Initial Sintering Mechanism of Fine Zirconia Particles Including a Small Amount of Alumina

DOI

説明

The sinterabilities of fine zirconia powders including 5 mass% Y2O3 were investigated with emphasis on the effect of Al2O3 addition on densification at the initial stage. The powders were pressed into disks and sintered at 1100-1500°C in air. When a small amount of Al2O3 was added, high-density sintered bodies were obtained at a low temperature. The shrinkage of powder compact in the course of heating was measured by a dilatometric method, indicating that the addition of Al2O3 increased the densification rate with elevating temperature. The activation energies of sintering were determined by analyzing the densification curves. The activation energy at the initial stage of sintering decreased by Al2O3 addition. The analysis of isothermal shrinkage curves exhibited that the diffusion mechanism changed from grain-boundary to volume diffusions by addition of Al2O3. It is concluded that the Al2O3 addition enhanced the densification because of decreasing the activation energy of volume diffusion at the initial stage of sintering.

収録刊行物

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詳細情報 詳細情報について

  • CRID
    1390282680499895680
  • NII論文ID
    130004610198
  • DOI
    10.14852/jcersjsuppl.112.0.s343.0
  • ISSN
    13492756
  • 本文言語コード
    en
  • データソース種別
    • JaLC
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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