Preparation of complex-shape SiC ceramic composites partsderived from phenolic resin template

Using phenolic resin as the raw material , complex-shaped component s , which were composed of SiC , Cand Si , were formed by stereolithography technology. X-ray diff raction was employed to analyze the phase of carbontemplates and ceramic components. The pyrolysis behaviors and the forming mechanism of the porous system werestudied with thermo-gravimet ric analysis. The microst ructures of the ceramic component s were observed with scanning elect ron microscope. A model of the mechanism of reactive infilt ration of Si into the carbon template was built .The carbon templates obtained by the pyrolysis of phenolic resin precursor possess amorphous state st ructures , andthe residual carbon is 65 wt %. The ceramic component s obtained at 1500 ℃ by reactive infilt ration of Si are denseceramics containing SiC , C and Si. At 1650 ℃the ceramics are porous ceramics. The porous system formed by photocurable resin st ructures and starch powders could effectively prevent the carbon templates from breaking andcracking and facilitate penet rating Si to the carbon templates to form SiC. The thickness of SiC obtained at 1500 ℃for 30 min is 20μm.