It is established that SiC obtained through the carbidization of rice husk inevitably contains unreacted carbon, since the C/SiO2 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 SiO2 with sodium silicate in the hydrothermal carbonization process.
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Translated from Poroshkovaya Metallurgiya, Vol. 54, Nos. 3–4 (502), pp. 111–116, 2015.
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Korablev, S.F., Korablev, D.S. Physicochemical Features in the Synthesis of Nanostructured Sіc Under Nonisothermal Heating from Hydrothermally Carbonized Rice Husk. II. Production of SiC Without Carbon Impurities. Powder Metall Met Ceram 54, 215–219 (2015). https://doi.org/10.1007/s11106-015-9702-y
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DOI: https://doi.org/10.1007/s11106-015-9702-y