Interactions at the mould - modifying coating - molten nickel alloy interface

• Autorzy: Binczyk F. , Śleziona J. , Gradoń P. , Michalska J. , Bąk S.
• Języki publikacji: EN

Abstrakty

EN

The study describes thermal-chemical interactions that take place in the molten nickel alloy-ceramic mould system, where the mould is either coated with a modifying coating ('blue' mould) or is not ('white' mould). The ceramic mould based on zirconium silicate was made by investment process at the WSK Rzeszów Foundry. The main component of the modifying coating was cobalt aluminate CoAl2O4 added in an amount of 10%. Thermodynamic calculations indicated the possibility of chemical reactions taking place between the chemically active nickel alloy constituents (Al, Ti, Hf, Ta and Nb) and the components of a ceramic mould and modifying coating. The result of such interactions is the risk of the formation of cracks on the surface of mould and molten metal penetration into these cracks, combined with the formation of casting defects, like burns-on, pitting, etc., as proved by extensive X-ray microanalysis. Changes of chemical composition in the surface layer of castings were also reported.

Słowa kluczowe

EN

nickel superalloy; chemical reaction; modification; thermodynamic potential; oxide

PL

nadstop niklu; modyfikacja; reakcja chemiczna; potencjał termodynamiczny; tlenek

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2011
• Tom: Vol. 11, iss. 3
• Strony: 5--10
• Opis fizyczny: Bibliogr. 11 poz., rys., tab., wykr.

Twórcy

autor

Binczyk F.

autor

Śleziona J.

autor

Gradoń P.

autor

Michalska J.

autor

Bąk S.

• Chair of Materials Technology, Silesian University of Technology, Krasińskiego Str. 8, 40-019 Katowice, Poland,

Bibliografia

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• [8] F. Binczyk, J. Śleziona: Macrostructure of IN-713C superalloy after volume modification, Archives of Foundry Engineering, vol. 9, Issue 2, 2009, pp.105-108.
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• [10] HSC Chemistry Ver.(4), Copyright (C), Outokumpu Research Oy, Pori, Finland, A. Roine.
• [11] F. Binczyk, J. Śleziona, J. Michalska: Analysis of thermal-chemical interactions at the ceramic mould - molten nickel alloy interface, Archives of Foundry Engineering, vol.10, Issue 4, 2010, pp.5-9.