Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Growth and characterization of $Al_{2}O_{3}-based\;Y_{3}Al_5O_{12},\;ZrO_{2}$ binary and ternary eutectic fibers

  • Lee, J.H. (Institute for Materials Research, Tohoku University) ;
  • Yoshikawa, A. (Institute for Materials Research, Tohoku University) ;
  • Kaiden, H. (Institute for Materials Research, Tohoku University) ;
  • Fukuda, T. (Institute for Materials Research, Tohoku University) ;
  • Yoon, D.H. (School of Metallurgical and Materials Eng., Sungkyunkwan Univ.) ;
  • Waku, Y. (Japan Ultra-high Temperature Materials Research Center)
  • Published : 2001.08.01
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Abstract

It was possible to grow the $Al_{2}O_{3}$ based $Y_{3}A_{5}O_{12}(YAG),ZrO_{2}$ binary and ternary eutectic fibers using micro-pulling down method with a growing rate of 0.1~15 mm/min. While $Al_{2}O_{3}/ZrO_{2}$ showed cellular-lamellar structure, $Al_{2}O_{3}$/YAG and $Al_{2}O_{3}$/YAG/$ZrO_{2}$ternary eutectic fibers showed homogeneous Chinese script lamellar structures. The microstructures of $Al_{2}O_{3}/ZrO_{2}$ binary eutectic fibers changed with solidification rate from lamellar pattern to cellular structure. The interlamellar spacing agreed with the inverse-square-root dependance on pulling rate according to $\lambda$=$kv_p\;{-1/2}$. $Al_{2}O_{3}/ZrO_{2}$ binary eutectic fibers recorded the highest tensile strength of about 1560MPa at room temperature. $Al_2O_3/YAG/ZrO_2$ternary eutectic fiber showed excellent thermal stability to $1200^{\circ}C$ without significant decrease. The maximum strength of ternary eutectic fibers recorded were 1100MPa at $25^{\circ}C$ and 970MPa at $1200^{\circ}C$, respectively.

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