材料科学
纳米晶材料
矫顽力
磁铁
退火(玻璃)
各向同性
球磨机
肺表面活性物质
纳米颗粒
钴铁氧体
钴
冶金
化学工程
复合材料
纳米技术
机械工程
凝聚态物理
光学
工程类
物理
作者
Francisco J. Pedrosa,Javier Rial,Karol Golasiński,Matylda N. Guzik,A. Quesada,J.F. Fernández,Stefano Deledda,J. Julio Camarero,A. Bollero
摘要
We report on a comparative study of high performance isotropic cobalt ferrite (CoFe2O4) powder processed by dry and surfactant assisted (wet) ball milling. Milling times as short as 1.5 min (dry) and 6 min (wet) have resulted in a 4-fold increase in coercivity, with a maximum achieved value above 318 kA/m (4 kOe). The use of surfactant is shown to be advantageous in the formation of a more homogeneous structure constituted by non-agglomerated and strained nanoparticles. A record (BH) max value of 18.6 kJ m −3 (2.34 MGOe) has been obtained for isotropic powder after post-processing annealing. This magnetic performance combined with the required short processing times and the unnecessary requirement of oxygen avoidance in the milling process, makes this CoFe2O4 powder a good candidate for permanent magnet applications.
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