Iron Oxide Additions

Additions of as little as 0.25% 200-mesh red iron oxide (Fe2O3 or hematite) inhibited the formation of all porosity in castings. Since commercial foundry grades of red iron oxide occur naturally, not all grades may work like the grades used in the experiments. Further, additions of Fe3O4 (magnetite) were not as effective as hematite (Table 3).
Table 3. Effect of Iron Oxide Type on Porosity Elimination

Table of contents
[Paper Header]
[Porosity Study]
[Binder Ratio] [Binder Level] [Casting Temperature] [Section Size]
[Sand Effect] [Iron Oxide Additions] [ Binder Dispersion/Mixing]
[Metal Composition] [Core Age]
[Eliminating Porosity]
[Ti and Zr Additions] [In-the-Mold Additions] [ Core Washes]
[Core Post-Baking]
[Discussion]