Core Washes
Experimental core washes were applied to cores to determine effectiveness as porosity inhibitors. Red iron oxide-bearing washes provided slight or no reduction in porosity defects. Experimental washes of aluminum and Ti powder provided similar performance.
A 100% red iron oxide wash and another prepared with sodium silicate and iron oxide completely prevented porosity, however these castings exhibited severe surface finish degradation. The sodium silicate red iron oxide wash deteriorated the casting surface slightly, but the 100% red iron oxide wash had a deleterious effect.
Results indicated that adequate amounts of iron oxide were not employed in washes; however, in experimental washes with red iron oxide, too much was added with a resultant loss in surface smoothness.
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