[1] R. Voytovych, V. Bougiouri, N. R. Calderon, J. Narciso, N. Eustathopoulos, Reactive infiltration of porous graphite by NiSi alloys, Acta Mater. 56 (2008) 2237–2246. [2] B. Drevet, N. Eustathopoulos, Wetting of ceramics by molten silicon and silicon alloys: a review, Journal of Materials Science 47 (2012) 8247–8260. [3] M. Naikadea, B. Fankhänel, L. Weber, A. Ortona, M. Stelter, T. Graule, Studying the wettability of Si and eutectic Si-Zr alloy on carbon and silicon carbide by sessile drop experiments, J- Eur. Ceram. Soc., 39 (2019) 735-742. Conclusions Wetting behavior and reactivity of liquid Si-10Zr alloy in contact with Glassy Carbon and SiC Donatella Giuranno1, Adelajda Polkowska2, Wojciech Polkowski2, Grzegorz Bruzda2, Enrica Ricci1, Rada Novakovic1 1Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council, CNR-ICMATE, Via De Marini 6, 16149, Genova, Italy 2Foundry Research Institute, ul. Zakopianska 73, Krakow, Poland donatella.giuranno@ge.icmate.cnr.it Acknowledgements The NCN-National Science Center, Poland is greatly acknowledged for the financial support through the POLONEZ project number UMO-2016/23/P/ST8/01916. This project was carried out under POLONEZ-3 program which has received funding from European Union’s Horizon 2020 research and innovation program under Marie Skłodowska-Curie grant agreement. No 665778. Materials Science Materials Design MexSiy SiC Impact Currently, the main challenges facing the development of advanced refractory MMCs (SiC- ZrSi2) and CMCs (C/C-ZrC-SiC) are related to the costly fabrication of tailored and performant interfaces microstructures for highly demanding applications, to optimize the fabrication process and to identify ad-hoc the metal matrix for each application. Goal Aiming to ‘‘mimic’’ the conventional operating conditions imposed in fabricating MMCs via liquid assisted processes such as reactive infiltration, the contact heating sessile drop method (CHSD) was applied for better understanding the interaction phenomena occurring between the liquid Si-10at%Zr alloy in contact with Glassy Carbon (GC) and SiC substrates. Specifically, the contact angles behaviors as a function of time were obtained over the temperature range of T = 1354-1500°C under an Ar atmosphere. Why? Fundamental investigations performed under well-defined operating conditions on the occurring interfacial phenomena between liquid Si-Zr alloys in contact with C and SiC substrates, are key steps for optimizing liquid assisted processes (reactive infiltration). Targeted wettability and reactivity studies can easily provide useful indications for solving many technological problems affecting the reactive infiltration mechanisms, such as pore closure/narrowing phenomena. Introduction Computational models are enabling the design and manufacture of costless and high quality advanced complex metal-based materials such as SiC-based composites, since longer gaining interest for the use in aerospace, automotive, defense, nuclear reactors and various other engineering applications. In particular, the production of tailored SiC-based composites via reactive infiltration of Si-based alloys into C-and SiC-based preforms, mainly by assisting computational simulations, is currently one of the main goals of materials design. T ≤ 1700°C, 1 Ptot 10-6 mbar C-heater acting as O2-getterSi-Zr Phasediagram ZrSi2 ZrSi2 Si-8.6at%Zr 20 mm 20 mm Si-10at%Zr as-cast Arc melting 1 mm W ≈ 50 - 60 mg Glassy Carbon (GC) Alfa Aesar, Ra ≈ 20 nm HP SiC (SiC) Goodfellow, Ra ≈ 1mm 3D Profilometer/confocal optical microscope Substrates Sample C-tube Coil Water-cooling CCD Camera Pyrometer Heating rate ≤ 15/s, Cooling rate = 20/s Thermocouples/Pyrometer Real-time residual gas analysis Real-time acquisition data (ASTRAview) CCD camera Feed GAS HV Pump MV Pump Water cooled quartz tube CoilExperimentalset-up Materials & Method SEM/EDX analyses (top drop) of Si-10Zr/GC couples after wetting tests at T = 1354-