J. Korean Ceram. Soc. > Volume 52(6); 2015 > Article
 Journal of the Korean Ceramic Society 2015;52(6): 423. doi: https://doi.org/10.4191/kcers.2015.52.6.423
 Fabrication and Machinability of Mullite-ZrO2-Al2TiO5 Ceramics Young Been Shin, Won Jae Lee, Il Soo Kim Department of Advanced Materials Engineering, Dongeui University ABSTRACT The machinability of materials is an important factor in engineering applications. Many ceramic components that have complex shapes require machining, typically using diamond tools, which leads to high production cost. Machinable ceramics containing h-BN have recently been developed, but these materials are very expensive because of high cost of raw materials and machining. Therefore the development of low-cost machinable ceramics is desirable. In this study, mullite-$ZrO_2$ ceramics were prepared additions of $Al_2TiO_5$. $ZrSiO_4$, $Al_2O_3$, and $Al_2TiO_5$ powders mixed at various molar ratios with sintering at 1400, 1500, and $1600^{circ}C$ for 1 hr. Phase formation and microstructure of the sintered ceramics were observed by XRD and SEM, respectively. The machinability of each specimen was tested using the micro-hole machining method. The machinability results show that the ceramics sintered at temperatures over $1500^{circ}C$ can be used as good low-cost machinable mullite-$ZrO_2-Al_2TiO_5$ ceramics. Key words: Mullite-$ZrO_2$, $Al_2TiO_5$, Machinable ceramics, Reaction sintering
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