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Parallel type vacuum thermal treatment device and vacuum thermal treatment method

A vacuum heat treatment, parallel technology, used in aging and metal infiltration treatment, heat treatment of other metal materials, sintering of NdFeB rare earth permanent magnets, parallel vacuum heat treatment equipment and vacuum heat treatment fields, can solve the vacuum furnace vacuum capacity Reduce, reduce heat exchange efficiency, pollute the vacuum system and other problems, to achieve the effect of reducing product qualification rate, improving heat exchange efficiency, and improving service life

Active Publication Date: 2018-12-28
沈阳中北真空技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As NdFeB is a powder metallurgy material, dust will be generated during sintering, aging and metal infiltration, and the dust will enter the vacuum system during vacuuming, contaminate the vacuum system, reduce the vacuuming ability of the vacuum furnace, and often need to replace the vacuum pump oil
During air cooling, as the cooling gas circulates in the heat exchanger and fan, dust is brought into the heat exchanger and fan, especially the heat exchanger, which significantly reduces the heat exchange efficiency
Especially during the vacuum metal infiltration process, the surface of the NdFeB device is adhered to the metal-infiltrated powder. These powders are generally heavy rare earth Dy or Tb. These powders are very easy to oxidize, which will not only damage the vacuum furnace, but also affect the performance of the product.

Method used

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  • Parallel type vacuum thermal treatment device and vacuum thermal treatment method
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Examples

Experimental program
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Effect test

Embodiment 1

[0051]First prepare the NdFeB rare earth permanent magnet alloy, the NdFeB rare earth permanent magnet alloy contains La, Ce, Pr, Nd elements, and the alloy is made into alloy powder through hydrogen crushing and jet milling, and the alloy powder is crushed by a press Carry out molding to make rare earth permanent magnet blanks, and then open the vacuum heat insulation sealing valve of the parallel vacuum heat treatment equipment to transfer the workpieces in the protection feeding car to the hearth in the vacuum furnace body, and then perform the following operations after closing the vacuum heat insulation sealing valve:

[0052] Vacuum to vacuum degree 5×10 -1 When the Pa is above, start heating according to the process curve 1 set on the touch screen. First, heat the billet to 440°C for 1 hour and keep it for 2 hours. Then heat the billet to 850°C for 3 hours and keep it for 2 hours. The billet is heated to 1030°C, held for 2 hours, then cooled to 890°C, held for 2 hours, ...

Embodiment 2

[0054] The NdFeB rare earth permanent magnet material prepared in Example 1 is processed into a device with a size of 30 × 15 × 3mm, and then the device is sent to the vacuum sintering furnace of the parallel vacuum heat treatment equipment of the present invention, and the following vacuum heat treatment process is carried out :

[0055] Vacuum to vacuum degree 5×10 -1 Start heating when Pa is above, heat to 910°C according to the heating process curve 3 on the touch screen, keep warm for 3 hours, then stop heating and vacuumize, after filling with argon, start the air-cooled heat exchange system for cooling, during the cooling process, charge and deflate The system automatically controls the pressure in the furnace at 0.06MPa to 0.09MPa; stop cooling until the temperature is cooled below 300°C; then start vacuuming until the vacuum degree reaches 5×10 -1 Above Pa, start heating according to the process curve of the touch screen, and keep warm at 480°C for 2 hours. After the...

Embodiment 3

[0057] The NdFeB rare earth permanent magnet material prepared in Example 1 is processed into a device with a size of 30 × 15 × 3mm, and then the surface of the device is coated with a coating containing Tb element, and then the device containing the coating of Tb element is sent to the present invention In the described parallel vacuum heat treatment furnace, the following vacuum heat treatment process is carried out:

[0058] Vacuum to vacuum degree 5×10 -1 Start heating when Pa is above, heat to 910°C according to the heating process curve 3 on the touch screen, keep warm for 3 hours, then stop heating and vacuumize, after filling with argon, start the air-cooled heat exchange system for cooling, during the cooling process, charge and deflate The system automatically controls the pressure in the furnace at 0.06MPa to 0.09MPa; stop cooling until the temperature is cooled below 300°C; then start vacuuming until the vacuum degree reaches 5×10 -1 Above Pa, start heating accord...

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Abstract

The invention provides a parallel type vacuum thermal treatment device and vacuum thermal treatment method. The parallel type vacuum thermal treatment device mainly comprises a vacuum sintering furnace and a protection feeding car. The vacuum sintering furnace comprises a vacuum furnace body, a vacuum thermal insulation sealed valve, a heating chamber, air cooling heat exchange system, a vacuum system, an inflation system, a suspended type delivery system and a box tension device. The protection feeding car butts against the vacuum thermal insulation sealed valve. The suspended type delivery system comprises a position sensor assembly and a sensing receiver assembly. The position sensor assembly has no contract sensing with the sensing receiver assembly to ensure the position of the protection feeding car. The air cooling heat exchange system comprises an air cooling dust collection machine. The vacuum system comprises a vacuum dust collector. The vacuum dust collector and the air cooling dust collector both adopt a structure of cyclone collector. The vacuum thermal treatment device is capable of being used for vacuum sintering, vacuum ageing treatment and vacuum metallization treatment of a lanthanon permanent magnet.

Description

technical field [0001] The invention relates to a parallel vacuum heat treatment equipment and a vacuum heat treatment method, belonging to the field of rare earth permanent magnet production equipment, mainly used for sintering, aging and metallization treatment of NdFeB rare earth permanent magnets, and can also be used for heat treatment of other metal materials. Background technique [0002] with R 2 Fe 14 R-Fe-B NdFeB rare earth permanent magnets with B-type compounds as the main phase have been used more and more for their excellent magnetic properties, and are widely used in medical nuclear magnetic resonance imaging, computer hard drives, and mobile phones. Vibration motors, motors for hybrid vehicles, wind turbines, etc. [0003] As NdFeB is a powder metallurgy material, dust will be generated during sintering, aging and metal infiltration, and the dust will enter the vacuum system during vacuuming, contaminate the vacuum system, reduce the vacuuming ability of th...

Claims

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Application Information

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IPC IPC(8): C21D1/773C21D9/00B22F3/10C23C10/30H01F41/02
CPCB22F3/003B22F3/1007B22F2999/00C21D1/773C21D9/0018C23C10/30H01F41/0253H01F41/0293B22F2201/20
Inventor 孙昊天陈晓东杨威力段永利孙宝玉邓文宇齐丽君
Owner 沈阳中北真空技术有限公司