Fabrication of Mn-Zn Ferrite by Hot Petroleum Drying Method

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J. Korean Ceram. Soc. > Volume 16(2); 1979 > Article

Journal of the Korean Ceramic Society 1979;16(2): 69.

석유증발 건조방법에 의한 Mn-Zn Ferrite의 제조에 관한 연구

변수일

한국과학원 재료공학과

Fabrication of Mn-Zn Ferrite by Hot Petroleum Drying Method

ABSTRACT

This study attempted to characterize the powder and sintered specimen of Mn-Zn ferrite that was prepared by Hot Petroleum Drying Method. The results of the experiment were as follows: 1. The mixed sulfate powder prepared by Hot Petroleum Drying Method was homogeneous and very reactive. The ferrite formation of this powder occurred at lower temperature than the one prepared by Sulfate Dry Mixing Method. 2. The calcined oxide powder prepared by Hot Petroleum Drying Method was found to be agglomerated, and therefore it was very difficult to compact this powder. 3. The sintered density was 4.95g/㎤, 97% of the theoretical density, when the specimen was prepared by Hot Petroleum Drying method, calcined at 90$0^{circ}C$ in air for 3h, sintered at 1,30$0^{circ}C$ in air for 3h, and then cooled in nitrogen. 4. The discontinuous grain growth occurred at lower temperature in the specimen prepared by Hot Petroleum Dyring Method than in the one prepared by Sulfate Dry Mixing Method. The discontinuous grain growth was considered to be due to the presence of liquid formed by addition of CaO and $SiO_2$.