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J. Korean Ceram. Soc. > Volume 34(5); 1997 > Article
Journal of the Korean Ceramic Society 1997;34(5): 453.
$Fe_2O_3$몰비 및 Bulcorner첨가가 Sr-Ferrite 특성에 미치는 영향
문기훈, 심영재, 조성걸1
경상대학교 공과대학 무기재료공학과, 생산기술연구소
1경상대학교 공과대학 전자재료공학과, 생산기술연구소
Effect of Molar Ratio of $Fe_2O_3$ and BaO Addition on the Characteristics of Sr-Ferrite
ABSTRACT
Sr-ferrite having magnetoplumbite structure is similar to Ba-ferrite in magnetic characteristics, but better magnetic characteristics for using motor application. To improve remanence magnetic flux density(Br) and coercive force(iHc), it is necessary that sintered ferrites must have high density and grain size less than 1 $mu$m. By varying n values in SrO.nFe2O3 basic composition, calcination temperature, and BaO addition, Sr-ferrite powder and sintered specimen was prepared. The n values, calcination temperature, and BaO addition affected secondary phase formation, particle size, and particle shape. BaO addition enhanced Fe2O3 secondary phase and hexagonal shape particle. Fe2O3 phase reduced sintered density which greatly decreased Br.
Key words: Sr-ferrite, Bao addition, $Fe_2O_3$ phase, Density, Magnetic flux density
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