Effect of TiO 2, SiO 2 and Al 2O 3 on properties of sintered magnesium oxide from sea water

Abstract

The process of isothermal sintering of magnesium oxide obtained from sea water (by precipitation with 80% and 120% of the stoichiometric quantity of the calcined dolomite and magnesium oxide p.a. (pro analysi purity grade) ) was examined with the addition of SiO 2, Al 2O 3 and TiO 2, at temperatures in the range 1300–1800 °C. The process was followed by determining the product density, as well as densification of the compacts. With compacts containing SiO 2 or Al 2O 3 densification was examined in relation to the sintering temperature and quantity of the sintering aid; with compacts containing TiO 2 densification was examined in relation to the sintering temperature and pressing pressure. Sample densification and pore removal during isothermal sintering have been shown to be a function of the exponent α in the expression (Δ V/V 0) − m = τ α . The specific surfaces, chemical compositions and particle size distribution were determined for the magnesium oxide samples examined.