Sintering Aging Process Used to Produce NdFeB Permanent Magnets
A permanent magnet material, NdFeB technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of low precision in controlling intermittent air cooling, cracking of NdFeB permanent magnet materials, etc., to avoid cracking Phenomenon, improvement of product quality, significant economic benefits
Active Publication Date: 2015-09-23
中稀依诺威(山东)磁性材料有限公司
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[0002] It has been widely used in computer, communication and other industries, especially in traveling wave tubes and circulators of artificial satellites and radars, as well as in micro motors, micro recorders, aviation instruments, electronic watches, seismographs and other electronic instruments. Application, the current application of rare earth permanent magnets has penetrated into automobiles, household appliances, electronic instruments, nuclear magnetic resonance imaging instruments, audio equipment, micro-special motors, mobile phones, etc.; in medical treatment, the use of rare earth permanent magnet materials for "magnetic hole therapy" , so that the curative effect is greatly improved, thus promoting the rapid promotion of "magnetic hole therapy"; therefore, NdFeB permanent magnet material is a permanent magnet material with the highest comprehensive performance. When preparing NdFeB permanent magnet material, it is necessary to follow the Ingredients-smelting-milling-molding-sintering-aging process is carried out. The sintering aging process is an important stage in the production of NdFeB permanent magnet materials. In the existing sintering aging process for producing NdFeB permanent magnet materials In the process, when aging after sintering, the NdFeB permanent magnet body is cooled by rapid cooling or air-inflated self-cooling or intermittent air cooling. Due to the use of intermittent air cooling, the accuracy of intermittent air cooling is not high. , resulting in cracking of the NdFeB permanent magnet material body, figure 1 It is the first process diagram of the existing conventional winding aging, figure 2 It is the second process diagram of the existing conventional winding aging, image 3 It is the third process diagram of the existing conventional winding aging
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[0021] Hereinafter, the present invention will be further described with reference to the examples. The following examples are intended to illustrate the present invention but not to further limit the present invention. The first embodiment of the present invention.
[0022] The steps are:
[0023] 1. Place the neodymium iron boron permanent magnet material body in the winding furnace, use a vacuum pump to make the vacuum of the winding furnace 0.001 Pa, and according to the heating mode of 5℃ / min, make the temperature of the winding furnace reach 1040℃. Keep it for 3 hours, and then let the neodymium iron boron permanent magnet material body in a winding furnace with a vacuum of 0.001 Pa, and naturally cool it to a temperature T1 of 150° C., and then proceed to the sintering process.
[0024] 2. Then heat the winding furnace to 850℃, keep it for 1h, and then heat the winding furnace to the winding furnace, use the variable frequency speed control fan to keep low wind speed for cont...
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The invention discloses a sintering aging process for preparing a neodymium-iron-boron permanent magnet material. The sintering aging process comprises the following step of: continuously cooling a neodymium-iron-boron permanent magnet material body in a sintering furnace at a blowing rate with low wind velocity in cooling of an aging procedure. According to the process, as an intermittent air cooling manner is not used, the control on the cooling speed is more accurate, the temperature gradient between the surface and the center of a neodymium-iron-boron permanent magnet is reduced, and therefore, a cracking phenomenon is avoided.
Description
technical field [0001] The invention relates to a sintering aging process, in particular to a sintering aging process for preparing NdFeB permanent magnet materials. Background technique [0002] It has been widely used in computer, communication and other industries, especially in traveling wave tubes and circulators of artificial satellites and radars, as well as in micro motors, micro recorders, aviation instruments, electronic watches, seismographs and other electronic instruments. Application, the current application of rare earth permanent magnets has penetrated into automobiles, household appliances, electronic instruments, nuclear magnetic resonance imaging instruments, audio equipment, micro-special motors, mobile phones, etc.; in medical treatment, the use of rare earth permanent magnet materials for "magnetic hole therapy" , so that the curative effect is greatly improved, thus promoting the rapid promotion of "magnetic hole therapy"; therefore, NdFeB permanent ma...
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IPC IPC(8): B22F3/16H01F1/057
Inventor张书凯
Owner中稀依诺威(山东)磁性材料有限公司