Tailored light-weighting composites by Si-Ti-C system: Experimental and theoretical considerations
Creators: name: Giuranno Donatella
name: Gambaro Sofia
name: Mocellin Francesco
name: Novakovic Rada
name: Bruzda Grzegorz
name: Nowak Rafal
name: Polkowski Wojciech
name: Polkowska Adelajda
name: Warmuzek M
name: Kudyba Artur
name: Sobczak Natalia
name: Javier, Narciso
Publisher: name: Zenodo
Year: 2020

description: Light-weight materials capable of bearing load have become increasingly valuable for designing, construction and assembling of lightweight transportation systems such as aircraft, high-speed trains and satellites. To produce competitive advanced MMCs, SiC- and C<sub>f</sub>/C-based composites with desirable properties, the reactive infiltration process has advantages over other conventional processing techniques. Currently, three are the greatest open challenges for scientists: theoretical description of the process by computational models, unreacted Si-replacement and “control” of the “pore closure” phenomenon. Key inputs come from the basic know-how on wetting characteristics and reactivity [1], surface properties and thermodynamics. The interfacial phenomena occurring when liquid Si-Ti alloys are in contact with Glassy Carbon and SiC have been studied. Specifically, five different Si-Ti alloys: both the Si-86at%Ti and Si-16%atTi eutectics, the hypo Si-24at%Ti and hypereutectic Si-8%Ti alloys, as well as the TiSi<sub>2</sub> intermetallic compound have been selected. Wettability, spreading kinetics, reactivity, surface and bulk properties (surface tension and density) as a function of the operating conditions (time, temperature, method) over the temperature range of (T<sub>m</sub>+20)÷1500°C have been estimated. The microstructural evolution at the interface have been analyzed by LM, SEM-EDS even at high resolution. In parallel, the results on the surface and bulk properties have been compared with the model predicted values obtained by Ideal solution, Quasi-Chemical Approximation (QCA) for regular solution models [2]. Using basic “know-how” tools, the fabrication and joining of SiC- and C<sub>f/</sub>C composites via reactive infiltration of Si-Ti alloys will be presented [3]. <strong>Acknowledgments</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] D. Giuranno, N. Sobczak, G. Bruzda, R. Nowak, W. Polkowski, A. Kudyba, A. Polkowska, R. Novakovic, Met. Mat. Trans. A, 50 (10) (2019) 4814-4826. [2] R. Novakovic, D. Giuranno, M. Caccia, S. Amore, R. Nowak, N. Sobczak, J. Narciso, E. Ricci, J. Mol. Liq. 221 (2016) 346–353. [3] D. Giuranno, N. Sobczak, G. Bruzda, R. Nowak, W. Polkowski, A. Polkowska, A. Kudyba, R. Novakovic, J. Materi. Eng. Perform. (2020), https://doi.org/10.1007/s11665-020-04655-7
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.