O'-sialon production from silicon oxynitride powder obtained by carbothermal synthesis method

Si2N2O is a significant compound in silicon–oxygen–nitrogen system, as an advanced engineering material which can keep low thermal conductivity, excellent oxidation resistance in air, high flexural strength, and low dielectric constant and loss. Having these excellent properties, Si2N2O has been a promising candidate in varied applications. For example, the powders with rod-like morphology or fiber will benefit the reinforcement of fracture toughness in engineering material matrix. On the contrary, the powders with low aspect ratio will be more suitable to use in areas requiring relative low dielectric constant and loss. Herein, synthesizing morphology-controllable Si2N2O powders crucially affects their further development and extended applications. Recently, core-shell structured powders composed of inorganic particles that were surface coated with carbon nano layers were reported. These powders were synthesized through in situ polymerization of organic polymers on inorganic particle surfaces followed by low temperature pyrolysis. By using carbothermal method production of silicon oxynitride powder had been achieved. Therefore, fine and pure powder had been used for production O'SiAlON ceramics for high temperature application. This method will be useful for production of procure powders for O'-SiAlON as economically and easy. Keywords: Si2N2O, carbothermal synthesis, O'SiAlON, mechanical properties