Method for preparing high-performance high-temperature-resisting nanometer composite permanent magnet

Abstract

The invention discloses a method for preparing a high-performance high-temperature-resisting nanometer composite permanent magnet, relating to preparation techniques of permanent magnetic materials. The method mainly comprises the following steps of: (1) weighing each element raw material according to elements of NdFeB alloy, mixing the element raw materials, melting the mixed raw material in vacuum, and rapidly quenching to prepare thin belts; (2) preparing SmCo ally rapidly quenched belts through the step (1); (3) respectively carrying out high-energy ball milling on the NdFeB and the SmCo alloy rapidly quenched belt to prepare corresponding nanometer crystal alloy powder; (4) mixing the NdFeB and the SmCo nanometer crystal alloy powder according to certain proportion, adding a crystal boundary nanometer modifier to be uniformly distributed on the surfaces of the NdFeB and the SmCo powders to obtain composite powder with the uniformly mixed three; (5) pressing the composite powder to form moulded blanks; (6) carrying out discharge plasma sintering on the moulded blanks to prepare a nanometer composite magnet; and (7) carrying out thermal deformation on the nanometer composite magnet to improve the degree of orientation and obtain the high-performance high-temperature-resisting nanometer composite permanent magnet. The method has the advantages of simple process and easiness in operation, and is suitable for large-scale batch production.

Description

technical field

[0001] The invention relates to the technical field of permanent magnet material preparation, in particular to a method for preparing a high-performance high-temperature-resistant nanocomposite permanent magnet. Background technique

[0002] Neodymium iron boron (NdFeB) permanent magnet is a new generation of rare earth permanent magnet material with high magnetic performance and high cost performance, widely used in various pillar industries and high-tech industries such as computers, communication information, medical treatment, transportation, audio equipment, office automation and home appliances. Technology industry; With the introduction and promotion of my country's energy conservation and emission reduction policy, the demand for high-performance and high-temperature-resistant magnets used in energy-saving and environmental protection fields such as electric vehicles and wind power continues to grow, and the magnetic energy product of NdFeB magnets has ...