Synthesis of Silicon Carbide from Coked Rice Hulls and Coked Bamboos.

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概要

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• Silicon carbide is an important industrial material as used for high-temperature ceramics. In the present study silicon carbide powders were synthesized at different temperature (1, 250-1, 400°C) by reaction of a mixed power of shirasu and coked rice hulls or coked bamboos. The results are summarized as follows;<BR>(1) Two kinds of shirasu are used as the source of Si0<SUB>2</SUB>, one mainly consists of volcanic glass and the other includes volcanic glass and crystalline materials, such as feldspar and quartz. Coked rice hulls contain large amounts of unburnt component, but coked bamboos include a very small amount of one.<BR>(2) Pure powders of silicon carbide are synthesized from shirasu and coked bamboos under relatively low temperature as compared with synthetic conditions of β- silicon carbide on the market.<BR>(3) The structural and quantitative analyses of the synthesized silicon carbide were carried out using the X-ray powder diffraction refinement method on the basis of the cubic and hexagonal close packed models. The profile calculated on the basis of Paterson model shows that the peak of (102) reflection moves toward the lower angle with increasing the amount of stacking faults, however, in the case of Wilson model the peak position of (102) reflection does not move any more with increasing the stacking faults. The content of the stacking faults in the present synthesized silicon carbide is very small as compared with that of silicon carbide on the sail.

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