Effect of Silica Coating on Particle Shape and Magnetic Properties of Iron Powder (II)

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J. Korean Ceram. Soc. > Volume 23(2); 1986 > Article

Journal of the Korean Ceramic Society 1986;23(2): 31.

실리카 피착이 철분말의 입자형태 및 자기특성에 미치는 영향(제2보)

오재희, 김종식, 류병환

인하대학교 공과대학 무기재료공학과

Effect of Silica Coating on Particle Shape and Magnetic Properties of Iron Powder (II)

ABSTRACT

The effect of dehydration temperature on the reduction process of silica-coated hematite was invest-igated The particle shape and magnetic properties of the products reduced from hematite at various conditions and the oxidation resistance of silica-coated iron powder were examined. It was revealed that single phase iron powder obtained over 45$0^{circ}C$ had good magnetic properties. The iron powder manufactured between 45$0^{circ}C$ and 50$0^{circ}C$ displayed the maximum coercive force as a result of maintaining its acicular shaped. However the coercive force of iron powder reduced over 50$0^{circ}C$ was decreased. The oxidation resistance of silica-coated iron powder in air was very good up to 11$0^{circ}C$ and for 12 days.