Investigation of thermal processes during test operation of ingot mould with composite surface layer

The paper presents a method of usable properties of surface layers improvement of grey cast iron EN-GJL-200 ingot mould, by put directly in founding process a composite surface layer on the basis of corundum Al2O3 and quartz sand SiO2. Technology of composite surface layer guarantee mainly increase in hardness and abrasive wear resistance of cast steel and cast iron castings on machine elements. This technology can be competition for generally applied welding technology (surfacing by welding and thermal spraying). The results of studies show, that is positive influence of composite surface layer with ceramic particles on increase in life of cast iron ingot moulds.