Constituent Compatibility and Microstructural Stability

Mileiko, S.T.

doi:10.1016/b0-08-042993-9/00129-7

Cited by 10 publications

(8 citation statements)

References 88 publications

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“…Currently, SiCp (reinforced SiC particles), SiC/SiC f , and C f /SiC composites that are densified or filled by Si-based alloys and transition metal silicides are gaining great interest as thermal barriers, structural materials, and components for assembling re-entry space vehicles and fission/fusion nuclear reactors for their low density, remarkable hardness, chemical inertness, improved electrical and thermal stability, and excellent oxidation resistance, mainly at high temperatures [1][2][3][4][5][6][7][8]. For instance, refractory alloys and silicides, such as Zr-based alloys and Zr combined with Si, are already used as cladding materials for nuclear reactors due to their ultra-high neutron capture cross sections and an excellent long-term resistance under irradiation [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Interfacial Phenomena between Liquid Si-rich Si-Zr Alloys and Glassy Carbon

et al. 2020

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To succeed in the design and optimization of liquid-assisted processes such as reactive infiltration for the fabrication of tailored refractory SiC/ZrSi 2 composites, the interfacial phenomena that occur when Si-rich Si-Zr alloys are in contact with glassy carbon (GC) were investigated for the first time by the sessile drop method at T = 1450 • C. Specifically, two different Si-rich Si-Zr alloys were selected, and the obtained results in terms of wettability, spreading kinetics, reactivity, and developed interface microstructures were compared with experimental observations that were previously obtained for the liquid Si-rich, Si-Zr, near-eutectic composition (i.e., Si-10 at.%Zr) that was processed under the same operating conditions. The increase of the Si content only weakly affected the overall phenomena that were observed at the interface. From the practical point of view, this means that even Si-Zr alloys with a higher Si content, with respect to the near eutectic alloy, may be potentially used as infiltrant materials.

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Section: Introductionmentioning

confidence: 99%

Interfacial Phenomena between Liquid Si-rich Si-Zr Alloys and Glassy Carbon

et al. 2020

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“…CO2 (g) + C(s)  2CO (g) (6) In particular, under thermodynamic considerations, at the testing temperature of T = 1450°C, the reaction 4 is one of most favoured. In addition, if the mentioned reactions are concomitant with the release of SiO monoxide, as mentioned above typically occurring during the SiO2 decomposition, the following reactions may take place:…”

Section: Discussionmentioning

confidence: 99%

“…At the present, SiC/SiCf, Cf/SiC and SiCp (SiC particles reinforced) composites densified or filled by Si-based alloys as well as transition metal silicides, are gaining great interest as thermal barriers and structural materials or components for assembling re-entry space vehicles and fission/fusion nuclear reactors for their low density, remarkable hardness, chemical inertness, high electrical and thermal stability, excellent resistance to oxidation, particularly at high temperatures [1][2][3][4][5][6][7][8]. For instance, refractory alloys and silicides, such as Zr-based alloys and Zr combined with Si are already used as cladding materials for nuclear reactors because of their ultra-high neutron capture cross sections and an excellent long-term resistance under irradiation [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Interfacial Phenomena between Liquid Si-Rich Si-Zr Alloys and Glassy Carbon

Giuranno

Polkowski

Bruzda

et al. 2020

Preprint

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To design and optimize liquid-assisted processes such as reactive infiltration for fabricating refractory SiC/ZrSi2 composites, basic investigations on the interfacial phenomena occurring when liquid Si-based alloys are in contact with C and SiC substrates, are key steps. Indeed, targeted wettability studies may provide helpful indications for finding the suitable set of operating conditions to succeed the fabrication of composites via the reactive infiltration and for predicting the key influencing mechanisms. The wettability of glassy carbon (GC) by two different Si-rich Si-Zr alloys as a function of the Si-content has been investigated by the sessile drop method at T = 1450°C. The more relevant results obtained in terms of equilibrium contact angle values, spreading kinetics, reactivity and developed interface microstructures are reported in the paper and compared with the behaviour previously observed in the Si-27Zr/GC system. The increase of Si-content only weakly affected the overall phenomena observed at the interface, which from the practical point of view means that even the Si-Zr alloys with higher Si-content, as respect to the eutectic alloy (Si-27Zr), could be potentially used as infiltrant materials.

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“…Aiming to achieve the complete alloy homogenization by melting TiSi2 precipitates (Figure 1d), the metal material inside the capillary was overheating up to 1500°C for a few minutes, then the testing temperature of T = 1450°C was imposed and the alloy squeezed on the GC plate. Figure 6 shows the time sequence of the more relevant images recorded during the alloy squeezing from the capillary (1-4), the melt deposition on the GC substrate (5-7) and the wetting test (8)(9)(10)(11). Although the image recording rate was 10 frames/s, just after the alloy detachment from the capillary, a contact angle value of   37° was shown at the newly formed Si-24at%Ti/GC interface and the mentioned value was kept constant until the end of the experiment (t = 15 min), as shown in Figure 6.…”

Section: Wettability Of Gc By Si-24at%ti Alloys As a Function Of The Testing Methodsmentioning

confidence: 99%

“…For aerospace and light weight transportation applications, today the most extensively studied CMCs are reinforced by C-and SiC fibers (Cf and SiCf, respectively), namely Cf/C, Cf/SiC, SiCf/SiC and Cf/C-SiC composites, as well as SiCp (SiC particles as reinforcement) [1,3,4,[7][8][9][10][11][12]. Despite the manufacturing processes of fibers and reinforcements have reached a high level of reproducibility, their use is limited by the costs and technological problems encountered in producing successfully large and complex CMCs shapes.…”

Section: Introductionmentioning

confidence: 99%

Interfaces Design in Lightweight SiC/TiSi2 Composites Fabricated by Reactive Infiltration Process: Interaction Phenomena between Liquid Si-rich Si-Ti Alloys and Glassy Carbon

Giuranno¹,

Gambaro²,

Bruzda³

et al. 2021

Preprint

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To design properly and optimizate liquid-assisted processes such as reactive infiltration for fabricating light weight and corrosion resistant SiC/TiSi2 composites, the interfacial phenomena taking place when liquid Si-rich Si-Ti alloys are in contact with glassy carbon (GC) were investigated for the first time by wetting tests performed by both the sessile and pendant drop methods at T = 1450°C. Specifically, two different Si-rich Si-Ti alloys were selected, and the obtained results in terms of contact angle values, spreading kinetics, reactivity, and developed interface microstructures were compared with experimental observations previously obtained for the liquid Si-rich Si-Ti eutectics processed under the same operating conditions. The increase of the Si content did not affected the final contact angle values. Contrarily, the final developed microstructure at the interface as well as the spreading kinetics were observed as weakly dependent on the composition. From the practical point of view, Si-Ti alloy compositions with a Si-content falling in the simple eutectic region of the phase diagram might be potentially used as infiltrant materials of C- and SiC-based composites.

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Constituent Compatibility and Microstructural Stability

Cited by 10 publications

References 88 publications

Interfacial Phenomena between Liquid Si-rich Si-Zr Alloys and Glassy Carbon

Interfacial Phenomena between Liquid Si-rich Si-Zr Alloys and Glassy Carbon

Interfacial Phenomena between Liquid Si-Rich Si-Zr Alloys and Glassy Carbon

Interfaces Design in Lightweight SiC/TiSi2 Composites Fabricated by Reactive Infiltration Process: Interaction Phenomena between Liquid Si-rich Si-Ti Alloys and Glassy Carbon

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