Effect of Mould Coatings on the Surface Defects in Ingots

Abstract

This work was carried out to obtain the information on the function of mould coatings most necessary to reduce surface defects in ingots.
Thermobalance and differential thermal analyses and small scale casting experiments were carried out so that splash boxes and splash like scabs could be related to the thermal decomposition temperature of mould coatings.
It is concluded that water soluble resin coatings cause so called rolling reaction of hot metal at the first stage of pouring and promote a smooth hot metal rise in the moulds and ingot surfaces appear to be the best.Coal tar and graphite of low and high thermal decomposition temperature are the causes of many surface defects in ingots.