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Author: search.filters.author.Charoensuk, ThanidaSubject: search.filters.subject.Barium hexaferrite

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    Modifying Barium Hexaferrite Magnets by Adding SoleGel Synthesized Cobalt Ferrite Phase
    (2023-01-01)
    Charoensuk, Thanida
    ;
    Thongsamrit, Wannisa
    ;
    Hunyek, Anuchit
    ;
    Chokprasombat, Komkrich
    ;
    Jantaratana, Pongsakorn
    Combining various types of ferrites brings about magnetic properties desirable for different applications. This study aims to modify barium hexaferrite (BaFe<inf>12</inf>O<inf>19</inf>) by physically mixing it with cobalt ferrite (CoFe<inf>2</inf>O<inf>4</inf>). BaFe<inf>12</inf>O<inf>19</inf>/CoFe<inf>2</inf>O<inf>4</inf> magnets were produced by ball-milling and pressing solegel-derived ferrite powders. The ferrite composites showed variations in magnetic properties from BaFe<inf>12</inf>O<inf>19</inf> magnets with a saturation magnetization of 69.46 emu/g and a maximum energy product of 0.4529 MGOe. For the BaFe<inf>12</inf>O<inf>19</inf>:CoFe<inf>2</inf>O<inf>4</inf> weight ratio of 4:1, both saturation and remanent magnetizations were increased due to the addition of CoFe<inf>2</inf>O<inf>4</inf> with high magnetizations. However, the magnetizations were reduced when the BaFe<inf>12</inf>O<inf>19</inf>:CoFe<inf>2</inf>O<inf>4</inf> ratio was reduced to 2:1. On the other hand, the coercivity was monotonously decreased with increasing CoFe<inf>2</inf>O<inf>4</inf>. Interestingly, the maximum energy product in this study was linearly decreased with the bulk density of the magnets from 3.59 to 3.15 g/cm<sup>3</sup>. It is concluded that magnetic properties could be modified from a facile physical mixing of ferrites.
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    Loading effect of sol-gel derived barium hexaferrite on magnetic polymer composites
    (2021-03-01)
    Charoensuk, Thanida
    ;
    Thongsamrit, Wannisa
    ;
    Ruttanapun, Chesta
    ;
    Jantaratana, Pongsakorn
    ;
    Sirisathitkul, Chitnarong
    Solution–processing methods were investigated as viable alternatives to produce the polymer-bonded barium hexaferrite (BaM). BaM powders were first synthesized by using the sol-gel auto-combustion method. While the ignition period in two synthesis batches varied, the morphology of hexagonal microplates and nanorods, as well as magnetic properties, were reproduced. To prepare magnetic polymer composites, these BaM powders were then incorporated into the acrylonitrile-butadiene-styrene (ABS) matrix with a weight ratio of 80:20, 70:30, and 60:40 by using the solution casting method. Magnetizations were linearly decreased with a reduction in ferrite loading. Compared to the BaM loose powders and pressed pellet, both remanent and saturation magnetizations were lower and gave rise to comparable values of the squareness. The squareness around 0.5 of BaM samples and their composites revealed the isotropic alignment. Interestingly, the coercivity was significantly increased from 1727–1776 Oe in loose BaM powders to 1874–2052 Oe for the BaM-ABS composites. These composites have potential to be implemented in the additive manufacturing of rare-earth-free magnets.