CN104616880A - Method for producing sintered NdFeB magnets - Google Patents
Method for producing sintered NdFeB magnets Download PDFInfo
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- CN104616880A CN104616880A CN201310536214.6A CN201310536214A CN104616880A CN 104616880 A CN104616880 A CN 104616880A CN 201310536214 A CN201310536214 A CN 201310536214A CN 104616880 A CN104616880 A CN 104616880A
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Abstract
The invention provides a method for producing sintered NdFeB magnets. The method is carried out in a continuous sintering furnace which is provided with a preparation chamber, a dewaxing chamber, a degassing chamber, a first sintering chamber, a second sintering chamber, a third sintering chamber and a cooling chamber. The method comprises the first step of preparing, the second step of dewaxing conducted at the temperature ranging from 300 DEG C to 350 DEG C, the third step of degassing, the fourth step of presintering, the fifth step of sintering and the sixth step of cooling, wherein the duration time of dewaxing, the duration time of degassing, the duration time of presintering and the duration time of sintering are equal. After sintering is finished, first-level aging treatment is carried out in the third sintering chamber, and then cooling is carried out; if the sintering time of workblanks in the second sintering chamber is not enough, supplement sintering can be carried out in the third sintering chamber.
Description
Technical field
The invention provides a kind of method of producing Sintered NdFeB magnet, be specifically related to a kind of method utilizing continuous fritting furnace to produce sintered NdFeB.
Background technology
The sintering of Sintered NdFeB magnet carries out under vacuum condition, high temperature.When using single chamber sintering furnace, the material discharged in sintering process can reduce the vacuum degree of sintering furnace, and causes the pollution to sintering furnace, and then affects the quality of product.The hydrogen that degasification process discharges can corrode the joint of the thermocouple end in sintering furnace, causes thermocouple hydrogen embrittlement and ruptures, thus the quality of impact sintering blank.In addition, when using single chamber sintering furnace, repeat to heat up and cooling, cause energy loss comparatively large like this, the cost producing blank increases.During Long-Time Service, the uniformity of single chamber sintering furnace in-furnace temperature and consistency reduce, thus affect the consistency of magnet.
Japanese Patent Laid-Open 9-222282 and application number be 201220584986.8 Chinese utility model patent each provide a kind of continuous fritting furnace.Each room of continuous fritting furnace is the space of independent closed, and unaffected each other, between each room, temperature is relatively stable.Because the material transmission between each room of continuous fritting furnace is streamlined mode, the speed of production of each room needs beat consistent, rationally could reduce energy consumption.
When the temperature of the room that dewaxes is more than 400 DEG C, for the material batch that weight is larger, deflation time can be longer, even exceedes the time of sintering needs, thus cause the time beat that stops in agglomerating chamber with material inconsistent, and then be unfavorable for keeping the even of sintering in-furnace temperature.When carrying out the many temperature sections sintering of 850 ~ 1080 DEG C in an agglomerating chamber, because the range of temperature in agglomerating chamber is comparatively large, affect stablizing of sintering stage temperature in continuous seepage.In addition, in mass production process, in the high temperature sintering stage, material arrives design temperature from actual temperature and there is the lag period.
In addition, application number be 201220584986.8 Chinese utility model patent also relate to increase timeliness room.But when blank batch quantity is large, terminate rear blank and be usually cooled to less than 80 DEG C, and first order aging temp is 800 ~ 900 DEG C, arriving this temperature needs more than 1.5h.Second level aging temp is 450 ~ 550 DEG C, and dropping to this temperature after first order completion of prescription needs more than 2h, needs in addition at second level aging temp insulation 2 ~ 4h.Such material in time of staying of timeliness indoor more than 6h.This requires not mate in the time of staying of other rooms of continuous oven with material, causes material to need in other rooms to wait for that certain hour just can enter timeliness room.
In addition, in order to improve coercive force and the squareness of blank by the gross, need to cool fast after first order aging temp and the insulation of second level aging temp terminate.If carry out second level timeliness in same timeliness indoor, without the quick cooling procedure after first order timeliness, then likely affect the raising of properties of product.
Summary of the invention
In view of the above problems, the invention provides a kind of method of producing Sintered NdFeB magnet, carry out in continuous fritting furnace, the method can guarantee that material is equal in the time of staying of each indoor of continuous fritting furnace, beat is consistent, and owing to adding pre-sintered state, ensure that the stable of sintering phase temperature, thus improve the consistency of magnet performance.
The method of described production Sintered NdFeB magnet, carry out in the continuous fritting furnace being provided with preparation room, dewaxing room, degas chamber, the first agglomerating chamber, the second agglomerating chamber, the 3rd agglomerating chamber and cooling chamber, comprise the following steps:
1) prepare
When the vacuum degree of preparation room is higher than 2300Pa, start auto-programming, when vacuum degree is higher than 40Pa, inert gas or compressed air is filled with to preparation room, material enters described preparation room, when vacuum degree is higher than 30Pa, carries described material from described preparation room to dewaxing room;
2) dewax
After described material enters described dewaxing room, when vacuum degree is higher than 600Pa, heat temperature raising 0.5 hour, temperature reaches 300 ~ 350 DEG C, insulation; After insulation terminates when vacuum degree is higher than 70Pa, carry described material from described dewaxing room to degas chamber;
3) degassed
After described material enters described degas chamber, when vacuum degree is higher than 700Pa, heat up 0.5 hour, temperature reaches 700 ~ 820 DEG C, insulation, after insulation terminates when vacuum degree is higher than 30Pa, carries described material from described degas chamber to the first agglomerating chamber;
4) presintering
After described material enters described first agglomerating chamber, when vacuum degree is higher than 60Pa, heat up 5 ~ 10min, temperature reaches 700 ~ 820 DEG C, insulation 1h ~ 1h55min, then heats up 0.5 hour, now temperature is lower than sintering temperature 10 ~ 20 DEG C, insulation, after insulation terminates when vacuum degree is higher than 10Pa, carries described material from described first agglomerating chamber to the second agglomerating chamber;
5) sinter
After described material enters described second agglomerating chamber, when vacuum degree is higher than 60Pa, heat up 10 minutes, temperature reaches sintering temperature, insulation;
6) cool
After described material is transported into described cooling chamber, when vacuum degree is higher than 20Pa, is filled with inert gas, then cools to cooling chamber, cooling time is 2 ~ 3 hours, when vacuum degree is higher than 10Pa, is come out of the stove by material,
Wherein, dewax, time that degassed, presintering and sintering step continue is equal.
Preferably, the method of described production Sintered NdFeB magnet also comprises the step of first order timeliness, carry out in described 3rd agglomerating chamber, after described material delivers into described 3rd agglomerating chamber from described second agglomerating chamber, when the vacuum degree of described 3rd agglomerating chamber is higher than 60Pa, vacuum cool-down 2 hours, then heats up 0.5 hour, temperature reaches 800 ~ 950 DEG C, insulation.
Preferably, the method of described production Sintered NdFeB magnet also comprises the step of supplementing sintering, carry out in described 3rd agglomerating chamber, after described material delivers into described 3rd agglomerating chamber from described second agglomerating chamber, described 3rd agglomerating chamber intensification 10min, after temperature reaches described sintering temperature, insulation.
Accompanying drawing explanation
Fig. 1 is the organigram of seven Room continuous vacuum sintering furnaces used in embodiment.
Fig. 2 is the method flow diagram producing Sintered NdFeB magnet in embodiment.
Embodiment
Be described below in conjunction with the technical scheme of accompanying drawing to the specific embodiment of the invention.
In the present embodiment, sintering furnace used is seven Room continuous vacuum sintering furnaces (hereinafter referred to as sintering furnace), its structure as shown in Figure 1, is provided with prep stand 5, preparation room 8, dewaxing room 9, agglomerating chamber 12 of degas chamber 10, first agglomerating chamber 11, second, the 3rd agglomerating chamber 13, cooling chamber 14 and taking-out platform 15.
Blank material is piled up on prep stand 5.Dewaxing room 9 is provided with the dewaxing crucible 2 for dewaxing to blank material, is provided with heater between dewaxing room 9 and dewaxing crucible 2, and dewaxing crucible 2 is furnished with refrigerating plant 3.Preparation room 8, dewaxing room 9, agglomerating chamber 12 of degas chamber 10, first agglomerating chamber 11, second, the 3rd agglomerating chamber 13 and cooling chamber 14 are all provided with mechanical pump and lobe pump vacuum system, first agglomerating chamber 11 and the second agglomerating chamber 12 are also provided with diffusion pump, and diffusion pump is connected with refrigerating plant 3 to cool the oil vapour of diffusion pump.Cooling chamber 14 is provided with continuous frequency conversion formula air blast 4 for cooling material.Spaced apart by slide valve 7 between adjacent two rooms, material is carried between adjacent two rooms by roller 6.
Below the method for producing Sintered NdFeB magnet is described.
The weight of each batch of blank to be sintered is 200 ~ 350kg.
The time that blank to be sintered stops in dewaxing room 9, degas chamber 10, first agglomerating chamber 12 of agglomerating chamber 11, second and the 3rd agglomerating chamber 13 is equal, this time is set as pitch time (Takt time) T, pitch time T is 3 ~ 5h, and the rhythm that blank material can be kept to circulate along each room is like this consistent.
To each in preparation room 8, dewaxing room 9, agglomerating chamber 12 of degas chamber 10, first agglomerating chamber 11, second, the 3rd agglomerating chamber 13 and cooling chamber 14, set SET1, SET2 and SET3 value respectively.SET1 represents the minimum vacuum degree alarming value of each room, and when vacuum degree is lower than SET1 value, do not start auto-programming, the body of heater of each room corresponding does not heat, simultaneously alarm.SET2 represents that each room body of heater performs the minimum vacuum degree of automatic heating, and namely when vacuum degree is higher than SET2 value, the body of heater of each room corresponding starts to perform automatic heating, otherwise continues to vacuumize until vacuum degree is higher than SET2 value.SET3 represents that required minimum vacuum angle value opened automatically by the slide valve between adjacent two Room.It should be noted that, the SET2 value of preparation room 8 represents when vacuum degree is higher than SET2 value, automatically start to be filled with inert gas or compressed air in preparation room 8, and the SET2 value of cooling chamber 14 represents when vacuum degree is higher than SET2, automatically start to be filled with inert gas in cooling chamber 14, after inflation, air blast startup cools.
The setting parameter of each room is as shown in table 1 above.
Table 1
Above-mentioned SET1, SET2 and SET3 value is the minimum of technological requirement, and the vacuum degree higher than above-mentioned value is all adapted at continuous vacuum sintering furnace and produces, if low vacuum is in above-mentioned value, then blank has the risk of oxidation.
Concrete sintering process is as follows.
The first step, sintering furnace enters the preparation before automatically running.Vacuumize, when the vacuum degree of preparation room 8 is higher than 2300Pa, run auto-programming.When the vacuum degree of preparation room 8 is higher than 40Pa, is filled with inert gas or compressed air to preparation room 8, then mass transport is entered preparation room, close slide valve 7.When vacuum degree is higher than 30Pa, open the slide valve between preparation room 8 and dewaxing room 9, from preparation room 8 to dewaxing room 9 convey materials.
Second step, dewaxing.Material closes slide valve after entering dewaxing room 9.Then vacuumize, when vacuum degree is higher than 600Pa, start heat temperature raising, intensification 0.5h, temperature reaches 300 ~ 350 DEG C, insulation.When vacuum degree is higher than 70Pa, the slide valve 3 between dewaxing room 9 and degas chamber 10 is opened, from dewaxing room 9 to degas chamber 10 convey materials.
3rd step, degassed.After material enters degas chamber 10, close slide valve, then start heat temperature raising, heating-up time 0.5h, temperature rises to 700 ~ 820 DEG C, insulation.Now, the material carrying next batch from preparation room 8 to dewaxing room 9 can be started.After insulation terminates, if vacuum degree is higher than 30Pa, then open the slide valve between degas chamber 10 and the first agglomerating chamber 11, from degas chamber 10 to the first agglomerating chamber 11 convey materials.
4th step, presintering.After material enters the first agglomerating chamber 11, close slide valve.When vacuum degree is higher than 60Pa, start to heat the first agglomerating chamber 11, heat up 5 ~ 10min, and temperature rises to 700 ~ 820 DEG C, insulation 1h ~ 1h55min.Continue heating, intensification 0.5h, when temperature reaches lower than sintering temperature 10 ~ 20 DEG C, insulation.After insulation terminates, when vacuum degree is higher than 10Pa, open the slide valve between the first agglomerating chamber 11 and the second agglomerating chamber 12, from the first agglomerating chamber 11 to the second agglomerating chamber 12 convey materials.
5th step, sintering.After material enters the second agglomerating chamber 12, close slide valve.Then heat temperature raising, intensification 10min, temperature rises to the temperature (that is, sintering temperature) needed for sintering, insulation.Sintering temperature adjusts according to the difference of the formula of slug press, melting steel ingot technology, crushing process, abrasive dust granularity and blank control oxygen amount, and temperature range is 1040 ~ 1100 DEG C.Therefore need, according to different sintering temperatures, to set different sintering temperature curve, be input in the control program of sintering furnace, carry out the sintering of satisfied different blank.When vacuum degree is higher than 10Pa, open the slide valve between the second agglomerating chamber 12 and the 3rd agglomerating chamber 13, from the second agglomerating chamber 12 to the 3rd agglomerating chamber 13 convey materials.
6th step, first order timeliness, carries out in the 3rd agglomerating chamber 13.After material enters the 3rd agglomerating chamber 13, close slide valve.Then vacuum cool-down 2h, next heat up 0.5h, and temperature reaches 800 ~ 950 DEG C, is then incubated.When vacuum degree is higher than 30Pa, open the slide valve between the 3rd agglomerating chamber 13 and cooling chamber 14, from the 3rd agglomerating chamber 13 to cooling chamber 14 convey materials.
7th step, cooling.After material enters cooling chamber 14, close slide valve.When vacuum degree is higher than 20Pa, be filled with inert gas to cooling chamber 14, inflation terminates the startup of rear air blast and cools, cooling 2 ~ 3h.When vacuum degree is higher than 10Pa, opens the slide valve of cooling chamber 14, come out of the stove by material, blank tapping temperature is lower than 60 DEG C.
The second level timeliness of blank is carried out in independently one-way fired furnace after cooling is come out of the stove, one-way fired furnace is made to run a low-temperature zone for a long time like this, the all even consistency of temperature when ensure that the material of different batches carries out second level timeliness, thus keep the magnetic property of product to have good consistency, and the useful life of one-way fired furnace can be extended.
3rd agglomerating chamber 13, as the timeliness room of first order aging temp, can save the heating-up time, reduces energy consumption.
In addition, the 3rd agglomerating chamber 13 can also be used for supplementing sintering, carries out further closely knit sintering to blank.After the sintering of the second agglomerating chamber 12 terminates, if blank does not reach required density, can carry out supplementing sintering in the 3rd agglomerating chamber 13, temperature is identical with aforementioned sintering temperature, intensification 10min, temperature retention time increases according to actual needs, but the time increased will lower than pitch time T.After insulation terminates, automatically carry out vacuum cool-down, then mass transport is entered cooling chamber 14 and cool rapidly.
In multiple batches of quantity-produced situations, when the material in preparation room 8 enters in dewaxing room 9, the material of next batch can be placed on prep stand and carry out pan feeding preparation, but the pan feeding time interval of front and back two batches is maximum is no more than 2 times of pitch time T, namely the latest time of pan feeding is before last batches in dewaxing room 9 enters degas chamber 10.
If dewaxing room 9 temperature is set in more than 400 DEG C, the venting in dewaxing process will be caused violent, and in 3 ~ 5h, vacuum degree is difficult to reach required condition of high vacuum degree, thus causes material at dewaxing room 9 overstand, affects the beat of production procedure.And the temperature that said method is dewaxed by conservative control and SET2, SET3 value, ensure that the beat of whole flow process is unified, also can guarantee the performance sintering blank simultaneously.And material is fixing consistent in each room time of staying, flow beat is produced, and saves energy consumption and improves the efficiency and uniformity that blank produces.
According to said method, the variations in temperature of each indoor is little, relatively stable.In addition, pre-sintered state is added in the first agglomerating chamber 11, thus the lag period existed between the actual temperature of blank material and the sintering temperature of setting when compensate for mass production, make the actual temperature of the blank to be sintered entered in the second agglomerating chamber 12 differ less with the furnace temperature of the second agglomerating chamber 12, be conducive to blank like this and sinter all unanimously even.
embodiment 1
Pitch time T is set as 3h.
By single batch weight be 200k g, pre-performance is the formulated raw material of N44H; raw material obtain thin slice steel ingot through belt-rejecting technology; HD process carries out fragmentation; airflow milling abrasive dust; blank crude green body is formed through orientation compacting under inert gas shielding; blank crude green body is put into magazine, is filled with inert gas and carries out seal protection.
Next, blank is sintered.
First, the parameter of setting each room of sintering furnace, specifically as shown in table 2.
Table 2
First, start sintering furnace, enter the preparation automatically run, the vacuum system of each room vacuumizes, and vacuum degree reaches the requirement of SET3 and enters automatic running status after meeting other automatic service conditionss.
Next, the magazine (hereinafter referred to as material) that blank is housed is placed on prep stand, performs the program automatically run.Now in preparation room 8, be filled with N
2after balancing with ambient pressure, slide valve between prep stand and preparation room 8 is opened, material is transported to preparation room 8 by roller, then close slide valve, vacuumize, when vacuum degree is higher than SET3 value (30Pa), open the slide valve between preparation room 8 and dewaxing room 9, from preparation room 8 to dewaxing room 9 convey materials.
Material closes slide valve after entering dewaxing room 9.Then vacuumize, vacuum degree starts heat temperature raising, intensification 0.5h higher than time SET2 (600Pa), and temperature reaches 300 DEG C, is then incubated 2.5h.So just complete the dewaxing to blank.When the vacuum degree in dewaxing room 9 reaches 15Pa, time namely higher than SET3 value (30Pa), open the slide valve 3 between dewaxing room 9 and degas chamber 10, from dewaxing room 9 to degas chamber 10 convey materials.
After material enters degas chamber 10, close slide valve.Then start heat temperature raising, intensification 0.5h, temperature reaches 700 DEG C, is next incubated 2.5h.Now, the blank material carrying second batch from preparation room 8 to dewaxing room 9 can be started.Material is after degas chamber 10 is incubated 2.5h, and the vacuum degree of degas chamber 10 is 10Pa, time namely higher than SET3 value (30Pa), opens the slide valve between degas chamber 10 and the first agglomerating chamber 11, from degas chamber 10 to the first agglomerating chamber 11 convey materials.
After material enters the first agglomerating chamber 11, close slide valve.Then start heat temperature raising, intensification 5min, temperature reaches 700 DEG C, insulation 1h.Next be presintering, heat temperature raising 0.5h, temperature reaches 1040 DEG C (lower than sintering temperature 10 DEG C), insulation 1.5h.After said procedure terminates, the vacuum degree of the first agglomerating chamber 11 reaches 1Pa, time namely higher than SET3 value (30Pa), opens the slide valve between the first agglomerating chamber 11 and the second agglomerating chamber 12, from the first agglomerating chamber 11 to the second agglomerating chamber 12 convey materials.
After material enters the second agglomerating chamber 12, close slide valve.In the second agglomerating chamber 12, carry out crucial high temperature sintering to blank, heat temperature raising 10min, temperature reaches 1050 DEG C, is then incubated 2h50min.After insulation terminates, the vacuum degree of the second agglomerating chamber 12 reaches 5X10
-3pa, namely higher than SET3 value (30Pa), now opens the slide valve between the second agglomerating chamber 12 and the 3rd agglomerating chamber 13, from the second agglomerating chamber 12 to the 3rd agglomerating chamber 13 convey materials.
After material enters the 3rd agglomerating chamber 13, close slide valve.3rd agglomerating chamber 13 is as the first aging temp room.First, to the 3rd agglomerating chamber 13 vacuum cool-down 2h, then heat up 0.5h, and temperature reaches 800 DEG C, is then incubated 0.5h.Insulation terminates the slide valve of rear unlatching the 3rd agglomerating chamber 13 and cooling chamber 14, from the 3rd agglomerating chamber 13 to cooling chamber 14 convey materials.
At cooling chamber 14, come out of the stove after cooling material 2h.
In whole sintering process, the time of staying of material in dewaxing room 9, degas chamber 10, first agglomerating chamber 12 of agglomerating chamber 11, second and the 3rd agglomerating chamber 13 is all 3h.Whole sintering process is smooth, warning of not breaking down.After material is come out of the stove, check that the outward appearance of blank does not find oxidation.Inspect by random samples the density of the blank in all magazines, result is 7.58 ~ 7.61g/cm
3, show that the consistency sintering blank is good.
embodiment 2
Setting pitch time T is 4h.
By single batch weight be 300kg, pre-performance is the formulated raw material of N45SH; raw material obtain thin slice steel ingot through belt-rejecting technology; HD process is broken; airflow milling abrasive dust; blank crude green body is formed through orientation compacting under inert gas shielding; then blank crude green body is put into magazine, be filled with inert gas seal protection.
Next, blank is sintered.
First, the parameter of setting each room of sintering furnace, specifically as shown in table 3.
Table 3
Sintering process is identical with embodiment 1.
In whole implementation process, the time of staying of material in dewaxing room 9, degas chamber 10, first agglomerating chamber 12 of agglomerating chamber 11, second and the 3rd agglomerating chamber 13 is all 4h, and whole sintering process is smooth, warning of not breaking down.Material checks after coming out of the stove that outward appearance does not find oxidation, and inspect by random samples the density of the material in all magazines, Examined is 7.59 ~ 7.61g/cm
3, show that the blank consistency sintered is good.
embodiment 3
Setting pitch time T is 5h.
By single batch weight be 350kg, pre-performance is the formulated raw material of N45SH; raw material obtain thin slice steel ingot through belt-rejecting technology; HD process carries out fragmentation; airflow milling abrasive dust; blank crude green body is formed through orientation compacting under inert gas shielding; blank crude green body is put into magazine, is filled with inert gas seal protection.
Next, blank is sintered.
First, the parameter of setting each room of sintering furnace, specifically as shown in table 4.
Table 4
Sintering process is identical with embodiment 1.
In whole implementation process, the time of staying of material in dewaxing room 9, degas chamber 10, first agglomerating chamber 12 of agglomerating chamber 11, second and the 3rd agglomerating chamber 13 is all 5h, and whole sintering process is smooth, warning of not breaking down.Material checks after coming out of the stove that outward appearance does not find oxidation.Inspect by random samples the density of the material in all magazines, Examined is 7.59 ~ 7.61g/cm
3, show that the consistency sintering blank is good.
embodiment 4
Setting pitch time T is 4h.
By single batch weight be 300kg, pre-performance is the formulated raw material of N48H; raw material obtain thin slice steel ingot through belt-rejecting technology, and HD process carries out fragmentation, airflow milling abrasive dust; under inert gas shielding, put into magazine through orientation slug press crude green body, and be filled with inert gas seal protection.
Next, blank is sintered.
First, the parameter of setting each room of sintering furnace, specifically as shown in table 5.
Table 5
In the present embodiment, except carrying out supplementing except sintering in the 3rd agglomerating chamber 13, other steps are identical with embodiment 1.
In whole implementation process, material is all 4h in the time of staying of dewaxing room 9, degas chamber 10, first agglomerating chamber 11 and the second agglomerating chamber 12, and whole sintering process is smooth, warning of not breaking down.Material is come out of the stove and is checked that outward appearance does not find oxidation.Inspect by random samples the density of the material in all magazines, Examined is 7.54 ~ 7.57g/cm
3, show that the consistency of sintering furnace sintering blank is good.
More than describe technical scheme of the present invention in detail in conjunction with embodiment and embodiment, but the present invention is not limited to this.Under the prerequisite realizing the object of the invention, those skilled in the art can make various change and distortion to the present invention.
Claims (3)
1. produce a method for Sintered NdFeB magnet, carry out in the continuous fritting furnace being provided with preparation room, dewaxing room, degas chamber, the first agglomerating chamber, the second agglomerating chamber, the 3rd agglomerating chamber and cooling chamber, comprise the following steps:
1) prepare
When the vacuum degree of preparation room is higher than 40Pa, be filled with inert gas or compressed air, material enters described preparation room, when vacuum degree is higher than 30Pa, carries described material from described preparation room to described dewaxing room;
2) dewax
After described material enters described dewaxing room, when vacuum degree is higher than 600Pa, heat temperature raising 0.5 hour, temperature reaches 300 ~ 350 DEG C, insulation, after insulation terminates when vacuum degree is higher than 70Pa, carries described material from described dewaxing room to described degas chamber;
3) degassed
After described material enters described degas chamber, when vacuum degree is higher than 700Pa, heat up 0.5 hour, temperature reaches 700 ~ 820 DEG C, insulation, after insulation terminates when vacuum degree is higher than 30Pa, carries described material from described degas chamber to described first agglomerating chamber;
4) presintering
After described material enters described first agglomerating chamber, when vacuum degree is higher than 60Pa, heat up 5 ~ 10min, temperature reaches 700 ~ 820 DEG C, insulation 1h ~ 1h55min, then heats up 0.5 hour, now temperature is lower than sintering temperature 10 ~ 20 DEG C, insulation, after insulation terminates when vacuum degree is higher than 10Pa, carries described material from described first agglomerating chamber to described second agglomerating chamber;
5) sinter
After described material enters described second agglomerating chamber, when vacuum degree is higher than 60Pa, heat up 10 minutes, temperature reaches described sintering temperature, insulation;
6) cool
After described material is transported into described cooling chamber, when vacuum degree is higher than 20Pa, is filled with inert gas, then cools to cooling chamber, cooling time is 2 ~ 3 hours, when vacuum degree is higher than 10Pa, is come out of the stove by described material,
Wherein, dewax, time that degassed, presintering and sintering step continue is equal.
2. the method for production Sintered NdFeB magnet according to claim 1, it is characterized in that, also comprise the step of first order timeliness, carry out in described 3rd agglomerating chamber, after described material delivers into described 3rd agglomerating chamber from described second agglomerating chamber, when the vacuum degree of described 3rd agglomerating chamber is higher than 60Pa, vacuum cool-down 2 hours, then heat up 0.5 hour, temperature reaches 800 ~ 950 DEG C, insulation.
3. the method for production Sintered NdFeB magnet according to claim 1, it is characterized in that, also comprise the step of supplementing sintering, carry out in described 3rd agglomerating chamber, after described material delivers into described 3rd agglomerating chamber from described second agglomerating chamber, intensification 10min, after temperature reaches described sintering temperature, insulation.
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| CN106802078A (en) * | 2017-01-03 | 2017-06-06 | 新冶高科技集团有限公司 | A kind of neodymium iron boron high vacuum pressure sintering furnace |
| CN108376607A (en) * | 2017-12-31 | 2018-08-07 | 江西荧光磁业有限公司 | A kind of preparation method reducing heavy rare earth sintered NdFeB |
| CN108637249A (en) * | 2018-06-06 | 2018-10-12 | 山西大缙华磁性材料有限公司 | A kind of neodymium iron boron magnetic body sintering process |
| CN110534278A (en) * | 2019-08-15 | 2019-12-03 | 宁波爱维森材料研发科技有限公司 | A kind of sintering method of sintered Nd-Fe-B permanent magnetic material |
| CN117146580A (en) * | 2023-11-01 | 2023-12-01 | 沈阳广泰真空科技股份有限公司 | Eight-chamber vacuum continuous sintering furnace control method and eight-chamber vacuum continuous sintering furnace |
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| CN106802078A (en) * | 2017-01-03 | 2017-06-06 | 新冶高科技集团有限公司 | A kind of neodymium iron boron high vacuum pressure sintering furnace |
| CN108376607A (en) * | 2017-12-31 | 2018-08-07 | 江西荧光磁业有限公司 | A kind of preparation method reducing heavy rare earth sintered NdFeB |
| CN108637249A (en) * | 2018-06-06 | 2018-10-12 | 山西大缙华磁性材料有限公司 | A kind of neodymium iron boron magnetic body sintering process |
| CN110534278A (en) * | 2019-08-15 | 2019-12-03 | 宁波爱维森材料研发科技有限公司 | A kind of sintering method of sintered Nd-Fe-B permanent magnetic material |
| CN117146580A (en) * | 2023-11-01 | 2023-12-01 | 沈阳广泰真空科技股份有限公司 | Eight-chamber vacuum continuous sintering furnace control method and eight-chamber vacuum continuous sintering furnace |
| CN117146580B (en) * | 2023-11-01 | 2023-12-29 | 沈阳广泰真空科技股份有限公司 | Eight-chamber vacuum continuous sintering furnace control method and eight-chamber vacuum continuous sintering furnace |
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