Dolomite-zirconia reaction sintered bonded coarse magnesia ceramics: effect of the bonding proportion

Refractory ceramic materials were manufactured, mainly composed of magnesia grains (coarse and medium fraction) CaZrO3/MgO as a binding phase produced from the reaction sintering between CaMg(CO3)2 (dolomite) m-ZrO2 (monoclinic zirconia), which constituted finer fraction. Different relationships proportion size different aggregates studied. The microstructure was characterized in terms density, crystalline phases, grain distribution, morphology. A combination X-ray diffraction analysis scanning electron microscopy with microanalysis used. mechanical behavior determined room temperature dynamic Young’s modulus 3-point bending rupture (MOR) at temperature. All remained porosities above 30%. developed similar sintered materials, MgO coarse bonded by CaZrO3/c-ZrO2 dispersed irregularly shaped pores. MOR directly related to fraction content composition, where higher quantity resulted MOR.