Abstract
Weight loss which occurs while sintering composited Si3N4 powders requires the loss of one or more of the end‐member constituents through a volatilization reaction. By plotting the direction of the compositional change on the appropriate equivalence phase diagram, the principal volatilization reaction can be determined. For a particular composition in the system Si‐Y‐N‐O sintered at 1750°C, the principal volatilization reaction was Si3N4(s) +3SiO2(s)→6SiO(g) +2N2(g).

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