Impact of Melt Phase Formation on the High-Temperature Behaviour of MgO–CMA–C Refractories
In order to further improve the properties to meet the requirements for even longer service life, highly reactive spinel-rich powder/aggregates (2,5 mass-%, 5 mass-%, and 7,5 mass-%) has been introduced in the composition consisting of common MgO-C in two different qualities with 3 mass-% C (after carbonisation), carbonised at 1400 °C. Melt phase formation is expected after carbonisation that could support the formation of a protective layer on the brick surface to protect the brick from slag penetration and the carbon from oxidation. Thus, the influence of this melt phase formation on the thermomechanical properties has been studied. Besides the thermomechanical properties CCS, HMOR, apparent porosity, and median pore diameter, the phase composition after carbonisation has been analysed.