Porous alumina ceramics have been prepared by direct ink writing using Pluronic F-127 hydrogel as binder and rice husk a pore former. The ink for direct ink writing (DIW) consisted of hydrogel, alumina, and rice husk. The composition of the ink consisted of 65 wt.% solid loading and the rest 35 wt.% is hydrogel. Within the 65 wt.% solid loading, the ration of alumina and rice husk was varied. Overall, the wt.% of the rice husk was, 1 wt.%, 3 wt.%, 5 wt.%, 7.5 wt.%, and 10 wt.%. The particle size of rice husk was less than 45 µm. After DIW, hydrogel debinding was carried out. Subsequently, sintering was carried out at 1600 °C for 90 minutes. The microstructure of the samples before and after sintering showed the formation of porous structure after sintering, due to the addition of rice husk. The lowest density of the sample measured is 3.05 g/cc for sample with 10 wt.% rice husk and the highest density of 3.37 g/cc was obtained by sample with 1 wt.% rice husk.

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