Physicochemical Features in the Synthesis of Nanostructured SіC under Nonisothermal Heating from Hydrothermally Carbonized Rice Husk.
II. Pro-duction of SiC without Carbon Impurities

Abstract

It is established that SiC obtained through the carbonization of rice husks inevitably contains unreacted carbon, since the C/SiО₂ ratio in the starting material is 36% higher than the stoichiometric one. Two methods are proposed for producing SiC without carbon impurities. One is to conduct additional oxidative annealing at 770 °C, and the other is to introduce an additional amount of SiО₂ as sodium silicate in the hydrothermal carbonization process.