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Sintering method of cylindrical sintered NdFeB

A sintering method and NdFeB technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems of low qualification rate, large bending deformation of blanks, and easy fracture of blanks, so as to improve the qualification rate , Improve the pass rate and control the effect of bending deformation

Inactive Publication Date: 2019-06-28
惠州市福益乐永磁科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned sintering method has certain limitations. If the cylindrical sintered NdFeB product with a smaller diameter and longer length is sintered, due to the smaller diameter and longer length of the green body, the rough (sintered green body) The amount of bending deformation is large, and the blank is easy to break during machining, resulting in a low pass rate of the product
Especially for cylindrical sintered NdFeB products with a sintered diameter of less than 8mm and a length of 35 to 45mm, the deformation of the product is more obvious, and the qualified rate of the product is lower

Method used

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  • Sintering method of cylindrical sintered NdFeB

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The performance is N35, and the NdFeB cylinder with a blank size of 4mm in diameter and 35mm in length is sintered. First, in a protective gas environment, closely arrange the NdFeB cylindrical green bodies, so that the adjacent NdFeB cylindrical green bodies stick together; then, in a vacuum state, pre-sinter the closely arranged NdFeB cylindrical green bodies , the pre-sintering temperature is 990 ℃, the pre-sintering time is 2 h; then, cool out of the furnace, and then tightly arrange the NdFeB cylindrical green bodies, so that the adjacent NdFeB cylindrical green bodies stick together; finally, carry out high-temperature sintering and two times of sintering on the rearranged NdFeB cylindrical green bodies Fire treatment, high temperature sintering temperature is 1045 ℃, the sintering time is 4.5 h; primary tempering temperature is 870 ℃, the primary tempering time is 2 h; the secondary tempering temperature is 520 ℃, the secondary tempering time is 4.5 h.

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Embodiment 2

[0038] The performance is N35, and the NdFeB cylinder with a blank size of 4mm in diameter and 40mm in length is sintered. First, in a protective gas environment, closely arrange the NdFeB cylindrical green bodies, so that the adjacent NdFeB cylindrical green bodies stick together; then, in a vacuum state, pre-sinter the closely arranged NdFeB cylindrical green bodies , the pre-sintering temperature is 1000 ℃, the pre-sintering time is 2 h; then, cool out of the furnace, and then tightly arrange the NdFeB cylindrical green bodies, so that the adjacent NdFeB cylindrical green bodies stick together; finally, carry out high-temperature sintering and two times of sintering on the rearranged NdFeB cylindrical green bodies Fire treatment, high temperature sintering temperature is 1045 ℃, the sintering time is 4.5 h; primary tempering temperature is 870 ℃, the primary tempering time is 2.5 h; the secondary tempering temperature is 520 ℃, the secondary tempering time is 4.5 h. ...

Embodiment 3

[0043] The performance is N38, and the NdFeB cylinder with a blank size of 4mm in diameter and 45mm in length is sintered. First, in a protective gas environment, closely arrange the NdFeB cylindrical green bodies, so that the adjacent NdFeB cylindrical green bodies stick together; then, in a vacuum state, pre-sinter the closely arranged NdFeB cylindrical green bodies , the pre-sintering temperature is 1000 ℃, the pre-sintering time is 2h; then, cool out of the furnace, and then tightly arrange the NdFeB cylindrical green bodies, so that the adjacent NdFeB cylindrical green bodies stick together; finally, carry out high-temperature sintering and two times of sintering on the rearranged NdFeB cylindrical green bodies Fire treatment, high temperature sintering temperature is 1050 ℃, the sintering time is 4.5 h; primary tempering temperature is 870 ℃, the primary tempering time is 2.5 h; the secondary tempering temperature is 500 ℃, the secondary tempering time is 5 h.

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Abstract

The invention relates to a sintering method of cylindrical sintered NdFeB. The method comprises the following steps: S0, cylindrical NdFeB green bodies are tightly arranged in a protective gas environment, and adjacent cylindrical NdFeB green bodies are attached to each other; S1, closely arranged cylindrical NdFeB green bodies are pre-sintered in a vacuum state; S2, cylindrical NdFeB green bodiesare cooled and discharged, then the cylindrical NdFeB green bodies are tightly arranged, so that adjacent cylindrical NdFeB green bodies are attached to each other; and S3, the high-temperature sintering and aging treatment is carried out on the rearranged cylindrical NdFeB green bodies. According to the sintering method of cylindrical sintered NdFeB, the qualification rate of cylindrical sintered NdFeB products with the diameters thereof smaller than 8 mm can be effectively increased.

Description

technical field [0001] The invention relates to a sintering method, in particular to a cylindrical sintered NdFeB sintering method. Background technique [0002] The sintering of sintered NdFeB means that in order to further improve the performance and usability of the magnet, improve the contact properties between powders, increase the strength, and make the magnet have high-performance microstructure characteristics, it is necessary to heat the green body below the melting point of the powder matrix phase temperature and keep it warm for a period of time. [0003] At present, the sintering process of the existing sintering method for cylindrical sintered NdFeB: place the NdFeB cylindrical green body in the sintering material box → fill inert gas protection → enter the furnace → vacuumize → heat → temper. [0004] However, the above-mentioned sintering method has certain limitations. If the cylindrical sintered NdFeB product with a smaller diameter and longer length is sin...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
Inventor 耿霄鹏常双全李海建娄正利
Owner 惠州市福益乐永磁科技有限公司
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