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A method of producing sintered NdFeB magnets

A technology of neodymium iron boron and magnets, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., and can solve problems affecting product performance and other issues

Active Publication Date: 2018-01-12
SANVAC BEIJING MAGNETICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the second-stage aging is carried out in the same aging chamber without the rapid cooling process after the first-stage aging, it may affect the improvement of product performance

Method used

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  • A method of producing sintered NdFeB magnets
  • A method of producing sintered NdFeB magnets
  • A method of producing sintered NdFeB magnets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Takt time T is set to 3h.

[0053] Raw materials are prepared according to the formula with a single batch weight of 200kg and a pre-performance of N44H. The raw materials are made into thin-slab steel ingots through the belt-swinging process, crushed by hydrogen explosion process, air-flow milled, and oriented and pressed under the protection of inert gas to form rough rough. Blank, put the rough blank into the material box, and fill it with inert gas for sealing protection.

[0054] Next, the blank is sintered.

[0055] First, set the parameters of each chamber of the sintering furnace, as shown in Table 2.

[0056] Table 2

[0057]

[0058] Firstly, start the sintering furnace and enter the preparation work for automatic operation. The vacuum system of each chamber is evacuated, and the vacuum degree reaches the requirements of SET3 and other automatic operation conditions are met before entering the automatic operation state.

[0059] Next, put the magazine co...

Embodiment 2

[0068] Set the takt time T as 4h.

[0069] The raw materials are formulated according to the formula with a single batch weight of 300kg and pre-performance of N45SH. The raw materials are made into thin sheet steel ingots through the strip-swing process, crushed by the hydrogen explosion process, air-flow milled, and oriented and pressed under the protection of an inert gas to form a rough billet. Then put the rough blank into the material box, and fill it with inert gas for sealing protection.

[0070] Next, the blank is sintered.

[0071] First, set the parameters of each chamber of the sintering furnace, as shown in Table 3.

[0072] table 3

[0073]

[0074] The sintering process is the same as in Example 1.

[0075] During the entire implementation process, the residence time of the materials in the dewaxing chamber 9, degassing chamber 10, first sintering chamber 11, second sintering chamber 12 and third sintering chamber 13 is 4h, and the entire sintering process...

Embodiment 3

[0077] Set the takt time T as 5h.

[0078] The raw materials are prepared according to the formula with a single batch weight of 350kg and pre-performance of N45SH. The raw materials are made into thin sheet steel ingots through the belt-swinging process, crushed by hydrogen explosion process, air-flow milled, and oriented and pressed under the protection of inert gas to form rough billets. , put the rough blank into the material box, and fill it with inert gas for sealing protection.

[0079] Next, the blank is sintered.

[0080] First, set the parameters of each chamber of the sintering furnace, as shown in Table 4.

[0081] Table 4

[0082]

[0083] The sintering process is the same as in Example 1.

[0084]Throughout the implementation process, the residence time of the materials in the dewaxing chamber 9, degassing chamber 10, first sintering chamber 11, second sintering chamber 12 and third sintering chamber 13 is 5h, and the whole sintering process is smooth witho...

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Abstract

The invention provides a method for producing sintered NdFeB magnets in a continuous sintering furnace provided with a preparation room, a dewaxing room, a degassing room, a first sintering room, a second sintering room, a third sintering room and a cooling room Carried out, including the following steps: 1) preparation; 2) dewaxing, the dewaxing temperature is 300-350 ° C; 3) degassing; 4) pre-sintering; 5) sintering; 6) cooling, wherein dewaxing, degassing, pre-sintering The sintering and sintering steps last for equal times. After sintering, the first stage of aging is carried out in the third sintering chamber, and then cooled. If the sintering time of the blank in the second sintering chamber is not enough, supplementary sintering can also be carried out in the third sintering chamber.

Description

technical field [0001] The invention provides a method for producing sintered NdFeB magnets, in particular to a method for producing sintered NdFeB magnets using a continuous sintering furnace. Background technique [0002] The sintering of sintered NdFeB magnets is carried out under vacuum conditions and high temperature. When using a single-chamber sintering furnace, the substances released during the sintering process will reduce the vacuum of the sintering furnace and cause pollution to the sintering furnace, thereby affecting the quality of the product. The hydrogen gas released during the degassing process will corrode the joints at the end of the thermocouple in the sintering furnace, causing hydrogen embrittlement and fracture of the thermocouple, thereby affecting the quality of the sintered blank. In addition, when a single-chamber sintering furnace is used, repeated heating and cooling occurs, which causes a large loss of energy consumption and increases the cost...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02B22F3/10
Inventor 王浩颉张瑾赵玉刚陈国安朱伟
Owner SANVAC BEIJING MAGNETICS
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