| Grain Boundary Microcracking in ZrTiO4-Al2TiO5 Ceramics Induced by Thermal Expansion Anisotropy |
| Ik-Jin Kim, Hyung-Chul Kim, Kee-Sung Lee1, In-Sub Han1 |
Institute for Processing and Application of Inorganic materials(PAIM), Department of Materials Science and Engineering, Hanseo University
1Energy Materials Research Team, Korea Institute of Energy Research(KIER) |
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| ABSTRACT |
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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. |
| Key words:
$Al_2$$TiO_5, $ZrTiO_4$, Grain-boundary microcracking, Anisotropic thermal expansion, Hysteresis |
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