Effects of Temperature and Catalyst Type on the Synthesis of SiC Whiskers from Rice Husk Powders
SiC whiskers were synthesized by the catalytic method using rice husk powder as the raw material and cobalt nitrate and iron nitrate as catalysts,investigating the effects of heat treatment temperature and catalyst type on the content and morphology of the synthesized SiC whiskers. The findings indicate that,under the catalysis of nickel nitrate or iron nitrate,1200℃ is the temperature transition point for the synthesis of SiC from rice husk. The increase in heat treatment temperature facilitates the reaction between SiO2 and C in rice husk and increases the formation and grain size of SiC whiskers. Compared to the addition of cobalt nitrate,the addition of iron nitrate is favorable to increasing the amount of SiC whiskers while also resulting in a larger aspect ratio for the whiskers,which primarily adhere to a VS growth mechanism.
SiC whiskersRice husk powdersCatalytic methodMicrostructure
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