Sintering method of NdFeB magnet

Abstract

The invention discloses a method for sintering neodymium iron boron magnets. The method for sintering the neodymium iron boron magnets is characterized by comprising the following steps of (1) preparation, wherein neodymium iron boron green bodies are buried in high-temperature resisting powder to enable the neodymium iron boron green bodies to be isolated from air, and the sintering temperature of the high-temperature resisting powder is higher than that of the neodymium iron boron magnets; (2) furnace feeding, wherein the neodymium iron boron green bodies and the high-temperature resisting powder are fed into a sintering space in the furnace together; (3) sintering, wherein the neodymium iron boron green bodies are sintered to form the neodymium iron boron magnets. The method can reduce the oxidation of the neodymium iron boron green bodies before the neodymium iron boron green bodies are fed into the furnace, therefore, sintering deformation is reduced, reserved allowance for the machining of the neodymium iron boron green bodies is reduced, and subsequent machining is made to be convenient.

Description

technical field

[0001] The invention relates to a sintering method of an NdFeB magnet. Background technique

[0002] At present, the known sintering technology for NdFeB magnets is the vacuum sintering method. This method is to discharge the NdFeB green bodies on the rack and put them into the furnace for direct firing. During the process of entering the furnace, the NdFeB green bodies will Brief exposure to air can easily cause oxidation of the green body. During the firing process, due to uneven heating and oxidation on the surface of the green body, it is easy to cause dimensional deformation after sintering. The deformation of the blank after sintering will increase the difficulty and time of subsequent machining, and the blank with severe deformation can only be scrapped or partially utilized. . In order to reduce the influence of this deformation and improve the qualified rate of the product, it is necessary to increase the machining allowance of the blank in the sub...

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