Densification studies of silicon carbide-based ceramics with yttria, silica and alumina as sintering additives

AUTOR(ES)

Marchi, J., Bressiani, J.C., Bressiani, A.H.A.

FONTE

Materials Research

DATA DE PUBLICAÇÃO

2001-10

RESUMO

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.

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