Preparation method of sintered neodymium-iron-boron magnet with high rare earth content
A high rare earth content, neodymium iron boron technology, applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, permanent magnets, etc., can solve the problems of abnormal growth of local particles, low density, poor compactness, etc., to avoid local particles abnormal growth effect
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Embodiment 1
[0028] (S1) According to the mass percentage, the PrNd content is 35.0%, the B content is 0.95%, the Co content is 1.0%, the Al content is 0.55%, the Cu content is 0.10%, the Ga content is 0.40%, the Ti content is 0.10%, and the balance Prepare ingredients for Fe and unavoidable impurities, use a vacuum strip furnace to make thin strip alloy sheets, and obtain green bodies through processes such as hydrogen treatment, grinding, forming and orientation, and isostatic pressing;
[0029] (S2) Put the green body into a vacuum sintering furnace for the first step of sintering, the vacuum degree is below 5×10-1Pa, the sintering temperature is 830° C., and the temperature is lowered to room temperature after 10 hours of heat preservation.
[0030] (S3) In a vacuum atmosphere, re-sinter the blank that has been sintered in the first step. The heating temperature is 820° C., and a pressure of 1 Mpa is applied along the direction of the orientation of the blank while maintaining heat. The...
Embodiment 2
[0034] (S1) According to the mass percentage, the PrNd content is 33.0%, the B content is 0.95%, the Co content is 1.0%, the Al content is 0.55%, the Cu content is 0.10%, the Ga content is 0.40%, the Ti content is 0.10%, and the balance Prepare ingredients for Fe and unavoidable impurities, use a vacuum strip furnace to make thin strip alloy sheets, and obtain green bodies through processes such as hydrogen treatment, grinding, forming and orientation, and isostatic pressing;
[0035] (S2) Put the green body into a vacuum sintering furnace for the first step of sintering, the vacuum degree is below 5×10-1Pa, the sintering temperature is 880° C., keep warm for 2 hours and then drop to room temperature.
[0036] (S3) In a vacuum atmosphere, re-sinter the blank that has been sintered in the first step. The heating temperature is 720° C., and a pressure of 5 MPa is applied along the orientation direction of the blank while maintaining heat. The time for heating and holding is 60 mi...
Embodiment 3
[0040] (S1) According to the mass percentage, the content of PrNd is 37.0%, the content of B is 0.95%, the content of Co is 1.0%, the content of Al is 0.55%, the content of Cu is 0.10%, the content of Ga is 0.40%, the content of Ti is 0.10%, and the balance Prepare ingredients for Fe and unavoidable impurities, use a vacuum strip furnace to make thin strip alloy sheets, and obtain green bodies through processes such as hydrogen treatment, grinding, forming and orientation, and isostatic pressing;
[0041] (S2) Put the green body into a vacuum sintering furnace for sintering, and the vacuum degree is 5×10 -1 Below Pa, the sintering temperature is 865°C, and it is lowered to room temperature after 6 hours of heat preservation.
[0042](S3) In a vacuum atmosphere, re-sinter the blank that has been sintered in the first step. The heating temperature is 850° C., and a pressure of 3 Mpa is applied along the orientation direction of the blank while maintaining heat. The time of heati...
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