Investigations Concerning Improvements of the Knock Out Property of Ceramic Moulds Applied in the Investment Casting Technology

• Autorzy: Kolczyk-Tylka Joanna , Zych Jerzy

Identyfikatory

DOI

10.24425/afe.2023.146676

• Języki publikacji: EN

Abstrakty

EN

In lost wax technology, self-supporting ceramic moulds are made, which must have adequate strength after being filled with liquid metal. The final structural strength is determined by such factors as the thickness of the individual layers applied to the wax model resulting from the viscosity of the liquid mass, the specific strength of the layers formed, and the heat treatment of the moulds. The development of technology and materials is moving in the direction of increasing the specific strength of self-supporting ceramic moulds. The consequence of this is that the final strength of these moulds is too high, making it difficult to knock castings out of the moulds. Removing mould remnants from holes, closed spaces of the casting, corners, sharp edges, variable cross sections and etc. is cumbersome. In order to remove mould remnants from the casting, a method is used to dissolve them in heated solutions of suitable chemical composition and reaction. The paper presents the results of research on a new solution, the essence of which is the production of layers in a ceramic mould, in the middle zone of the mould, characterized by a significantly reduced final strength, achieved after firing. These layers are produced using a different liquid ceramic mass than the base one, based on an organic binder. As a result, thanks to the embedded layer, very good knock-out of castings is achieved and separation of residual ceramic mass. Special layers can be incorporated over the entire surface or only in those places where the bonding of the casting surface and ceramic mass occurs.

Słowa kluczowe

EN

ceramic moulds; lost wax technology; knock-out properties; colloidal silica; wax models

PL

formy ceramiczne; metoda traconego wosku; krzemionka koloidalna; model woskowy

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2023
• Tom: Vol. 23, iss. 4
• Strony: 34--39
• Opis fizyczny: Bibliogr. 14 poz., il., rys., tab., wykr.

Twórcy

autor

Kolczyk-Tylka Joanna

• AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland

• https://orcid.org/0000-0003-2247-3282

autor

Zych Jerzy

• AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland

• https://orcid.org/0000-0003-3067-4316

Bibliografia

• [1] Małek, M. Wiśniewski, P., Matysiak, H., Ziwlinska, M. & Kurzydkowski, K. J. (2013). Yttrium (III) oxide application for manufacturing prime coat of ceramic shell moulds used in investment casting. Glass Ceram. 6,8-11.DOI: 10.13140/RG.2.1.1594.6002.
• [2] Matysiak, H., Ferenc, J., Lipiński, Z., Grabarz, K., Michalski J., & Kurzydłowski, K.J. (2009). Characterization and monitoring of technological parameters of ceramic slurries used in the investment casting process of aircraft turbine elements using the Bridgman technique. Inżynieria Materiałowa. 30(4), 239-244.
• [3] Wei-hua Liu, Xin Jia, Lai Song, & Ying-min Li. (2023). Effects of binder components and PVA modifier on bonding performance of phosphate binder for sand core-making. China Foundry. 20, 134-138. https://doi.org/10.1007/s41230-023-1021-1
• [4] Pattnaik, S.R. (2017). An investigation on enhancing ceramic shell properties using naturally available additives. The International Journal of Advanced Manufacturing Technology. 91, 3061-3078. https://doi.org/10.1007/s00170-016-9975-4.
• [5] Soroczyński, A., Haratym, R. & Biernacki, R. (2019). The role of recycled ceramic material obtained from the ceramic layered moulds used in the Investment Casting. Archives of Foundry Engineering. 19(1), 71-74. DOI: 10.24425/afe.2018.125194.
• [6] Karwiński, A. (2014). Technological parameters of the process of making molds of ceramic with the participation of Metallurgy in 2011-2014, (pp. 529-541), AKAPIT, Cracow. (in Polish).
• [7] Karwiński, A. & Żółkiewicz, Z. (2014). The research of properties of experimental ceramic layers. Archives of Metallurgy and Materials. 59(2), 703-705. DOI:https://doi.org/10.2478/amm-2014-0115.
• [8] Lu K, Liu X, Duan Z (2019). Effect of firing temperature and time on hybrid fiber-reinforced Shell for investment casting. International Journal of MetalCasting. 13, 666-673. https://doi.org/10.1007/s40962-018-0280-x.
• [9] Kolczyk, J., Zych, J. & Jamrozowicz, Ł. (2017). Influence of the Al2O3solid phase on the kinetics of binding ceramic moulds. Archives of Foundry Engineering.17(4), 91-96.DOI: 10.1515/afe-2017-0136.
• [10] Kolczyk, J., Zych, J. (2013). Kinetics of hardening and drying of ceramic moulds with the new generation binder – colloidal silica. Archives of Foundry Engineering.13(4), 112-116. DOI: 10.2478/afe-2013-0093.
• [11] Tabor, A., Rączka, J.S. (1998). Casting design and mold technology. Kraków: Fotobit.(in Polish).
• [12] Skarbiński, M. (1957). Casting construction. Warszawa: Państwowe Wydawnictwo Techniczne. (in Polish).
• [13] Pająk, J., Ziemski, M. & Nowak, B. (2010). Poly(vinyl alcohol) – biodegradable vinyl material. CHEMIK.64(7-8),523-530.(in Polish).
• [14] Rohini,Kumar,D.B., Rami,Reddy,M., Mulay,V.N., & Krishnamurti,N. (2000). Acrylic co-polymer emulsion binders for green machining of ceramics. EuropeanPolymer Journal.36(7), 1503-1510.DOI:10.1016/S0014-3057(99)00199-8.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024)