フェライト焼結体の摩耗と内部摩擦の温度変化

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タイトル別名
  • Abrasion and Tempepature Dependence of Internal Friction of Some Polycrystalline Ferrites
  • フェライト ショウケツタイ ノ マモウ ト ナイブ マサツ ノ オンド ヘンカ

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説明

Temperature dependences of Young's modulus and internal friction of polycrystalline nickel-zinc and manganese ferrites were measured with sonic resonance technique. The effects of porosity of ferrite and small quantity of additives to ferrite on the temperature dependences were also examened. Exfoliation of grain particles from a polycrystalline ferrite was discussed with respect to the internal friction of the grain boundary. The results were as follows.<br>1) Young's moduli of nickel-zinc and manganese ferrites were measured in the temperature range from room temperature to about 1100°C. The temperature dependence of Young's moduli showed a discontinuous change in the vicinity of Curie temperature in both nickel-zinc and manganese ferrites.<br>2) In the temperature dependence curve of internal friction of nickel-zinc ferrite, large internal friction which must have resulted from anelasticity of grain boundary was observed. This large internal friction increased with increasing temperature without showing any maximum point.<br>3) The temperature in which internal friction resulting from anelasticity of grain boundary appears, shifted to lower with larger porosity in nickel-zinc ferrite.<br>4) The temperature dependence curve of internal friction of manganese ferrite showed a maximum in the vicinity of 700°C. This maximum is reasonably attributed to anelasticity of grain boundary, but not to the precipitated α-Fe2O3 on grain boundaries.<br>5) Small quantity of some additives to manganese ferrite effected on the magnitude of internal friction and the temperature in which internal friction showed its maximum. The addition of small quantity of SiO2 to manganese ferrite decreased the internal friction and shifted the maximum temperature of internal friction to higher temperature side. And the manganese ferrite with small quantity of SiO2 showed little exfoliation of grain particles from the mother polycrystalline ferrite when the ferrite was rubbed with γ-Fe2O3 magnetic tape.

収録刊行物

  • 窯業協會誌

    窯業協會誌 78 (900), 256-263, 1970

    公益社団法人 日本セラミックス協会

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