Corrosion of refractory material under the action of forced convection flow by means of the rotating cylinder face area at 1500 °C

Abstract

The corrosion rates of various refractory materials in a container glass melt (sodium-calcium silicate basis) were determined quantitatively under the action of forced convection flow by means of the rotating cylinder face area at 1500 °C as compared with those at 1400 °C. The applied method not only gives a good comparison between the various types of bricks, but it also elucidates the influence of microstructure and of occasionally occuring crystalline or textural alterations during corrosion, which possibly can be detected only in experiments of extended duration. Present and earlier results on corrosion rates under the action of forced convection flow will be compared with those obtained from the same refractories under the action of free density and interfacial convection flows at 1400 and 1500 °C, which yield a very different dependence on temperature for the three convection flow types. The interfacial convection-driven corrosion shows the largest temperature dependence. Very critical are swelling effects, which sometimes can be observed only in separate long-time investigations.