This paper presents the experimental analysis of
porosity in gray iron castings poured with cores prepared with
Phenolic urethane no-bake binders. The data for analysis were
obtained by altering the casting parameters such as binder
ratio, binder level, casting temperature, section size, mixing
effect, metal composition, addition of Titanium, Zirconium,
Iron oxide, core washes and core post-baking on porosity
formation in gray iron castings. Results obtained showed that
pouring temperature above 1482oC, poor binder dispersion
and use of binder ratio favouring higher level of polyisocyanate
component of the binder promotes porosity.
However the additions of 0.25% red iron oxide (Fe2O3),
0.025% Titanium and 0.05% Zirconium were also effective in
eliminating porosity just as core post-baking and the use of
core coating modified with red iron oxide. This result will help
metal casters to reduce porosity defects in gray iron castings
when they are poured with cores prepared with Phenolic
urethane no-bake binders.

How to Cite
UMEZURIKE, C.; ONCHE, W.O.. Experimental Analysis of Porosity in Gray Iron Castings. Global Journal of Research In Engineering, [S.l.], v. 10, n. 7, dec. 2010. ISSN 2249-4596. Available at: <https://engineeringresearch.org/index.php/GJRE/article/view/117>. Date accessed: 25 may 2019.