Effect of Sand Base Grade and Density of Moulding Sands with Sodium Silicate on Effectiveness of Absorbing Microwaves

• Autorzy: Stachowicz M.

Identyfikatory

DOI

10.1515/afe-2016-0059

• Języki publikacji: EN

Abstrakty

EN

In the paper, presented is a research on effectiveness of absorbing electromagnetic waves at frequency 2.45 GHz by unhardened moulding sands prepared of three kinds of high-silica base and a selected grade of sodium silicate. Measurements of power loss of microwave radiation (Pin) expressed by a total of absorbed power (Pabs), output power (Pout) and reflected power (Pref) were carried-out on a stand of semiautomatic microwave slot line. Values of microwave power loss in the rectangular waveguide filled with unhardened moulding sands served for determining effectiveness of microwave heating. Balance of microwave power loss is of technological and economical importance for manufacture of high-quality casting moulds and cores of various shapes and sizes. It was found that relative density influences parameters of power output and power reflected from samples of moulding sand placed in a waveguide. Absorption expressed by the parameter Pabs is not related to granularity of high-silica base: fine, medium and coarse. It was found that the semiautomatic microwave slot line supports evaluation of effectiveness of microwave absorption on the grounds of power loss measurements and enables statistic description of influence of relative density of the sandmix on penetration of electromagnetic waves in unhardened moulding sands.

Słowa kluczowe

EN

foundry; microwaves; sodium silicate; high-silica sand; lossiness measurements

PL

odlewnia; mikrofale; krzemian sodowy; piasek kwarcowy

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2016
• Tom: Vol. 16, iss. 3
• Strony: 103--108
• Opis fizyczny: Bibliogr. 11 poz., rys., tab., wykr.

Twórcy

autor

Stachowicz M.

• Wroclaw University of Technology, Department of Foundry Engineering, Plastics and Automation, ul. Smoluchowskiego 25, 50-372 Wrocław, Poland

Bibliografia

• [1] Małachowska, A., Stachowicz, M. & Granat, K. (2012). Innovative microwave hardening of water-glass containing sandmixes in technical-economic approach. Archives of Foundry Engineering. 12(1), 75-80.
• [2] Stachowicz, M., Granat, K. & Małachowska, A. (2014). Comparison of classical methods and modern microwave to manufacturing cores from water-glass containing moulding sands. Archives of Foundry Engineering. 14(special 2), 83-88. (in Polish).
• [3] Stachowicz, M., Mażulis, J., Granat, K. & Janus, A. (2014). Influence of molding and core sands matrix on the effectiveness of the microwaves absorption. Metalurgija. 53(3), 317-319.
• [4] Stachowicz, M., Nowak, D. & Granat, K. (2012). Test stand to evaluate the effects of hardening of the moulding sands with water glass. Archives of Foundry Engineering. 12 (special 2), 53-58. (in Polish).
• [5] Nowak, D., Stachowicz, M. & Granat, K. (2013). Determination of the binder in sand molds with the use of microwaves.. Metalurgija. 52(2), 207-210.
• [6] Gąsiorski, A., Posyłek, Z. & Dróżdż, T. (2015). Microwave method for determining the moisture content of lignocellulosic solid fuels. Przegląd Elektrotechniczny. 91(12), 99-101 (in Polish).
• [7] Stachowicz, M. & Granat, K. (2013). Microwave absorption by unhardened molding sands with water-glass. Archives of Foundry Engineering. 13(special 1), 169-174. (in Polish).
• [8] Ahmad, M.S., Abdelazeez, M.K. & Zihlif, A.M. (1989). Microwave properties of the talc filled polypropylene. Journal Of Materials Science. 24, 1795-1800.
• [9] Stachowicz, M., Granat, K. & Więcławek, R. (2013). Evaluation of the microwave absorbing effectiveness by the selected molding sands matrixes. Archives of Foundry Engineering. 13 (special 1), 175-180.
• [10] Stachowicz, M., Granat, K. & Pałyga, Ł. (2016). Effect of sand wetting on physically hardened moulding sands containing a selected inorganic binder. Part 1. Archives of Foundry Engineering. 16(1), 73-78.
• [11] Stachowicz, M., Granat, K. & Pałyga, Ł. (2016). Effect of sand wetting on physically hardened moulding sands containing a selected inorganic binder. Part 2. Archives of Foundry Engineering. 16(1), 79-84.

Uwagi

PL

Opracowane ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.