DefinePK

Abstract

The formation of a high-quality casting surface is a complex process, determined by the nature of an alloy filling, heating the mold, physicochemical and mechanical interaction of the melt with the atmosphere of the mold, in the contact zone material-mold. On the one hand, the filler of the anti penetration wash should not be wetted by alloys, on the other hand, to form properties in the liquid state, the filler should be well wetted by a solvent. At present, the most common solvent used in the anti penetration wash is water. The purpose of this work is to study wettability of graphite activated by various methods i.e. by water and water - based systems. In the course of the process it was found that activated GKM is wetted by water worse (wetting angle is 90-120° depending on the method of preparing GKM than natural graphite (wetting angle of water is 55°). It was revealed that activated graphite is better wetted by water-based binding systems: depending on the activation method (mechanical, chemical and chemical-mechanical) the wetting graphite angle by 10% LST solution decreases from 49 to 37°; by 3.5% water bentonite slurry - from 69 to 50°; by water-based binding system containing 10% LST and 3.5% bentonite - from 54 to 40º.