Preparation and Characteristics of $Y_2O_3-CeO_2-ZrO_2$ Structural Ceramics : II. Mechanical Properties and Thermal Stability of Sintered Body

$Y_2O_3-CeO_2-ZrO_2$ 구조세라믹스의 제조 및 특성 : II. 소결체의 기계적 성질 및 열적 안정성

  • 오혁상 (부산대학교 무기재료공학과) ;
  • 이윤복 (부산대학교 무기재료공학과) ;
  • 김영우 (포항산업과학연구원) ;
  • 오기동 (부산대학교 무기재료공학과) ;
  • 박홍채 (부산대학교 무기재료공학과)
  • Published : 1997.01.01

Abstract

ZrO2 powders stabilized with Y2O3 and CeO2 of various compositions were prepared by the coprecipitation of water-soluble ZrOCl2.8H2O, YCl3.6H2O and Ce(NO3)3.6H2O, and their compacts were pressurelessly sintered at 1400 and 150$0^{\circ}C$ for 2hrs in air. 2mol% Y2O3-ZrO3 showed the most superior strength (1003MPa) and microhardness (12.6GPa), while 10 mol%CeO2-ZrO2 had the hightest toughness (13.3 MPa.m1/2) after sintering at 140$0^{\circ}C$. The addition of Y2O3 into Y2O3-ZrO3 decreased mean grain size and increased strength and hardness but decrease toughness. On the other hand, the addition of CeO2 into Y2O3-ZrO2 enhanced the stability of tetragonal phase during low-temperature aging for a long time under hydrothermal atmosphere.

Keywords

$Y_2O_3-CeO_2-ZrO_2$ powders;Strength;Microhardness;Toughness;Stability of tetragonal phase;Low-tem-perature aging;Hydrothermal atmosphere

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