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Effect of temperature on the healing capacity and mechanical properties of Ti2AlC MAX phase ceramicsSuh, Minji (author), Lee, Dong Heon (author), Sloof, W.G. (author), Lee, Kee Sung (author)In this study, the self-healing capacity of Titanium Aluminum Carbide (Ti<sub>2</sub>AlC, MAX phase) was investigated. Bulk coin samples were fabricated to evaluate the self-healing capacity at different temperatures (1000, 1200, and 1400°C). The extensive self-healing capacity of Ti<sub>2</sub>AlC was confirmed on larger quasiplastic damage ...journal article 2024
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Ding, Z. (author), Brouwer, J.C. (author), Kwakernaak, C. (author), Hermans, M.J.M. (author), Popovich, V. (author), Quadakkers, Willem J. (author), Sloof, W.G. (author)Mo(Al<sub>x</sub>Si<sub>1-x</sub>)<sub>2</sub> alloy with x in the range of 0.35–0.65 were prepared by a one-step spark plasma sintering. To study the exclusive formation of an α-Al<sub>2</sub>O<sub>3</sub> scale, oxidation experiments were conducted in low and high oxygen partial pressure ambient at 1373 K; viz.: 10<sup>−14</sup> and 0.21...journal article 2023
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Cernuschi, Federico (author), Kulczyk-Malecka, Justyna (author), Zhang, Xun (author), Nozahic, Franck (author), Estournès, Claude (author), Sloof, W.G. (author)The thermal diffusivity and conductivity of dense and porous binary composites having an insulating and conducting phase were studied across its entire composition range. Experimental evaluation has been performed with MoSi<sub>2</sub> particles embedded into yttria partially stabilized zirconia (YPSZ) as prepared by spark plasma sintering ...journal article 2023
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Ding, Z. (author), Brouwer, J.C. (author), Zhu, Jia-Ning (author), Popovich, V. (author), Hermans, M.J.M. (author), Sloof, W.G. (author)Boron containing MoSi<sub>2</sub> is a promising material for applications at high temperature, but the oxidation mechanism is still unclear. In this work, the high temperature (1100 °C) oxidation of B doped MoSi<sub>2</sub> in synthetic air has been investigated. A (boro)silicate layer is formed on the surface of the alloy, which features a...journal article 2023
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Aghaeian, S. (author), Norouzi, F. (author), Sloof, W.G. (author), Mol, J.M.C. (author), Bottger, A.J. (author)The parabolic growth rate constant (k<sub>p</sub>) of high-temperature oxidation of steels is predicted via a data analytics approach. Four machine learning models including Artificial Neural Networks, Random Forest, k-Nearest Neighbors, and Support Vector Regression are trained to establish the relations between the input features ...journal article 2023
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Aghaeian, S. (author), Brouwer, J.C. (author), Sloof, W.G. (author), Mol, J.M.C. (author), Bottger, A.J. (author)Since the oxidation reactions in the process of steel production occur in harsh conditions (i.e., high temperatures and gas atmospheres), it is practically impossible to observe in situ the compositional changes in the steel and the formed oxide scale. Hence, a coupled thermodynamic-kinetic numerical model is developed that predicts the...journal article 2023
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Sung Lee, Kee (author), Ahn, Hyeonji (author), Won Lee, Gye (author), Sloof, W.G. (author)Although the crack-healing capacity of Ti<sub>2</sub>AlC ceramics has been sufficiently studied, the ability of Ti<sub>2</sub>AlC to self-heal large-scale damage, such as foreign object damage (FOD), remains unknown. This paper investigates the self-healing ability of Ti<sub>2</sub>AlC ceramics with large-scale damage (∼1000 μm in diameter)....journal article 2023
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Ding, Z. (author), Brouwer, J.C. (author), Kwakernaak, C. (author), Zhu, Jia-Ning (author), Popovich, V. (author), Hermans, M.J.M. (author), Sloof, W.G. (author)To prevent premature triggering of the healing reaction in Mo-Si containing self-healing thermal barrier coating system, an oxygen impenetrable shell (α-Al<sub>2</sub>O<sub>3</sub>) around the sacrificial healing particles (MoSi<sub>2</sub>) is desired. Here an encapsulation method is presented through selective oxidation of Al in Mo(Al<sub>x...journal article 2023
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You, Y. (author), Kim, Jungki (author), Kwakernaak, C. (author), Brouwer, J.C. (author), Westerwaal, Ruud (author), Sloof, W.G. (author)The surface oxidation and wettability of Mn and Si-alloyed steel after annealing at different conditions are studied with scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and a so-called de-wetting method. After exposure at 950 °C for 1 hour in an Ar + 5 vol pct H<sub>2</sub> gas atmosphere with dew points (DP)...journal article 2022
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Ronda-Lloret, M. (author), Slot, T. K. (author), van Leest, N. P. (author), de Bruin, B. (author), Sloof, W.G. (author), Batyrev, E. (author), Sepúlveda-Escribano, A. (author), Ramos-Fernandez, E. V. (author), Rothenberg, G. (author), Shiju, N. R. (author)MXenes are a new family of 2D carbides or nitrides that have attracted attention due to their layered structure, tunable surface groups and high electrical conductivity. Here, we report for the first time that the Ti<sub>2</sub>CT<sub>x</sub> MXene catalyses the selective oxidative dehydrogenation of n-butane to butenes and 1,3-butadiene....journal article 2022
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Aghaeian, S. (author), Sloof, W.G. (author), Mol, J.M.C. (author), Bottger, A.J. (author)High-temperature oxidation of steels can be relatively fast when exposed to air. Consequently, elucidating the effect of different parameters on the oxidation mechanism and kinetics is challenging. In this study, short-time oxidation was investigated to determine the oxidation mechanism, the affecting parameters, and the linear-to-parabolic...journal article 2022
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Lee, Gye Won (author), Kim, Tae Woo (author), Sloof, W.G. (author), Lee, Kee Sung (author)Repetitive heating and cooling cycles inevitably cause crack damage of hot gas components of gas turbine engines, such as blades and vanes. In this study the self-healing capacity is investigated of mullite + ytterbium monosilicate (Yb<sub>2</sub>SiO<sub>5</sub>) as EBC material with Ti<sub>2</sub>AlC MAX phase particles embedded as a crack...journal article 2021
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Fu, Y. (author), Kwakernaak, C. (author), Sloof, W.G. (author), Tichelaar, F.D. (author), Brück, E.H. (author), van der Zwaag, S. (author), van Dijk, N.H. (author)Autonomous healing of creep-induced grain boundary cavities by Au-rich and W-rich precipitates was studied in a Fe-3Au-4W (wt pct) alloy at a fixed temperature of 823 K (550 °C) with different applied stresses. The ternary alloy, with two supersaturated healing solutes, serves as a model system to study the interplay between two separate...journal article 2020
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Fu, Y. (author), Kwakernaak, C. (author), Brouwer, J.C. (author), Sloof, W.G. (author), Brück, E.H. (author), van der Zwaag, S. (author), van Dijk, N.H. (author)Abstract: The precipitation of supersaturated solutes at free surfaces in ternary Fe–3Au–4W and binary Fe–3Au and Fe–4W alloys (composition in weight percentage) for different ageing times was investigated at a temperature of 700 °C. The time evolution of the surface precipitation is compared among the three alloys to investigate the...journal article 2020
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Zhao, M. (author), Brouwer, J.C. (author), Sloof, W.G. (author), Bottger, A.J. (author)Ternary alloys have been developed for a wide range of applications and surface segregation of ternary alloys has a decisive impact on their performance. Different from binary alloys, in which surface energy is usually the dominant factor, the interaction between solute elements has a noticeable effect on the surface segregation behavior of...journal article 2020
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Zhao, M. (author), Brouwer, J.C. (author), Sloof, W.G. (author), Bottger, A.J. (author)Pd–Cu alloys have been investigated as promising candidates for hydrogen separation membranes. Surface segregation influences the long-term performance of these membranes since their catalytic effect is mainly controlled by the surface composition. In the present research, surface segregation of Pd-40 at.% Cu alloy in vacuum and various gas...journal article 2020
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Ronda-Lloret, Maria (author), Marakatti, Vijaykumar S. (author), Sloof, W.G. (author), Delgado, Juan José (author), Sepúlveda-Escribano, Antonio (author), Ramos-Fernandez, Enrique V. (author), Rothenberg, Gadi (author), Shiju, N. Raveendran (author)MAX (M<sub>n+1</sub>AX<sub>n</sub>) phases are layered carbides or nitrides with a high thermal and mechanical bulk stability. Recently, it was shown that their surface structure can be modified to form a thin non-stoichiometric oxide layer, which can catalyze the oxidative dehydrogenation of butane. Here, the use of a Ti<sub>2</sub>AlC MAX...journal article 2020
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Osada, Toshio (author), Watabe, Aiko (author), Yamamoto, Joji (author), Brouwer, J.C. (author), Kwakernaak, C. (author), Ozaki, Shingo (author), van der Zwaag, S. (author), Sloof, W.G. (author)Bones of humans and animals combine two unique features, namely: they are brittle yet have a very high fracture toughness linked to the tortuosity of the crack path and they have the ability to repeatedly heal local fissures such that full recovery of overall mechanical properties is obtained even if the local bone structure is irreversibly...journal article 2020
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Fang, H. (author), Szymanski, N. (author), Versteylen, C.D. (author), Cloetens, P. (author), Kwakernaak, C. (author), Sloof, W.G. (author), Tichelaar, F.D. (author), Balachandran, S. (author), Herbig, M. (author), Brück, E.H. (author), van der Zwaag, S. (author), van Dijk, N.H. (author)When metals are mechanically loaded at elevated temperatures for extended periods of time, creep damage will occur in the form of cavities at grain boundaries. In the present experiments it is demonstrated that in binary iron-tungsten alloys creep damage can be self healed by selective precipitation of a W-rich phase inside these cavities. Using...journal article 2019
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Bei, G. (author), van der Zwaag, S. (author), Kota, Sanklap (author), Barsoum, Michel W. (author), Sloof, W.G. (author)The ultra-high temperature ablation of a polycrystalline, fully dense, predominantly single phase MoAlB ceramic discs under an oxyacetylene flame is examined. The linear ablation rate decreases from 1.3 μm/s during the first 30 s to - 0.7 μm/s after 60 s when the surface temperature reached about 2050 °C (with a flame temperature around 3000 °C)...journal article 2019