Development of high-performance dry-pressed anisotropic permanent ferrite for La–Ca–Sr–Co system
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In this work, the BMS-12 pre-sintered material was used as the basic material, and the optimal secondary additive addition amount was found by the wet pressing process. Then, the anisotropic ferrite material was prepared by dry-pressing method, and the effects of camphor adhesives, calcium stearate lubricant and powder particle size on the magnetic properties were studied. The experimental results show that the appropriate addition amount of camphor adhesive and calcium stearate lubricant is 0.6 wt% and 0.8 wt%, respectively. High remanence and coercivity can be obtained for particle size of 0.85–1.00 μm. Superior dry-pressed magnet ferrite was prepared with typical properties of magnetic induction intensity of Br = 421 mT, induction coercivity of Hcb = 296 kA·m−1, intrinsic coercivity of Hcj = 369 kA·m−1 and maximum energy product of (BH)max = 33.3 kJ·m−3, which have reached the level of TDK corporation product of FB5D. This shows that the dry-pressed magnet of La–Ca–Sr–Co system has higher remanence and intrinsic coercivity than the traditional wet-pressed Sr-ferrite.
KeywordsDry-press molding Permanent magnetic ferrite La–Ca–Sr–Co system Magnetic properties
This work was financially supported by the National Natural Science Foundation of China (No. 51401023), the National Basic Research Program of China (No. 2014CB643702) and Youth Innovation Fund Project of BGRIMM Technology Group (Nos. QCJ201809, QC-201724 and QCJ201820).
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