Abstract
Synthesis of porous silicon nitride (Si3N4) by using seed crystals was studied. Seed crystals were prepared by heating a powder mixture of α-Si3N4 and sintering aids. Y2O3 was the most effective additive for obtaining seed crystals of high aspect ratio. By adding rod-like seed crystals to α-Si3N4 starting powder, porous Si3N4 with relatively high porosity could be fabricated. In the case of adding 50vol% seed crystal, rod-like grains were well combined, forming a framework. The effect of sintering additives on porosity of the porous body was also studied. By adding 5mass%Y2O3 and 2mass%Al2O3 as sintering additives, the porosity of sintered body was reduced.
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