| 简介 |
The embodiment of the invention discloses a preparation method for a high temperature resistance radiation orientation or multi-pole orientation neodymium iron boron annular magnet. The method comprises the following steps that the surface of the radiation orientation or multi-pole orientation neodymium iron boron annular magnet is coated with a coating material containing heavy rare earth elements, and heavy rare earth element treatment is performed on the coated neodymium iron boron annular magnet; then, aging treatment is performed; gas quenching treatment is performed on the neodymium ironboron annular magnet obtained after aging treatment; then anti-oxidation treatment is performed on the surface, and the high temperature resistance radiation orientation or multi-pole orientation neodymium iron boron annular magnet is obtained. According to the method, the surface of the neodymium iron boron annular magnet is coated with heavy rare earth elements, permeation treatment is performed, the heavy rare earth elements can permeate the crystal boundary of the neodymium iron boron annular magnet, the intrinsic coercive force of the radiation orientation or multi-pole orientation neodymium iron boron annular magnet is improved, the neodymium iron boron annular magnet is not likely to be demagnetized under the high temperature, and the high temperature resistance of the radiation orientation or multi-pole orientation neodymium iron boron annular magnet is improved. |
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