Synthesis of nano-composite powder composed of silica and carbon and characteristic behavior at a high temperature thereof

摘要

A nano-composite powder composed of silica and carbon with a unique property could be prepared from a mixture of a silicate compound and an epoxy compound, in which the silica within the nano-composite powder has a BET surface area of as high as greater than 800 m2/g although the nano-composite powder has a BET surface area of less than 10 m2/g. It was estimated that the silica and the carbon are in a very finely and uniformly mixed state within the nano-composite powder and that the silica and the carbon form particles having a diameter of several tens nm and a number of silica particles having a diameter of several nm exist within the every particle of the nano-composite powder. It was demonstrated that the nano-composite powder exhibits characteristic behaviors under calcination at a temperature of 1450°C such that an amorphous state of the nano-composite powder is maintained, a large amount of gaseous reactant generates from the nano-composite powder, and a reaction product of SiC is synthesized in the presence of another ingredient.