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Low-temperature synthesis of silicon carbide powder using shungite

2016; Elsevier BV; Volume: 56; Issue: 1 Linguagem: Inglês

10.1016/j.bsecv.2016.04.003

2173-0431

Agnieszka Gubernat, Waldemar Pichór, Radosław Lach, Dariusz Zientara, Maciej Sitarz, Maria Springwald,

Carbon Nanotubes in Composites

The paper presents the results of investigation the novel and simple method of synthesis of silicon carbide. As raw material for synthesis was used shungite, natural mineral rich in carbon and silica. The synthesis of SiC is possible in relatively low temperature in range 1500–1600 °C. It is worth emphasising that compared to the most popular method of SiC synthesis (Acheson method where the temperature of synthesis is about 2500 °C) the proposed method is much more effective. The basic properties of products obtained from different form of shungite and in wide range of synthesis temperature were investigated. The process of silicon carbide formation was proposed and discussed. In the case of synthesis SiC from powder of raw materials the product is also in powder form and not requires any additional process (crushing, milling, etc.). Obtained products are pure and after grain classification may be used as abrasive and polishing powders. Este trabajo presenta un método novedoso de obtención de carburo de silicio a partir de shunguita, mineral natural rico en carbono, y sílice. La síntesis se realiza a temperatura relativamente baja (1.500-1.600 °C) respecto a las temperaturas (∼2500 °C) requeridas en el método Acheson. Se describen la propiedades básicas de los productos obtenidos a partir de diferentes formas de shunguita y utilizando una amplia gama de temperaturas de síntesis. Se propone un proceso de formación del carburo de silicio. Cuando se obtiene el carburo de silicio a partir de materias primas en forma de polvo, el producto tiene también esta forma y no requiere ningún proceso adicional (trituración, molienda, etc.). Una vez clasificados los tamaños, el producto puede utilizarse directamente como abrasivo.