Protective film preparation method, protective film and neodymium-iron-boron magnet sintering dewaxing process
By using a protective film prepared by copolymer of polyimide and polyether ether ketone, combined with a specific sintering and dewaxing process, the problem of manual removal of traditional protective materials is solved, and the automatic deplastication of neodymium iron boron magnets is achieved and the oxygen content is effectively controlled, and the production efficiency and magnetic performance are improved.
Patent Information
- Application Number
- CN202411852208.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-03-28
AI Technical Summary
In the manufacturing process of neodymium iron boron magnets, traditional protective materials need to be manually removed before sintering, which consumes time and labor, increases production costs, and it is difficult to ensure that the oxygen content of the magnet is within the ideal range, affecting magnetic properties.
A copolymer of polyimide and polyether ether ketone is used as a protective film, and a protective film of the desired shape and size is made by melt extrusion and/or injection molding, and combined with a specific sintering and dewaxing process, the automatic deplasting of the protective film during the sintering process is achieved.
The automatic deplastication of neodymium iron boron magnets during sintering is achieved, which improves production efficiency, reduces the defective yield, and effectively controls the oxygen content of the magnets and optimizes the magnetic performance.