Combustion synthesis of Si-SiC composite powders derived from different silica precursors
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Silicon-silicon carbide (Si-SiC) composite powders were produced by in-situ magnesiothermic self-combustion synthesis in astatic argon atmosphere, using precursors of carbon, magnesium and either rice husk ash (RHA) or natural sand. Thedescription of the reaction involves initial the combustion reaction, the phase conversion through the product, and the coolingrate. The adiabatic temperature (Tad), the enthalpy of the reaction (ΔH) and the equilibrium composition of the reacting specieswere calculated. Pure Si-SiC powders were obtained by leaching with a solution of HCl: CH3COOH followed by HF : H2Osolution. Both the experimental results and the thermodynamic analysis indicated that the exothermic effect on the conversionof Mg2SiO4 had a large influence on the resultant Si-SiC composite.
Abstract
Silicon-silicon carbide (Si-SiC) composite powders were produced by in-situ magnesiothermic self-combustion synthesis in astatic argon atmosphere, using precursors of carbon, magnesium and either rice husk ash (RHA) or natural sand. Thedescription of the reaction involves initial the combustion reaction, the phase conversion through the product, and the coolingrate. The adiabatic temperature (Tad), the enthalpy of the reaction (ΔH) and the equilibrium composition of the reacting specieswere calculated. Pure Si-SiC powders were obtained by leaching with a solution of HCl: CH3COOH followed by HF : H2Osolution. Both the experimental results and the thermodynamic analysis indicated that the exothermic effect on the conversionof Mg2SiO4 had a large influence on the resultant Si-SiC composite.
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