WO2021062655A1 - 一种新型钕铁硼的烧结用真空烧结炉 - Google Patents

一种新型钕铁硼的烧结用真空烧结炉 Download PDF

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WO2021062655A1
WO2021062655A1 PCT/CN2019/109501 CN2019109501W WO2021062655A1 WO 2021062655 A1 WO2021062655 A1 WO 2021062655A1 CN 2019109501 W CN2019109501 W CN 2019109501W WO 2021062655 A1 WO2021062655 A1 WO 2021062655A1
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furnace
vacuum
sintering
furnace body
wall
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PCT/CN2019/109501
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English (en)
French (fr)
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朱明�
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江西荧光磁业有限公司
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Priority to PCT/CN2019/109501 priority Critical patent/WO2021062655A1/zh
Publication of WO2021062655A1 publication Critical patent/WO2021062655A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein

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  • the invention belongs to the technical field of high-temperature sintering, and particularly relates to a novel vacuum sintering furnace for sintering neodymium iron boron.
  • NdFeB magnets are widely used in modern industry and electronic technology due to their extremely high magnetic energy product, coercivity and high energy density. NdFeB magnets are usually manufactured by powder metallurgy, which generally includes batching, alloy smelting, hydrogen smashing, powder making, magnetic field orientation, molding, isostatic pressing, high temperature sintering, aging treatment and later machining, surface treatment and other processes.
  • high-temperature sintering requires heating the NdFeB magnet to a higher temperature. If sintering under vacuum conditions, there will be no reaction between metal and gas, and there will be no effect of adsorbed gas. Not only does it have a good densification effect, but also can play a role in purification and purification. Reduction effect, lower sintering temperature, and room temperature sintering ratio can be reduced by 100 degrees to 150 degrees, save energy consumption, improve the life of the sintering furnace and obtain high-quality neodymium iron boron magnets.
  • the present invention provides a novel neodymium iron boron sintering vacuum sintering furnace to solve the problems of low sintering efficiency and high energy consumption in the existing sintering furnace.
  • a new type of vacuum sintering furnace for neodymium iron boron sintering including intermediate frequency power supply, vacuum pump, wiring tube, vacuum tube, furnace body, base, furnace cover, thermometer, water inlet pipe, water pump, water outlet pipe and reservoir.
  • the intermediate frequency power supply is connected to the furnace body through a wiring tube;
  • the vacuum pump is arranged on one side of the intermediate frequency power supply, and the vacuum pump is connected to the furnace body through a vacuum tube;
  • the wiring tube is arranged on the upper side of the vacuum tube;
  • the furnace The body is placed above the base;
  • the furnace cover is installed on the upper part of the furnace body, and one side of the furnace cover is fixed with a thermometer;
  • one end of the water inlet pipe is fixed on one side of the furnace body, and the inlet The other end of the water pipe is connected to a reservoir through a water pump;
  • the water outlet pipe is arranged below the water inlet pipe, and the water outlet pipe is connected with the furnace body and the reservoir;
  • the furnace body includes a crucible, a heat insulation plate, a magnetic induction coil and a furnace wall.
  • the crucible is fixed on the upper end of the heat insulation plate in the furnace body; the magnetic induction coil is wound on the outside of the crucible, and the magnetic induction coil The two ends of the coil penetrate the furnace wall into the wiring tube.
  • the furnace wall includes an inner wall, a cooling water circulation zone and an outer wall, the inner wall is arranged on the inner side of the furnace wall; the cooling water circulation zone is arranged between the inner wall and the outer wall.
  • the vacuum pump adopts a bipolar rotary vane vacuum pump, which is connected to the inside of the furnace body through a vacuum tube, which facilitates the extraction of gas in the furnace body, maintains a high vacuum in the furnace body, and helps reduce the need for sintering neodymium iron boron magnets.
  • the highest temperature reduces energy consumption.
  • the water pump adopts a horizontal centrifugal pump, which is arranged on one side of the reservoir, and has good stability.
  • the cooling water in the reservoir can be sent into the water inlet pipe, which is beneficial for maintaining the stability of the cooling system and prolonging the service life.
  • the said heat insulation board adopts a rectangular vacuum heat insulation board, which is fixed between the bottom of the furnace body and the crucible to prevent the crucible in high temperature from directly contacting the bottom of the furnace body, damaging the furnace body, causing equipment failure, and ensuring the operation of the vacuum sintering furnace. Safe to use.
  • the cooling water circulation zone is arranged inside the furnace wall, between the inner wall and the outer wall, and the cooling water circulation zone is respectively connected with a water inlet pipe and a water outlet pipe, so as to facilitate the cooling water in the reservoir to complete the circulation in the cooling water circulation zone , Reduce the heat emitted to the outside of the furnace body when the NdFeB magnet is sintered, and protect the safety of workers.
  • the present invention has the following beneficial effects:
  • the setting of the vacuum pump of the present invention facilitates the extraction of gas in the furnace body, maintains a relatively high vacuum in the furnace body, and helps to reduce the maximum temperature required for the sintering of neodymium iron boron magnets and reduce energy consumption.
  • the arrangement of the present invention can send the cooling water in the reservoir into the water inlet pipe, which is beneficial to maintaining the stability of the cooling system and prolonging the service life.
  • the installation of the heat insulation board of the present invention prevents the crucible in high temperature from directly contacting the bottom of the furnace body, damaging the furnace body, causing equipment failure, and ensuring the safe use of the vacuum sintering furnace.
  • Fig. 1 is a schematic diagram of the main structure of the present invention.
  • Figure 2 is a schematic diagram of the furnace body structure of the present invention.
  • Fig. 3 is a schematic diagram of the enlarged structure of A-A of the present invention.
  • 1-intermediate frequency power supply 2-vacuum pump, 3-wiring tube, 4-vacuum tube, 5-furnace body, 51-crucible, 52-heat shield, 53-magnetic induction coil, 54-furnace wall, 541-inner wall, 542- Cooling water circulation area, 543-outer wall, 6-base, 7-furnace cover, 8-thermometer, 9-inlet pipe, 10-pump, 11-outlet pipe, 12-reservoir.
  • the invention provides a novel neodymium iron boron sintering vacuum sintering furnace, which includes an intermediate frequency power supply 1, a vacuum pump 2, a wiring tube 3, a vacuum tube 4, a furnace body 5, a base 6, a furnace cover 7, a thermometer 8, and a water inlet pipe 9.
  • the water pump 10, the water outlet pipe 11 and the reservoir 12, the intermediate frequency power supply 1 is connected to the furnace body 5 through the wiring tube 3;
  • the vacuum pump 2 is arranged on one side of the intermediate frequency power supply 1, and the vacuum pump 2 passes through the vacuum tube 4 is connected to the furnace body 5;
  • the wiring tube 3 is arranged on the upper side of the vacuum tube 4;
  • the furnace body 5 is placed above the base 6;
  • the furnace cover 7 is installed on the upper part of the furnace body 5, and
  • a thermometer 8 is fixed on one side of the furnace cover 7;
  • one end of the water inlet pipe 9 is fixed on one side of the furnace body 5, and the other end of the water inlet pipe 9 is connected to a reservoir 12 through a water pump 10;
  • the outlet pipe 11 is arranged below the inlet pipe 9, and the outlet pipe 11 is connected with the furnace body 5 and the reservoir 12;
  • the furnace body 5 includes a crucible 51, a heat insulation plate 52, a magnetic induction coil 53 and a furnace wall 54.
  • the crucible 51 is fixed on the upper end of the heat insulation plate 52 in the furnace body 5; the magnetic induction coil 53 is wound around It is outside the crucible 51, and the two ends of the magnetic induction coil 53 penetrate the furnace wall 54 and enter the wiring tube 3.
  • the furnace wall 54 includes an inner wall 541, a cooling water circulation zone 542 and an outer wall 543.
  • the inner wall 541 is arranged inside the furnace wall 54; the cooling water circulation zone 542 is arranged between the inner wall 541 and the outer wall 543.
  • the vacuum pump 2 adopts a bipolar rotary vane vacuum pump, which is connected to the inside of the furnace body 5 through a vacuum tube 4, which facilitates the extraction of gas in the furnace body 5 and maintains a high vacuum in the furnace body 5, which is beneficial to reduce neodymium.
  • the water pump 10 adopts a horizontal centrifugal pump, which is arranged on one side of the reservoir 12, and has good stability.
  • the cooling water in the reservoir 12 can be sent into the water inlet pipe 9, which is beneficial to the stability and extension of the cooling system. Service life.
  • the heat insulation board 52 adopts a rectangular vacuum heat insulation board and is fixed between the bottom of the furnace body 5 and the crucible 51 to prevent the crucible 51 in high temperature from directly contacting the bottom of the furnace body 5, damaging the furnace body, and causing equipment failure. Ensure the safe use of the vacuum sintering furnace.
  • the cooling water circulation zone 542 is arranged inside the furnace wall 54 between the inner wall 541 and the outer wall 543, and the cooling water circulation zone 542 is connected to the inlet pipe 9 and the outlet pipe 11, respectively, so as to facilitate the cooling of the reservoir 12
  • the water completes the circulation in the cooling water circulation zone 542, which reduces the heat radiated to the outside of the furnace body when the NdFeB magnet is sintered, and protects the safety of workers.
  • the user turns on the water pump 10 and the vacuum pump 2, so that the water in the reservoir 12 enters the cooling water circulation area 542 through the inlet pipe 9, and then returns to the reservoir 12 through the outlet pipe 11 to complete the cycle.
  • the vacuum pump 2 The air in the furnace body 5 is evacuated to form a vacuum, and then the intermediate frequency power supply 1 is turned on, and the magnetic induction coil 53 is energized to obtain an induced current and generate a large amount of heat to sinter the neodymium iron boron magnet in the crucible 51.

Abstract

一种新型钕铁硼的烧结用真空烧结炉，包括中频电源（1），真空泵（2），接线管（3），真空管（4），炉体（5），底座（6），炉盖（7），测温仪（8），进水管（9），水泵（10），出水管（11）和蓄水池（12），所述的中频电源（1）通过接线管（3）连接有炉体（5）；所述的真空泵（2）设置在中频电源（1）的一侧，且所述真空泵（2）通过真空管（4）连接有炉体（5）；所述的炉体（5）包括坩埚（51），隔热板（52），磁感线圈（53）和炉壁（54），所述的坩埚（51）固定在炉体（5）内隔热板（52）的上端。真空泵（2），水泵（10）和隔热板（52）的设置，结构简单，便于降低钕铁硼磁体烧结所需的最高温度，降低能耗，便于市场推广和应用。

Description

一种新型钕铁硼的烧结用真空烧结炉 技术领域
本发明属于高温烧结技术领域，尤其涉及一种新型钕铁硼的烧结用真空烧结炉。
背景技术
钕铁硼磁体因具有极高的磁能积，矫顽力和高能量密度，在现代工业和电子技术中获得极为广泛的应用。钕铁硼磁体通常采用粉末冶金工艺制造，一般包括配料，合金熔炼，氢碎，制粉，磁场取向，成型，等静压，高温烧结，时效处理和后期的机械加工、表面处理等工序。
其中高温烧结需要加热钕铁硼磁体到较高的温度，如果在真空条件下烧结，将不存在金属与气体间的反应，也没有吸附气体影响，不仅致密化效果好，而且可以起到净化和还原作用，降低烧结温度，和常温烧结比可降低100度至150度，节省能耗，提高烧结炉寿命和获得高质量的钕铁硼磁体。
因此，发明一种新型钕铁硼的烧结用真空烧结炉显得非常必要。
发明内容
为了解决上述技术问题，本发明提供一种新型钕铁硼的烧结用真空烧结炉，以解决现有烧结炉存在着烧结效率低，且能耗大的问题。一种新型钕铁硼的烧结用真空烧结炉，包括中频电源，真空泵，接线管，真空管，炉体，底座，炉盖，测温仪，进水管，水泵，出水管和蓄水池，所述的中频电源通过接线管连接有炉体；所述的真空泵设置在中频电源的一侧，且所述真空泵通过真空管连接有炉体；所述的接线管设置在真空管的上侧；所述的炉体放置在底座的上方；所述的炉盖安装在炉体的上部，且所述炉盖的一侧固定有测温仪；所述的进水管的一端固定在炉体的一侧，且进水管的另一端通过水泵连接有蓄水池；所述的出水管设置在进水管的下方，且所述的出水管连接有炉体和蓄水池；
所述的炉体包括坩埚，隔热板，磁感线圈和炉壁，所述的坩埚固定在炉体内隔热板的上端；所述的磁感线圈缠绕在坩埚的外侧，且所述磁感线圈的两端 穿过炉壁进入接线管。
所述的炉壁包括内壁，冷却水循环区和外壁，所述的内壁设置在炉壁的内侧；所述的冷却水循环区设置在内壁和外壁之间。
所述的真空泵采用双极旋片式真空泵，通过真空管连接至炉体的内部，便于抽除炉体内的气体，使炉体内保持较高的真空度，有利于降低钕铁硼磁体烧结所需的最高温度，降低能耗。
所述的水泵采用卧式离心泵，设置在蓄水池的一侧，稳定性较好，可以将蓄水池内的冷却水送入进水管，有利于冷却系统保持稳定，延长使用寿命。
所述的隔热板采用长方形结构的真空隔热板，固定在炉体底部与坩埚之间，避免高温中的坩埚直接接触炉体的底部，损坏炉体，引起设备故障，保证真空烧结炉的使用安全。
所述的冷却水循环区设置在炉壁的内部，内壁和外壁之间，且所述的冷却水循环区分别连接有进水管和出水管，从而便于蓄水池内的冷却水在冷却水循环区内完成循环，减少钕铁硼磁体烧结时向炉体外部散发的热量，保护工作人员安全。
与现有技术相比，本发明具有如下有益效果：
1.本发明真空泵的设置，便于抽除炉体内的气体，使炉体内保持较高的真空度，有利于降低钕铁硼磁体烧结所需的最高温度，降低能耗。
2.本发明的的设置，可以将蓄水池内的冷却水送入进水管，有利于冷却系统保持稳定，延长使用寿命。
3.本发明的隔热板的设置，避免高温中的坩埚直接接触炉体的底部，损坏炉体，引起设备故障，保证真空烧结炉的使用安全。
附图说明
图1是本发明的主体结构示意图。
图2是本发明的炉体结构示意图。
图3是本发明的A-A放大结构示意图。
图中：
1-中频电源，2-真空泵，3-接线管，4-真空管，5-炉体，51-坩埚，52-隔热板，53-磁感线圈，54-炉壁，541-内壁，542-冷却水循环区，543-外壁，6-底座，7-炉盖，8-测温仪，9-进水管，10-水泵，11-出水管，12-蓄水池。
具体实施方式
以下结合附图对本发明做进一步描述：
实施例：
如附图1至附图3所示
本发明提供一种新型钕铁硼的烧结用真空烧结炉，包括中频电源1，真空泵2，接线管3，真空管4，炉体5，底座6，炉盖7，测温仪8，进水管9，水泵10，出水管11和蓄水池12，所述的中频电源1通过接线管3连接有炉体5；所述的真空泵2设置在中频电源1的一侧，且所述真空泵2通过真空管4连接有炉体5；所述的接线管3设置在真空管4的上侧；所述的炉体5放置在底座6的上方；所述的炉盖7安装在炉体5的上部，且所述炉盖7的一侧固定有测温仪8；所述的进水管9的一端固定在炉体5的一侧，且进水管9的另一端通过水泵10连接有蓄水池12；所述的出水管11设置在进水管9的下方，且所述的出水管11连接有炉体5和蓄水池12；
所述的炉体5包括坩埚51，隔热板52，磁感线圈53和炉壁54，所述的坩埚51固定在炉体5内隔热板52的上端；所述的磁感线圈53缠绕在坩埚51的外侧，且所述磁感线圈53的两端穿过炉壁54进入接线管3。
所述的炉壁54包括内壁541，冷却水循环区542和外壁543，所述的内壁541设置在炉壁54的内侧；所述的冷却水循环区542设置在内壁541和外壁543之间。
所述的真空泵2采用双极旋片式真空泵，通过真空管4连接至炉体5的内部，便于抽除炉体5内的气体，使炉体5内保持较高的真空度，有利于降低钕铁硼磁体烧结所需的最高温度，降低能耗。
所述的水泵10采用卧式离心泵，设置在蓄水池12的一侧，稳定性较好，可以将蓄水池12内的冷却水送入进水管9，有利于冷却系统保持稳定，延长使用寿命。
所述的隔热板52采用长方形结构的真空隔热板，固定在炉体5底部与坩埚51之间，避免高温中的坩埚51直接接触炉体5的底部，损坏炉体，引起设备故障，保证真空烧结炉的使用安全。
所述的冷却水循环区542设置在炉壁54的内部，内壁541和外壁543之间，且所述的冷却水循环区542分别连接有进水管9和出水管11，从而便于蓄水池内12的冷却水在冷却水循环区542内完成循环，减少钕铁硼磁体烧结时向炉体外部散发的热量，保护工作人员安全。
工作原理
本发明中，使用者开启水泵10和真空泵2，使蓄水池12内的水通过进水管9进入冷却水循环区542，在通过出水管11回到蓄水池12，完成循环，同时真空泵2将炉体5内的空气抽除，形成真空，再开启中频电源1，磁感线圈53通电获得感应电流，产生大量的热量，对坩埚51内的钕铁硼磁体进行烧结。
利用本发明所述的技术方案，或本领域的技术人员在本发明技术方案的启发下，设计出类似的技术方案，而达到上述技术效果的，均是落入本发明的保护范围。

Claims (6)

  1. 一种新型钕铁硼的烧结用真空烧结炉，其特征在于：包括中频电源(1)，真空泵(2)，接线管(3)，真空管(4)，炉体(5)，底座(6)，炉盖(7)，测温仪(8)，进水管(9)，水泵(10)，出水管(11)和蓄水池(12)，所述的中频电源(1)通过接线管(3)连接有炉体(5)；所述的真空泵(2)设置在中频电源(1)的一侧，且所述真空泵(2)通过真空管(4)连接有炉体(5)；所述的接线管(3)设置在真空管(4)的上侧；所述的炉体(5)放置在底座(6)的上方；所述的炉盖(7)安装在炉体(5)的上部，且所述炉盖(7)的一侧固定有测温仪(8)；所述的进水管(9)的一端固定在炉体(5)的一侧，且进水管(9)的另一端通过水泵(10)连接有蓄水池(12)；所述的出水管(11)设置在进水管(9)的下方，且所述的出水管(11)连接有炉体(5)和蓄水池(12)；
    所述的炉体(5)包括坩埚(51)，隔热板(52)，磁感线圈(53)和炉壁(54)，所述的坩埚(51)固定在炉体(5)内隔热板(52)的上端；所述的磁感线圈(53)缠绕在坩埚(51)的外侧，且所述磁感线圈(53)的两端穿过炉壁(54)进入接线管(3)。
  2. 如权利要求1所述的新型钕铁硼的烧结用真空烧结炉，其特征在于：所述的炉壁(54)包括内壁(541)，冷却水循环区(542)和外壁(543)，所述的内壁(541)设置在炉壁(54)的内侧；所述的冷却水循环区(542)设置在内壁(541)和外壁(543)之间。
  3. 如权利要求1所述的新型钕铁硼的烧结用真空烧结炉，其特征在于：所述的真空泵(2)采用双极旋片式真空泵，通过真空管(4)连接至炉体(5)的内部。
  4. 如权利要求1所述的新型钕铁硼的烧结用真空烧结炉，其特征在于：所述的水泵(10)采用卧式离心泵，设置在蓄水池(12)的一侧。
  5. 如权利要求1所述的新型钕铁硼的烧结用真空烧结炉，其特征在于：所述的隔热板(52)采用长方形结构的真空隔热板，固定在炉体(5)底部与坩埚(51)之间。
  6. 如权利要求2所述的新型钕铁硼的烧结用真空烧结炉，其特征在于：所述的冷却水循环区(542)设置在炉壁(54)的内部，内壁(541)和外壁(543)之间，且所述的冷却水循环区(542)分别连接有进水管(9)和出水管(11)。
PCT/CN2019/109501 2019-09-30 2019-09-30 一种新型钕铁硼的烧结用真空烧结炉 WO2021062655A1 (zh)

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CN203464702U (zh) * 2013-07-18 2014-03-05 洛阳八佳电气科技股份有限公司 一种立式专用烧结炉
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CN208671640U (zh) * 2018-08-02 2019-03-29 赣州诚正稀土新材料股份有限公司 一种新型钕铁硼的烧结用真空烧结炉

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WO2012154490A1 (en) * 2011-05-11 2012-11-15 Memc Singapore Pte, Ltd. Directional solidification furnace heat exchanger
CN203464702U (zh) * 2013-07-18 2014-03-05 洛阳八佳电气科技股份有限公司 一种立式专用烧结炉
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