The importance of materials properties in high-temperature processes

Abstract

In high temperature processes, physico-chemical properties of the phases involved have proved useful in identifying the mechanisms responsible for process problems and product defects. However, recently mathematical models have developed to the stage where they can now be used to identify these mechanisms. These models require reliable values for the thermo-physical properties for the various phases involved in the process. The thermo-physical properties of slags are very dependent upon slag structure. The factors affecting slag structure are outlined and the ways in which structural factors affect various physical properties are described. Finally, the manner in which the following properties (liquidus temperature; viscosity, surface and interfacial tension; thermal conductivity and enthalpy) can be manipulated to optimise process control and product quality is demonstrated for various industrial processes.