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Ceramic filters for bulk inoculation of nickel alloy castings

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Author(s): F. Binczyk | J. Śleziona | P. Gradoń

Journal: Archives of Foundry Engineering
ISSN 1897-3310

Volume: 11;
Issue: SI 3;
Start page: 29;
Date: 2011;
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Keywords: Nickel superalloys | Ceramic filter | Inoculation | CoAl2O4 inoculant | Compression strength | Density | Porosity

ABSTRACT
The work includes the results of research on production technology of ceramic filters which, besides the traditional filtering function, playalso the role of an inoculant modifying the macrostructure of cast nickel alloys. To play this additional role, filters should demonstratesufficient compression strength and ensure proper flow rate of liquid alloy. The role of an inoculant is played by cobalt aluminateintroduced to the composition of external coating in an amount from 5 to 10 wt.% . The required compression strength (over 1MPa) isprovided by the supporting layers, deposited on the preform, which is a polyurethane foam. Based on a two-level fractional experiment24-1, the significance of an impact of various technological parameters (independent variables) on selected functional parameters of theready filters was determined. Important effect of the number of the supporting layers and sintering temperature of filters after evaporationof polyurethane foam was stated.
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