Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Preparation and Characteristics of $Al_2O_3/TZP$ Composites Using Liquid Infiltration Technique

액상침투법을 이용한 $Al_2O_3/TZP$ 복합체의 제조 및 특성

  • Yang, Tae-Yeong (Division of Materials Science and Engineering, Pusan National University) ;
  • Lee, Yun-Bok (Division of Materials Science and Engineering, Pusan National University) ;
  • Kim, Yeong-U (Research Institute of Industrial & Technology) ;
  • O, Gi-Dong (Division of Materials Science and Engineering, Pusan National University) ;
  • Park, Hong-Chae (Division of Materials Science and Engineering, Pusan National University)
  • 양태영 (부산대학교 재료공학부) ;
  • 이윤복 (부산대학교 재료공학부) ;
  • 김영우 (포항산업과학기술연구원) ;
  • 오기동 (부산대학교 재료공학부) ;
  • 박홍채 (부산대학교 재료공학부)
  • Published : 2000.05.01
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Abstract

Two kinds of $Al_2O_3/TZP$ composites were prepared using the liquid infiltration of 3Y-TZP and 12Ce-TZP precursors into hte sintered porous $Al_2O_3$. Small TZP additions(~11.0wt%) had increased the strength(19~59%) and fracture toughness(14~157%) of the sintered Al2O3 material($1600^{\circ}C$, 2h). The addition of 3Y-TZP was effective on case of the strength. By the way, in case of the fracture toughness that of 12Ce-TZP was effective. Infiltrated TZP was concentrated on the surface where its grain growth was enhanced and $Al_2O_3$ grain growth was effectively inhibit-ed, when compared to the inner region of the composite. The indentation crack was propagated through both intergranular modes and transgranular and the proportion if intergranular fracture was the larger in $Al_2O_3/12Ce-TZP$.

다공성 알루미나 소결체내부로 3Y-TZP 및 12Ce-TZP 전구체를 각각 액상침투시킴으로써 2종류의 $Al_2O_3/TZP$복합체를 제조하였다. 소량의 (~11.0 wt%) TZP의 첨가는 Al2O3소결체 ($1600^{\circ}C$, 2시간)의 강도 (19~59%)와 파괴인성(14~157%)을 증가시켰다. 3Y-TZP의 첨가는 복합체의 강도의 향상에 12Ce-TZP의 첨가는 인성의 향상에 보다 효과적이었다. 침투도니 TZP는 복합체의 내부보다 표면에 집중되었으며, 그 결과 이곳에서의 입성장에 빨랐고 $Al_2O_3$의입성장 억제효과도 상대적으로 뛰어났다. 입계 및 입내균열전파가 일어났으나 $Al_2O_3/12Ce-TZP$의 경우가 $Al_2O_3/3Y-TZP$에 비하여 입계파괴가 우세하였다

Keywords

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