Shrinkage silicon carbides

Therefore, to minimise the volume fraction of silicon carbide required for zero shrinkage, the green density p is to be made as high as possible. Using a mixture of SiC, Al and AI2O3, isostatically... 

At the present time, most of the work is centered on the development of silicon carbide and silicon-nitride powders. Polysilanes are the basic precursor for the synthesis of silicon carbide from sol-gel. This was first achieved by the conversion of polydimethyl silane through a carbosilane intermediate. However this silane has poor solubility and low char yield and considerable shrinkage occurs during conversion to the final product. Precursors are being developed with a much larger SiC yield notably those based on trifiinctional alkoxides and chlorosilanes. These materials are being evaluated for the production of powders.P JP l... 

---