Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Grain Boundary Microcracking in ZrTiO4-Al2TiO5 Ceramics Induced by Thermal Expansion Anisotropy

  • Kim, Ik-Jin (Institute for Processing and Application of Inorganic materials(PAIM), Department of Materials Science and Engineering, Hanseo University) ;
  • Kim, Hyung-Chul (Institute for Processing and Application of Inorganic materials(PAIM), Department of Materials Science and Engineering, Hanseo University) ;
  • Lee, Kee-Sung (Energy Materials Research Team, Korea Institute of Energy Research(KIER)) ;
  • Han, In-Sub (Energy Materials Research Team, Korea Institute of Energy Research(KIER))
  • Published : 2003.02.01
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Abstract

The grain-boundary microcracking materials in the system $Al_2$TiO$_{5}$ -ZrTiO$_4$(ZAT) is influenced by the thermal expansion anisotropy. The range of ZAT compositions investigated had showed very low thermal expansions of 0.3~1.3$\times$10$^{-6}$ K loin compared to 8.29$\times$10$^{6}$ K of pure ZrTiO$_4$and 0.68$\times$10$^{6}$ K of polycrystalline $Al_2$TiO$_{5}$ , respectively, compared with the theoretical thermal expansion coefficient for a single crystal of $Al_2$TiO$_{5}$ , 9.70$\times$10$^{6}$ K. The low thermal expansion and microcraking temperature are apparently due to a combination of thermal contraction and expansion caused by the large thermal expansion anisotropy of the crystal a ies of the $Al_2$TiO$_{5}$ phase.

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References

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