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In this paper, dense silicon carbide ceramics were prepared by aqueous gelcasting and pressureless sintering using dextrin as the carbon source. The influence of carbon content and solid content on the microstructure and mechanical properties of green and as sintered SiC samples was studied. It was shown that the carbon content should be 1wt% or higher for the fully densification of silicon carbide...
SiC ceramics were sintered in the temperature range of 1680–1880°C (at 40°C intervals) with and without powder bed to study the effect of powder bed on the densification process of liquid phase sintered SiC ceramics. The powder bed was found to play significant roles in inhibiting volatilization, reducing weight loss and keeping the microstructure uniform. Samples sintered with powder bed had relatively...
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