Evaluation of Microwave Heating of Protective Coatings Used in the Lost Foam Technology

Open access

Abstract

Presented are results of a preliminary research on determining a possibility to use microwave radiation for drying casting protective coatings applied on patterns used in the lost foam technology. Taken were measurements of permittivity ετ and loss factor tgδ at 2.45 GHz, as well as attempts were made of microwave drying of a protective coating based on aluminium silicates, applied on shapes of foamed polystyrene and rigid polymeric foam. Time and results of microwave drying were compared with the results obtained by drying at 50 °C by the traditional method commonly used for removing water from protective coatings. Analysis of the obtained drying kinetics curves demonstrated that selection of proper operation parameters of microwave equipment permits the drying time to be significantly shortened. Depending on kind of the pattern material, drying process of a protective coating runs in a different way, resulting in obtaining different quality of the dried coating.

[1] Lewandowski, L. (1997). Materials for molds. Kraków: Akapit. (in Polish)

[2] Pacyniak, T. (2013). Loss foam method. Selected problems. Łódź: Editorial Office of Lodz University of Technology (in Polish).

[3] Seeger, K. (2012). Application of aqueous coatings at manual moulding. Foundry Review. 62 (7-8), 322-326. ISSN 0033-2275 (in Polish).

[4] Nwaogu, U.C. & Tiedje, N.S. (2011). Foundry coating technology: a review. Material Sciences and Application. 2, 1143-1160. DOI:10.4236/msa.2011.28155.

[5] Jamrozowicz, Ł. Zych, J. & Kolczyk, J. (2015). The drying kinetics of protective coatings used on sand molds. Metalurgija. 54 (1), 23-25. ISSN 0543-5846

[6] Pacyniak, T. (2008). The effect of refractory coating permeability on the lost foam process. Archives of Foundry Engineering. 8 (3), 199-204. ISSN (1897-3310).

[7] Holtzer, M. Bobrowski, A. Drożyński, D. & Mocek, J. (2013). Selection of protective coatings of moulds for castings of high-manganese cast steel in dependence of the applied moulding sand kind. Archives of Metallurgy and Materials 58 (3), s. 853-857. DOI: 10.2478/amm-2013-0101.

[8] Kowalski, S.J. Rajewska, K. Rybicki, A. (2005). Physical basics of microwave drying. Poznań: Editorial Office of Poznan University of Technology (in Polish).

[9] Mujumdar, S.A. (Ed.) (1995). Handbook of Industrial Drying . New York: Marcel Decker.

[10] Granat, K. Opyd, B. Stachowicz, M. Nowak, D. & Jaworski, G. (2013). Usefulness of foundry tooling materials in microwave heating process. Archives of Metallurgy and Materials. 58 (3), 919-922. DOI: 10.2478/amm-2013-0101.

Archives of Foundry Engineering

The Journal of Polish Academy of Sciences

Journal Information


CiteScore 2016: 0.42

SCImago Journal Rank (SJR) 2016: 0.192
Source Normalized Impact per Paper (SNIP) 2016: 0.316

Metrics

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 113 108 3
PDF Downloads 51 46 4