Preparation of biomorphic SiC ceramics

This paper deals with a new method for producing non-oxide ceramic using wood as a template. SiC with a woodlike microstructure has been prepared by carbothermal reduction reactions of Tilia wood/TEOS composite at 1873K. The porous carbon preform was infiltrated with TEOS (Si(OC2H5)4), as a source of silica, without pressure at 298K. The morphology of resulting porous SiC ceramics, as well as the conversion mechanism of wood to SiC ceramics, have been investigated by scanning electron microscopy (SEM/EDS) and X-ray diffraction analysis (XRD). Obtained SiC ceramics consists of ?-SiC with traces of ?-SiC. U ovom radu prikazano je dobijanje neoksidne keramike koristeci drvo kao 'sablon'. SiC keramika, mikrostrukture drveta, je dobijena reakcijom karbotermalne redukcije kompozita drvo Lipe/TEOS na temperaturi od 1873K. Porozni ugljenicni prekursor je infiltriran sa TEOS-om, kao izvorom silike, na temperaturi od 298K, bez pritiska. Morfologija dobijene porozne SiC keramike, kao i mehanizam konverzije drveta u SiC keramiku, okarakterisani su pomocu rendgenske difrakcije (XRD) i skenirajuce elektronske mikroskopije (SEM/EDS). Dobijena SiC keramika se sastoji od ?-SiC sa tragovima ?-SiC.