Mechanical Properties of Hot-Pressed TZP Ceramics Doped with Y_2O_3 and Nb_2O_5

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Y<SUB>2</SUB>O<SUB>3</SUB> and Nb<SUB>2</SUB>O<SUB>5</SUB> co-doped tetragonal ZrO<SUB>2</SUB> polycrystals (TZPs) were synthesized by hot-pressing (HPing) at temperatures in the range of 1300 to 1500°C to investigate the effect of alloying on the mechanical properties of TZPs. TZPs (89.25 mol% ZrO<SUB>2</SUB>-5.75 mol% Y<SUB>2</SUB>O<SUB>3</SUB>-5.00 mol% Nb<SUB>2</SUB>O<SUB>5</SUB> and 90.24 mol% ZrO<SUB>2</SUB>-5.31 mol% Y<SUB>2</SUB>O<SUB>3</SUB>-4.45 mol% Nb<SUB>2</SUB>O<SUB>5</SUB>), prepared by HPing at 1400°C for 1 h, showed a negligible monoclinic (m-) ZrO<SUB>2</SUB> content (<1%), the highest flexural strength of about 1 GPa, and the fracture toughness of above 7.5 MPa·m<SUP>1⁄2</SUP>. Both low and high temperature (250 to 1000°C) aging for up to 100 h was carried out to evaluate the phase stability. TZPs, aged at temperatures higher than 400°C, suffered from strength degradation due to the extensive cavitation caused by graphite oxidation. The carbon incorporated in TZPs was identified as either an ether-type C–O or a carbonyl-type C=O. On the other hand, the specimens aged at temperatures lower than 400°C maintained the phase stability and mechanical properties.

収録刊行物

  • Materials transactions, JIM

    Materials transactions, JIM 39(2), 262-267, 1998-02

    社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10003801748
  • NII書誌ID(NCID)
    AA10699969
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09161821
  • NDL 記事登録ID
    4427654
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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