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Neodymium-iron-boron sintering and tempering method

A neodymium iron boron and tempering furnace technology is applied in the field of magnetic materials and neodymium iron boron sintering heat treatment. The effect of heating efficiency

Active Publication Date: 2018-06-29
BEIJING JINGCI ELECTRIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional mass sintering and tempering method, due to the structure of the furnace body and the way of loading materials, there are great differences in the heating curve of each material level, the time to temperature, the temperature after stabilization, and the holding time. This results in huge differences in the sintering and tempering process of magnets at various material levels during actual mass production, resulting in differences in magnet performance and affecting product consistency and pass rate

Method used

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Examples

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Effect test

Embodiment 1

[0029] Fill the graphite material box with the NdFeB blank cutting material. The size of the graphite material box is 300mm*200mm*80mm. For the stacking method of the graphite material box, see figure 1 , specifically: code from bottom to top into six layers, the stacking method of the first layer and the second layer is to code the 300mm direction into two columns, code the 200mm direction into 6 rows, and code the 80mm direction into 2 layers; the third The stacking method of the first layer and the fourth layer is to code the 300mm direction to the edge into 4 rows, and the graphite box 200mm to the edge direction to be coded into two rows, leaving the middle empty to form a cavity, and the 80mm direction to be coded into 2 layers; the fifth layer The stacking method of the sixth layer is to code the 300mm direction into two columns, the 200mm direction into 6 rows, and the 80mm direction into 2 layers. According to the temperature zone distribution of NdFeB, we define the ...

Embodiment 2

[0045] Fill the graphite material box with the NdFeB blank cutting material. The size of the graphite material box is 300mm*200mm*80mm. For the stacking method of the graphite material box, see figure 1 , specifically: code from bottom to top into six layers, the stacking method of the first layer and the second layer is to code the 300mm direction into two columns, code the 200mm direction into 6 rows, and code the 80mm direction into 2 layers; the third The stacking method of the first layer and the fourth layer is to code the 300mm direction to the edge into 4 rows, and the graphite box 200mm to the edge direction to be coded into two rows, leaving the middle empty to form a cavity, and the 80mm direction to be coded into 2 layers; the fifth layer The stacking method of the sixth layer is to code the 300mm direction into two columns, the 200mm direction into 6 rows, and the 80mm direction into 2 layers. Close the furnace door, ensure that there is no air leakage point, vacu...

Embodiment 3

[0047] Fill the graphite material box with the NdFeB blank cutting material. The size of the graphite material box is 300mm*200mm*80mm. For the stacking method of the graphite material box, see figure 1 , specifically: code from bottom to top into six layers, the stacking method of the first layer and the second layer is to code the 300mm direction into two columns, code the 200mm direction into 6 rows, and code the 80mm direction into 2 layers; the third The stacking method of the first layer and the fourth layer is to code the 300mm direction to the edge into 4 rows, and the graphite box 200mm to the edge direction to be coded into two rows, leaving the middle empty to form a cavity, and the 80mm direction to be coded into 2 layers; the fifth layer The stacking method of the sixth layer is to code the 300mm direction into two columns, the 200mm direction into 6 rows, and the 80mm direction into 2 layers. Close the furnace door, ensure that there is no air leakage point, vacu...

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Abstract

The invention discloses a neodymium-iron-boron sintering and tempering method. The method comprises the steps that a periphery heater is arranged on the periphery of a sintering or tempering furnace;a central heater is arranged in the center of the sintering or tempering furnace; abd a plurality of graphite charge boxes filled with neodymium-iron-boron blank cut materials are placed in the sintering or tempering furnace in the mode that the graphite charge boxes define a cavity of the same length as an inner cavity of the sintering or tempering furnace, and the central heater is arranged in the cavity. By means of the method, neodymium-iron-boron magnets are heated more uniformly in the sintering or tempering stage of the neodymium-iron-boron magnets, temperature difference between material levels in a furnace body is greatly reduced, and the consistency of the mass-produced neodymium-iron-boron magnets in the heating, heat preservation and cooling stages is ensured; and the heating efficiency of the neodymium-iron-boron sintering or tempering stage is improved.

Description

technical field [0001] The invention relates to the field of magnetic materials. More specifically, the present invention relates to the field of NdFeB sintering heat treatment, and more specifically, the present invention relates to a NdFeB sintering and tempering method. Background technique [0002] Sintered NdFeB permanent magnets are widely used in the fields of automobiles, electronics, electric power, energy, medical care, and information technology because of their excellent comprehensive magnetic properties. Sintered NdFeB permanent magnets are key materials for high efficiency and energy saving. Hybrid electric vehicles, inverter air conditioners, consumer electronics and wind power generation have very broad application prospects. [0003] With the continuous improvement of the process of sintered NdFeB, the performance of sintered NdFeB has been continuously improved, and the competition in the industry has become increasingly fierce. A series of improvements h...

Claims

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Application Information

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IPC IPC(8): B22F3/10B22F3/24
CPCB22F3/101B22F3/24B22F2003/1042B22F2003/248B22F2999/00B22F2201/20B22F2201/11
Inventor 余远
Owner BEIJING JINGCI ELECTRIC TECH CO LTD
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