A Comparative Study of Double Layers Al_2O_3/Al_2O_3 and Al_2O_3/SiO_2 Prepared By Microwave and Natural Drying

In this work, a comparative study of green double layers ceramic bodies prepared by natural and microwave drying techniques was investigated. The double layers ceramic with combination of Al_2O_3/Al_2O_3 and Al_2O_3/SiO_2 samples were prepared via compaction method. Alumina powder, Al_2O_3 with particle size 90μm and 45μm, silica powder, SiO_2 with particle size 45μm were used in this study. Measurement of linear shrinkage of pellet shows that microwave drying contributed to lower shrinkage value compared to the natural drying method. The characterization of the microstructure of double layers ceramic body also showed that microwave technique formed a good bonding structure especially at the critical interface layer. In fact, the implementation of microwave drying also significantly reduced the drying time and produced a good and homogenous final structure.