Production of fine Sr-ferrite particles by ball mill grinding in various grinding conditions

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  • KOTAKE Naoya
    Department of Chemistry and Chemical Engineering Graduate School of Science and Engineering, Yamagata University
  • MOCHIZUKI Takahiro
    山形大学工学部物質工学科 山形大学工学部物質化学工学科
  • OKA Ichiro
    山形大学工学部物質工学科 山形大学工学部物質化学工学科
  • HOSOI Sachiyo
    山形大学工学部物質工学科 山形大学工学部物質化学工学科
  • MURATA Naohiro
    山形大学工学部物質工学科 山形大学工学部物質化学工学科
  • KANDA Yoshiteru
    山形大学工学部

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Other Title
  • 粉砕方式を変えた転動ミル粉砕によるＳｒフェライト微粒子の生成
  • フンサイ ホウシキ オ カエタ テンドウ ミル フンサイ ニ ヨル Sr フェライト ビリュウシ ノ セイセイ

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Abstract

The processes for obtaining fine Sr-ferrite particles have direct efects upon the crystallite size and distribution of sintered Sr-ferrite specimens. The influence of grinding conditions on the production of fine Sr-ferrite particles during ball mill grinding was investigated. The grinding experiments were carried out under dry and wet conditions, and dry condition with methanol as a grinding aid. Particle size distributions of the ground products were measured by the microscopic method, and could be expressed accurately as described by a modified Gaudin-Schuhmann equation. The fine grindability of Sr-ferrite particles was evaluated by the median particle size in undersize distribution, and the ratio of 10% and 90% cumulative weight passing sizes that showed the broadness of the size distribution. Sr-ferrite particles with a median particle size of 0.8-1.0μm were produced. The broadness of the size distribution increased with decreasing median particle size of the ground products. The broadness of the size distribution by wet grinding and dry grinding with a grinding aid was lowered using larger grinding media.

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