| Popis: |
The use of sintering aids is quite common in the production of ceramic bodies. The effect of small additions of various oxide compounds such as SiO2, Al2O3, Li2O, Fe2O3, TiO2, ZrO2 and some halides such as LiF and LiC on the sintering of magnesium oxide has been studied in detail and has received wide attention. There is a general consensus regarding the way in which many of these additives operate, based on a mechanism where intergranular liquid phase are formed which can restrict grain growth, assist the grain-boundary sliding and accelerate mass transport during sintering. The aim of this study was to examine the possibility of adding TiO2 in quantities od 1, 2 nad 5 wt. % for reducting the boron content in the product, i. e. sintered magnesium oxide obtained from seawater. The purpose of this paper was, first, to reduce the B2O3 content in magnesium oxide from seawater as much as possible in order to ensure a high-purity product, because the hot-strength properties of certain refractory products are significantly affected by their boron content, and, second to sinter the individual products and determine the properties of samples sintered depending on the precipitation method and the boron content in the magnesium oxide. |
