Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Compaction and Sintering Characteristics of High Energy Ball Milled Mn-Zn Ferrite Powders

  • Lee, Hyunseung (Dept. of Materials Science and Engineering, Korea Aerospace University) ;
  • Rhee, Hoseong (Dept. of Materials Science and Engineering, Korea Aerospace University) ;
  • Lee, Sangsoo (Advanced Materials Research Institute, Korea Aerospace University) ;
  • Chang, Si Young (Dept. of Materials Science and Engineering, Korea Aerospace University)
  • Received : 2021.12.01
  • Accepted : 2021.12.07
  • Published : 2021.12.27
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Abstract

The Mn-Zn ferrite powders were prepared by high energy ball milling, then compacted and sintered at various temperatures to assess their sintering behavior and magnetic properties. The initial ferrite powders were spherical in shape with the size of approximately 70 ㎛. After 3 h of ball milling at 300 rpm, aggregated powders ~230 nm in size and composed of ~15 nm nanoparticles were formed. The milled powders had a density of ~70 % when compacted at 490 MPa for 3 min. In the samples subsequently sintered at 1,273 K ~ 1,673 K for 3 h, the MnZnFe2O4 phase was detected. The density of the sintered samples had a tendency to increase with increasing sintering temperature up to 1,473 K, which produced the highest density of 98 %. On the other hand, the sample sintered at 1,373 K had the highest micro-hardness of approximately 610 Hv, which is due to much finer grains.

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Acknowledgement

This work was supported by the Ministry of Trade, Industry and Energy (MOTIE, Korea) under Industrial Technology Innovation Program, No. 20000970.

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