Thermal Conductivity of Selected Ceramic Materials at a Transient Heat Flow

• Autorzy: Zych Jerzy , Wróbel Janusz , Mocek Jan , Myszka Maciej

Identyfikatory

DOI

10.35995/jame60010001

• Języki publikacji: EN

Abstrakty

EN

In this paper, we present comparative investigations. We examined two kinds of ceramic materials used to produce bricks for isothermal cleading of the riser heads of middle and large steel castings. The ceramic materials were characterised by a low specific density (No. 1 - p = 0.854 g/cm³; No. 2 - p = 0.712 g/cm³). Thermal conductivity tests at a transient heat flow were performed by analysing the heating process of samples taken from the tested ceramic bricks, placed in a special mould in which metal was poured, and by recording the cooling process of the casting. The method proposed in this paper for the determination of samples’ thermo-physical properties is based on measuring the temperature field of the casting–sample system by means of thermocouples situated in various measuring points; it allows the direct investigation of cooling and solidification processes of metals in sand moulds. The heating process of the ceramic samples was analysed by measuring the temperature in five points situated at various distances from the heating surface (casting–sample surface). A large difference in the heating rates of samples of different materials was revealed in our comparative investigations, which indirectly indicated the materials’ heat abstraction ability from the casting surface. The ceramic material characterised by a lower density much slowly conducted heat and, therefore, appeared to be a better material for insulation cleading. At the depth of 40.0 mm, we measured differences in the heating degree corresponding to more than 190°C. The aim of this comparative study was the evaluation of the suitability of porous insulating materials as cleading of riser heads used in the production of large steel castings.

Słowa kluczowe

EN

riser heads; insulation cleading; porous ceramic bricks

• Wydawca: Sieć Badawcza Łukasiewicz – Krakowski Instytut Technologiczny
• Czasopismo: Journal of Applied Materials Engineering
• Rocznik: 2020
• Tom: Vol. 60, iss. 1
• Strony: 3--11
• Opis fizyczny: Bibliogr. 11 poz., rys., tab.

Twórcy

autor

Zych Jerzy

• Department of Moulding Materials, Mould Technology and Cast Non-Ferrous Metals, Faculty of Foundry Engineering, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Wróbel Janusz

• Exact Systems, ul. Ferdynanda Focha 53/5, 42-200 Czestochowa, Poland

autor

Mocek Jan

• Department of Moulding Materials, Mould Technology and Cast Non-Ferrous Metals, Faculty of Foundry Engineering, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Myszka Maciej

• Department of Moulding Materials, Mould Technology and Cast Non-Ferrous Metals, Faculty of Foundry Engineering, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

• Banaszak, J. 2006. Wyznaczania współczynnika przewodzenia ciepła w materiałach porowatych. Materiały dydaktyczne. Available online: http://palmy.zameknet.pl/temperatury/dom%2002-21 (accessed on 15 December 2019).
• Binczyk, F., J. Kulasa, R. Przeliorz, and A. Smoliński. 2006. The definition of scanning calorimetric method the specific heat of the moulding sand. Archives of Foundry 6: 57–60.
• Ignaszak, Z. 2003. Substitute thermal conductivity coefficient for multi-component ceramic materials. Journal of Materials Processing Technology 143–44: 748–51.
• Kosowski, A. 2003. Metaloznawstwo i obróbka cieplna stopów odlewniczych. Kraków: Wydawnictwo Naukowe Akapit, p. 30.
• Lewandowski, J. L. 1991. Tworzywa na formy odlewnicze. Kraków: Wydawnictwo Naukowe Akapit.
• Longa, W. 1972. Krzepnięcie odlewów w formach piaskowych. Katowice: Wydawnictwo „Śląsk”.
• Longa, W., E. Urbanik, and W. Kapturkiewicz. 1978. Stygnięcie i krzepnięcie odlewów — Laboratorium. Skrypty Uczelniane AGH, Nr 623. Kraków: Wydawnictwa AGH.
• Pawłowski, Z. 1962. Wpływ składu masy formierskiej na jej przewodnictwo cieplne w wysokich temperaturach. Ph.D. thesis, AGH University of Science and Technology, Kraków, Poland.
• Szreniawski, J. 1968. Piaskowe formy odlewnicze. Warszawa: Wydawnictwa Naukowo-Techniczne.
• Technical Cards of Tested Bricks (names of producers hidden). 2018.
• Zych, J., J. Mocek, T. Snopkiewicz, and Ł Jamrozowych. 2015. Przewodność cieplna mas formierskich ze spoiwami chemicznymi, próby jej zwiększenia. Archives of Metallurgy and Materials 60: 351–57.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).