Determination of Duration and Sequence of Vacuum Pressure Saturation in Infiltrated MMC Castings

• Autorzy: Gawdzińska K. , Nagolska D. , Szymański P.

Identyfikatory

DOI

10.24425/118806

• Języki publikacji: EN

Abstrakty

EN

The paper presents a detailed description of one of the newest methods of vacuum saturation of reinforcing preforms in gypsum molds. As an appropriate selection of the infiltration time is a crucial problem during realization of this process, aim of the analysis shown in the paper is to present methods of selection of subatmospheric pressure application time, a sequence of lowering and increasing pressure, as well as examining influence of structure of reinforcing preforms on efficiency of this process. To realize the aim, studies on infiltration of reinforcing preforms made of a corundum sinter of various granulation of sintered particles with a model alloy were conducted. The infiltration process analysis was carried out in two stages. The first stage consisted in investigation of influence of lengthening of sucking off air from the reinforcing preforms on efficiency of this process. In the second stage, an analysis of influence of a two-staged infiltration process on saturation of the studied materials was conducted. Because the studied preforms were of similar porosity, the obtained differences of the saturation level of particular preforms have shown, that the saturation process is influenced mostly by size of pores present in the reinforcement. Because of these differences, each reinforcement type requires individual selection of time and sequence of the saturation process. For reinforcements of higher pore diameter, it is sufficient to simply increase air sucking off time to improve the saturation, while for reinforcement of smaller pore diameter, it is a better solution to apply the two-staged process of sucking off air. Application of the proposed analysis method allows not only obtaining composite castings of higher quality, but also economical optimization of the whole process.

Słowa kluczowe

EN

MMC; saturation; process parameters; time of infiltration; gypsum mold

PL

MMC; nasycenie; parametry procesu; infiltracja; forma gipsowa

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2018
• Tom: Vol. 18, iss. 1
• Strony: 23--28
• Opis fizyczny: Bibliogr. 11 poz., fot., rys., tab., wykr.

Twórcy

autor

Gawdzińska K.

• Maritime University of Szczecin, Faculty of Marine Engineering, Szczecin, Poland

autor

Nagolska D.

• Poznan University of Technology, Institute of Materials Technology, Poznań, Poland

autor

Szymański P.

• Poznan University of Technology, Institute of Materials Technology, Poznań, Poland

Bibliografia

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• [3] Naplocha, K.& Granat, K. (2014). Manufacturing of porous al-cr preforms for composite reinforcing using microwave activated combustion synthesis. Archives of Metallurgy and Materials. 59, 1125-1127.
• [4] Sobczak, J., Wojciechowski A., Rudnik, D. (2008). Pressure infiltration in the production of composite materials, Analytical and Literature Studies (Infiltracja ciśnieniowa w wytwarzaniu materiałów kompozytowych, Studium Analityczno-literaturowe). Warszawa: Wydawnictwo Instytutu Transportu Samochodowego. (in Polish).
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• [8] Dolata, A.J. (2016). Centrifugal infiltration of porous ceramic preforms by the liquid Al alloy - theoretical background and experimental verification. Archives of
• Metallurgy and Materials. 61(1), 411-418. DOI: 10.1515/amm-2016-0075.
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• [10] Szweycer, M. (1996). Surface phenomena in foundry processes (Zjawiska powierzchniowe w procesach odlewniczych). Kraków: Wydawnictwo Instytutu Odlewnictwa. (in Polish).
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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).