 10～500 ℃ of the product temperatures of setting; Material boat central temperature is higher than 0～100 ℃ of product temperature; Material boat peripheral temperature is lower than 0～300 ℃ of product temperature, and fast cool time is 3-30 minute, stops cold soon.
2. sintering according to claim 1 and tempering method is characterized in that, said sintering furnace is the single chamber sintering furnace.
3. sintering according to claim 1 and tempering method is characterized in that said protective gas comprises argon gas, nitrogen.
4. sintering according to claim 1 and tempering method is characterized in that, stop cooling after, material boat, product and furnace body temperature are risen again rapidly, rise again to product temperature ± 200 of setting ℃.
5. sintering according to claim 1 and tempering method is characterized in that, in cooling procedure, have the gradient that material boat central temperature is 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 that material boat peripheral temperature is higher than material boat central temperature.
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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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| CN102451909A true CN102451909A (en) | 2012-05-16 |
| CN102451909B CN102451909B (en) | 2015-11-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103121101A (en) * | 2013-02-05 | 2013-05-29 | 中铝广西有色金源稀土股份有限公司 | Even sintering temper technology of neodymium iron boron |
| CN103121102A (en) * | 2013-02-05 | 2013-05-29 | 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 |
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| 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
- 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103121101A (en) * | 2013-02-05 | 2013-05-29 | 中铝广西有色金源稀土股份有限公司 | Even sintering temper technology of neodymium iron boron |
| CN103121102A (en) * | 2013-02-05 | 2013-05-29 | 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 |
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| CN102451909B (en) | 2015-11-25 |
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