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Rare earth-containing permanent magnetic ferrite and manufacturing method thereof
The invention discloses a rare earth-containing permanent magnetic ferrite with improved comprehensive magnetic properties and a manufacturing method thereof. The permanent magnetic ferrite mainly comprises: 75-90mass% of Fe2O3, 0.1-3mass% of CaCO3, 0.1-5mass% of La2O3, 0.1-3mass% of Co2O3, 0.1-6mass% of SrCO3, and 0.1-3mass% of BaCO3. The average particle size of the raw materials is required to be less than 5 micrometers. Specifically, the Fe2O3 in the permanent magnetic ferrite comes from ferric oxide raw material, and the ferric oxide raw material contains Mn with a content controlled less than 0.1mass%, the average size of permanent magnetic ferrite grains is about 1.2 micrometers, wherein 10% of the grains is less than 0.8 micromter, 10% of the grains is larger than 1.8 micrometers, the size of the rest grains is in the range, and the ratio of length to diameter is 1.2-2.5. Compared with the prior art, the ball milling process is improved at the same time of ion substitution in the invention, the particles of two particle size systems are mixed to coordinate with each other, and the prepared magnet has higher comprehensive magnetic performance.
Rare earth-containing permanent magnetic ferrite and manufacturing method thereof
The invention discloses a rare earth-containing permanent magnetic ferrite with improved comprehensive magnetic properties and a manufacturing method thereof. The permanent magnetic ferrite mainly comprises: 75-90mass% of Fe2O3, 0.1-3mass% of CaCO3, 0.1-5mass% of La2O3, 0.1-3mass% of Co2O3, 0.1-6mass% of SrCO3, and 0.1-3mass% of BaCO3. The average particle size of the raw materials is required to be less than 5 micrometers. Specifically, the Fe2O3 in the permanent magnetic ferrite comes from ferric oxide raw material, and the ferric oxide raw material contains Mn with a content controlled less than 0.1mass%, the average size of permanent magnetic ferrite grains is about 1.2 micrometers, wherein 10% of the grains is less than 0.8 micromter, 10% of the grains is larger than 1.8 micrometers, the size of the rest grains is in the range, and the ratio of length to diameter is 1.2-2.5. Compared with the prior art, the ball milling process is improved at the same time of ion substitution in the invention, the particles of two particle size systems are mixed to coordinate with each other, and the prepared magnet has higher comprehensive magnetic performance.
Rare earth-containing permanent magnetic ferrite and manufacturing method thereof
WU YUNFEI (Autor:in) / LI JUNHUA (Autor:in) / LI YUPING (Autor:in) / YANG WUGUO (Autor:in)
08.04.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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