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Influence of the SiO2 Additions on the Si3N4 Decomposition Reaction during Sintering Cycles without Pressure

In the present work, the influence of the SiO 2 addition on the decomposition reaction is studied, with this aim a wide composition range is covered, going from a content of silica barely superior to the commercial powder until reaching the necessary amount to get the stoichiometric ratio for the silicon oxynitride formation. The results obtained for sintering without pressure of Si 3 N 4 with SiO 2 additions are analyzed in function of the weight loss and these show that it is not the Si 3 N 4 decomposition the only reaction responsible for the weight loss. The weight loss rate increase with SiO 2 content. Additionally, sintering cycles without pressure in nitrogen atmosphere using powder beds (50 wt.% Si 3 N 4 + 50 wt.% BN) were made. The use of nitrogen atmosphere and powder beds tends to avoid the Si 3 N 4 decomposition.