Spray Drying of Ferrite Powders and the Characteristics of the Granule

페라이트 분말의 분무건조와 제조된 과립의 특성

  • 변순천 (서울대학교 무기재료공학과) ;
  • 제해준 (한국과학기술연구원 세라믹스연구부) ;
  • 홍국선 (서울대학교 무기재료공학과)
  • Published : 1995.05.01


Mn-Zn ferrite granules were prepared by spray drying of the slurry containing different kinds and concentration of binders at various spray drying temperatures and atomizing pressures. The characteristics of the spraydried granules were analyzed according to the processing variables of spray drying and the slurries containing different solid loading and kinds and concentration of binders. Typical shape of the spray dried granules was spherical. The granules spray dried at 15$0^{\circ}C$ were more spherical and containing lower hollow percentage than any other granules prepared at higher temperature. The granules prepared at higher atomizing pressures were more spherical and become smaller in size. The granules prepared using slurry containing higher solid loading were larger in size and less defective in shape. As increasing the concentration of binder the number of donut-shaped granules was increased and the size distribution become broader. The granules prepared using the slurry containing PVA 205 were more spherical than those containing PVA 217 and PVA 117. As the amount of granules which were donut-shaped or dimpled increased the compaction response were less effective. The hollows were not fractured completely even at hight pressures and remained after sintering.


Spray drying;Ferrite;Granule;Compaction;Binder


  1. Am. Ceram. Soc. Bull. v.62 no.4 Dependence of Compaction on the Glass Transition Temperature of the Binder Phase R.A. DiMillia;J.S. Reed
  2. Modern Ferrite Technology A. Goldman
  3. Am. Ceram. Soc. Bull. v.61 no.2 Compaction of Spray-Dried Powders R.A. Youshaw;J.W. Halloran
  4. Introduction to the Principles of Ceramic Processing J.S. Reed
  5. セラミクスの製造ブロセス 窯業協會
  6. J. Am. Ceram. Soc. v.72 no.4 Spray-Drying Ceramic Powders S.J. Lukasiewicz
  7. Proc. Brit Ceram. Soc. v.10 no.263 Mn-Zn Ferrites with very High Permeability D.J. Perduijn;H.P. Peloschek
  8. Spray Drying K. Masters
  9. Am. Ceram. Soc. Bull. v.59 no.6 Binder Systems in Ferrites J.W. Harvey;D.W. Johnson, Jr.
  10. Am. Ceram. Soc. Bull. v.60 no.2 Effect of Relative Humidity on the Compaction of Titanate and Manganese Zinc Ferrite Agglomerates Containing Polyvinyl Alcohol J.A. Brewer;R.H. Moore;J.S. Reed
  11. Granulation P.J. Sherrington;R. Oliver