| Thermal Durability of Al2TiO5-Mullite Composites and Its Correlation with Microstructure |
| Hyung-Chul Kim, Dong-Jin Lee, Oh-Seong Kweon1, Ik-Jin Kim |
Institute for Processing and Application of Inorganic Materials (PAIM), Department of Material Science and Engineering, Hanseo University
1Korea Institute of Ceramic Engineering and Technology (KICET) |
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| ABSTRACT |
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Thermal shock resistance of structural ceramics is a property that is difficult to quantity, and as such is usually expressed in terms of a number of empirical resistance parameters. These are dependant on the conditions imposed, but one method that can be used is the examination of density, Young's modulus and thermal expansion retention after quenching. For high temperature applications, long-annealing thermal durability, cycle thermal stability and residual mechanical properties are very important if these materials are to be used between $1000^{circ}C$ and $1300^{circ}C$. In this study, an excellent thermal shock-resistant material based on $Al_2TiO_5-mullite$ composites of various compositions was fabricated by sintering reaction from the individual oxides and adjusting the composition of $Al_2O_3TiO_2/SiO_2$ ratios. The characterization of the damage induced by thermal shock was done by measuring the evolution of the Young's modulus using ultrasonic analysis, density and thermal expansion coefficients. |
| Key words:
Mullite, Thermal shock, Non-destructive, Ultrasonic, Young's modulus |
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