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Self-Propagating High-Temperature Synthesis (SHS) of the Si-N 2  system is a typical SHS using a gas-solid system to obtain one of the most important advanced ceramics – silicon nitride. For improving the properties and reliability of Si 3 N 4 -based ceramics, SHS of Si–TiC–N 2  and Si–TiO 2– N 2  are investigated in this work. Stability diagrams at combustion temperatures are established through thermodynamic calculations. In contrast to the conventional idea of “diluent”, a new idea of “active diluent” is proposed. In these two systems TiC and TiO 2  not only act as diluents, but also participate in the reactions during SHS. Two new kinds of in-situ particulate reinforced ceramic composites, Si 3 N 4 /SiC/TiCN, Si 3 N 4 /Si 2 N 2 O/TiN, are developed.

Thermodynamics and Combustion Synthesis of Si–TiC–N and Si–TiO 2 –N