Surface and bulk properties of liquid Si-M alloys (M = Co, Ti, Zr)
Creators: name: Giuranno Donatella
name: Novakovic Rada
name: Bruzda Grzegorz
name: Nowak Rafal
name: Polkowski Wojciech
name: Polkowska Adelajda
name: Kudyba Artur
name: Sobczak Natalia
Publisher: name: Zenodo
Year: 2020

description: Computational models are powerful tools for materials design. Since longer time, SiC-based composites gain interest for their potential use in aerospace, automotive, and other highly demanding applications. In particular, the production of tailored SiC-based composites via reactive infiltration of Si-based alloys into C- and SiC-based preforms, mainly assisted by computational simulations, is currently one of the main goals of materials design. However, simulation successfully proceeds if accurate, self-consistent, and reliable thermophysical properties data of the infiltrating phase are used as input data [1]. For molten Si-based alloys, such data are either lacking or quite scarce and even contradictory due to the high reactivity of the liquid phase significantly pronounced at high temperature [2]. Recently, quasi-containerless methods such as pendant drop, have paved the way for limited contact measurement methods allowing precise determination of surface and bulk properties. Indeed, using the pendant drop method, the surface tension and density of Si-alloys can be accurately measured [3, 4]. Measurements of the surface tension and density of Si-rich Si-Me alloys (Me = Co, Ti, Zr) have been carried out by the pendant drop method in the temperature range of (T<sub>m</sub>+20)÷1500°C. The results obtained have been discussed in terms of alloying element (Me), operating conditions and even considering various phenomena at the liquid/vapour and liquid/solid interfaces under dynamic scenarios, i.e. segregation, reactivity, evaporation, etc. For these reasons, the results have been analyzed by means of different thermodynamic models, e.g. Ideal solution, Quasi-Chemical Approximation (QCA) for regular solution applied to the base Si-Me systems [2, 3]. Finally, a fluidodynamic study related to O-transfer phenomena occurring at the liquid/vapour interface has been also done [4]. <strong>Acknowledgment</strong> The work performed was supported by National Science Center of Poland through POLONEZ project number UMO-2016/23/P/ST8/01916. This project is 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. <strong>REFERENCES</strong>: [1] M. Caccia, J. Narciso, Key parameters in the manufacture of SiC-based composite materials by reactive melt infiltration, Materials 12 (15) (2019) 2425. [2] R. Novakovic, D. Giuranno, M. Caccia, S. Amore, R. Nowak, N. Sobczak, J. Narciso, E. Ricci, Thermophysical properties of liquid Co-Si alloys, J. Mol. Liq. 221 (2016) 346–353. [3] D. Giuranno, E. Ricci, R. Nowak, N. Sobczak, Surface tension of high melting metals by PD/SD combined method, High Temp High Press. 40 (2011) 215-223. [4] D. Giuranno, E. Arato, E. Ricci, Oxidation conditions of pure liquid metals and alloys, Chem. Eng. Trans., 24 (2011) 571-576.
description: The work performed was supported by National Science Center of Poland through POLONEZ project number UMO-2016/23/P/ST8/01916. This project is 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.