Abstract
We prepared porous Si3N4 ceramics with highly ordered and unidirectionally aligned channels by the self-organization method using an alginate template. The obtained samples show uniform pore distribution, high cell density, good mechanical strength and hierarchical pore structure. A great number of long fibrous β-Si3N4 grains protrude into channels, and other short length fibrous β-Si3N4 grains interlock within channel walls forming a peculiar hierarchical pore structure. The pore size, thickness of channel walls, cell density, porosity and mechanical properties of the sintered porous Si3N4 ceramics could be controlled by choosing different solid loadings, whereas β-Si3N4 grains growth could be controlled by adopting different sinter temperatures.
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