%0 Journal Article
%T Densification studies of silicon carbide-based ceramics with yttria, silica and alumina as sintering additives
%A Marchi J.
%A Bressiani J.C.
%A Bressiani A.H.A.
%J Materials Research
%D 2001
%I ABM, ABC, ABPol, SBCC, SBCr, SBMM, SBPMat
%X Silicon carbide has been extensively used in structural applications, especially at high temperatures. In this work, Y2O3, Al2O3 and SiO2 were added to beta-SiC in order to obtain highly dense ceramics. Sintering was conducted in a dilatometer and in a graphite resistance furnace and the densification behaviour was studied. Sintered samples were characterised by density measurements, the crystalline phases were identified by X-ray diffraction. Microstructural observation of polished and polished/etched samples was carried out with help of scanning electron microscopy. Silicon carbide ceramics with more than 90% of the theoretical density were obtained by pressureless sintering if a suitable proportion of the additives is used.
%K silicon carbide
%K dilatometric studies
%K liquid phase sintering
%K additives
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392001000400002