Síntesis de whiskers de SiC asistida por microondas

We developed a new process for the synthesis of SiC whiskers assisted by microwaves; this is based on the mixture of silica xerogels and graphite powder. As energy source were used microwaves of 2.45 GHz and 1.0 kW of power RMS. On the other hand, mesoporous silica was synthesized via sol-gel, the precursors used were TEOS/H₂O and ethanol. Throughanalysis of the BET is determined the value of averageporesize (3.0 nm) and the surface area (1090 m2/g).By mean of X-Ray diffraction it was demonstrated that the silica obtained is an amorphous solid and, the powders obtained in the microwave synthesis are β-SiC. Synthesized SiC powders were observed using a SEM in secondary electron mode, it was observed that this powders consists of SiC whiskers. The effect of microwaves on the synthesis of whiskers of SiC is discussed in the present work.<br><br>Se desarrolló un nuevo proceso para la síntesis de whiskers de SiC asistida por microondas, basada en la mezcla de xerogeles de sílice y grafito en polvo. Como fuente de energía se emplearon microondas de 2.45 GHz y 1.5 kW de potencia. La sílice mesoporosa se sintetizó vía sol-gel, los precursores usados para esta síntesis fueron TEOS/H₂O y etanol. A través del análisis BET se determinó el valor de tamaño de poro promedio (3.0 nm) y el área superficial (1090 m2/g). Mediante difracción de rayos-x método de polvos se demostró que la sílice sintetizada es amorfa y que los polvos obtenidos en el microondas corresponden a β-SiC. Para determinar la morfología de los whiskers de SiC se analizó por MEB en el modo de electrones secundarios. El efecto de las microondas en la síntesis de whiskers de SiC se discute en el presente trabajo.

Abstract licence: CC BY-NC-ND

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