Per: Douglas santos silva (ime), raí felipe pereira junio (ime), lucas de mendonça neuba (ime), sergio neves monteiro (ime), marcelo henrique prado da silva (ime)
Abstract:
The incorporation of sintering additives in alumina (Al2O3) aims to improve the efficiency of the ceramic process and, consequently, the physical-chemical properties of the ceramic samples. In this work, the influence of the silica additive (SiO2) during the sintering of alumina was investigated, using weight concentrations of 2, 4 and 8% for silica in sintering heat treatment: 1500 °C, rate of 5 ºC/min, 1 h threshold. The samples were prepared by uniaxial cold pressing with an applied load of 2 tons. The ceramics obtained were sintered and their linear shrinkage was calculated. The flexural test was carried out and the modulus of rupture for the ceramics added with 2%, 4% and 8% silica were higher compared to the pure ceramic at 154%, 126% and 51%, respectively, a result ratified by the statistical analysis. The final morphology was observed by scanning electron microscopy (SEM).