한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제34권6호
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  • Pages.645-651
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  • 1997
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  • 1229-7801(pISSN)
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  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
권호 표지

$Y_2O_3$와 $Nb_2O_5$가 첨가된 $ZrO_2$의 상 안정성 및 물리적 성질

Phase Stability and Physical Properties of $ZrO_2$ doped with $Y_2O_3$ and $Nb_2O_5$

  • 발행 : 1997.06.01
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초록

입성장 제어없이 정방정 니르코니아의 파괴인성과 상 안정성을 증진시키기 위해 $Y_{2}O_{3}$와 $Nb_{2}O_{5}$가 첨가된 정방정 지르코니아를 상압소결방법으로 제조하였다. 지르코니아 복합체는 상 안정성이 뛰어난 조성에 상변화가 우수한 조성을 중량비로 혼합 합성하였다. 상변화가 우수한 조성을 15 wt% 첨가한 복합체와 동일한 단일조성의 경우 공기중에 $1500^{\circ}C$ 10시간 소결후 9$MPam^{1/2}$의 파괴인성값과 $220^{\circ}C$에서 $1000^{\circ}C$/까지 100시간이상 agmg을 한 뒤에도 우수한 저온 및 고온 상 안정성이 관찰되었다. 복합체와 상응하는 단일조성은 90.24 mol% $ZrO_2$-5.31 mol% $Y_{2}O_{3}$ mol% $Nb_{2}O_{5}$이었다. 조직관찰 결과 결정립은 소결시간에 따라 증가하였으며 미세균열이나 twinning은 발견되지 않았다.

Tetragonal zirconia polycrystals (TZPs) doped with $Y_{2}O_{3}$ and $Nb_{2}O_{5}$ were prepared by the conventional sintering to enhance fracture toughness and phase stability of TZPs without controlling the grain size. TZP composites were obtained by adding the transformable TZP to the non-transformable TZP in wt%. The monolithic tetragonal $ZrO_2$, same as the composite composition containing 15 wt% transformable TZP, sintered at $1550^{\circ}C$ for 10h in air, exhibited the fracture toughness of 9$MPam^{1/2}$ and no low-and high-temperature degradation at temperatures in the range of 220 to $1000^{\circ}C$ for 100h in air. The corresponding single composition was 90.24 mol% $ZrO_2$-5.31 mol% $Y_{2}O_{3}$-4.75 mol% $Nb_{2}O_{5}$. The microstructure observation revealed that the t-$ZrO_2$ grains grew grandually with sintering time and no microcraking and twinning were observed.

키워드

참고문헌

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