Abstract:
The present study had proposed to investigate the sintering process product with a Brazilian-made αlfa-SiC with a mixture of the biphasic Al2O3-YAG composite as additive. The additive was used in concentration of 10wt%. The mixtures were milled, deagglomerated, sieved and uniaxially and isostatically pressed under 30 and 200 MPa. Sintering reactions were carried out at 1800 e 1900 ºC, for 30 min, in argon atmosphere. The SiC sintered with the additive within this study were characterized by X-ray diffraction with phase quantification by Rietveld method. The samples show high densities, above 93%, and low superficial porosity, around 2.67%. The results of shrinkage and weight loss presented great values, such as 48.45% and 12.12%, respectively. These factors indicate that the results are quite promising compared within references found in the literature, showing the biphasic composite as a stable additive material, confirmed by phase quantification.