Article
Chemistry, Physical
Zydrunas Kavaliauskas, Romualdas Kezelis, Mindaugas Milieska, Liutauras Marcinauskas, Vitas Valincius, Mindaugas Aikas, Rolandas Uscila, Arunas Baltusnikas, Audrius Zunda
Summary: Yttria-stabilized zirconia (YSZ) coatings were deposited at different arc currents using atmospheric plasma spraying, and their properties were studied through various tests. The results showed that increasing arc current enhanced surface oxidation of YSZ coatings, while YSZ coatings deposited on rotating substrates exhibited better performance compared to those on immobile substrates.
SURFACES AND INTERFACES
(2021)
Article
Materials Science, Ceramics
Juan Luis Pantoja-Pertegal, Antonio Diaz-Parralejo, Antonio Macias-Garcia, J. Sanchez-Gonzalez, Eduardo M. Cuerda-Correa
Summary: This work focuses on the design, preparation, and characterization of YSZ coatings using the EPD technique. The study optimized the electrophoretic characteristics of YSZ suspensions, analyzed the correlation between experimental results and theoretical values, and achieved optimal coating results by thermal treatment of stainless steel substrates.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Nandang Mufti, Eprilia Trikusuma Sari, M. Tommy Hasan Abadi, Atika Sari Puspita Dewi, Markus Diantoro, Muhammad Safwan Aziz, Zulhadjri, Henry Setiyanto, Sunaryono, Poppy Puspitasari
Summary: This study investigated the use of solid electrolytes in photoelectrochemical technology to improve stability and efficiency of PEC cells. Activation of YSZ powder at different temperatures was found to be crucial for enhancing the performance of PEC devices.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
Vikram Hastak, Edward Jonas Gildersleeve, Srikanth Batna, Ashutosh Suresh Gandhi, Sanjay Sampath
Summary: Yttria-stabilized zirconia thermal barrier coatings were deposited by air plasma spraying using different purity feedstock powders and subjected to short-term low-temperature annealing. Significant structural changes and changes in thermal conductivity and elastic modulus were observed, with high-purity coatings showing larger changes compared to commercial purity coatings.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Nathaniel S. Olson, Frances I. Hurwitz, Haiquan Guo, Nathan J. Madden, Jamesa L. Stokes, Richard B. Rogers, Jessica A. Krogstad
Summary: Investigating doped metal oxide systems can lead to stabilization of porous structures at high temperatures, improving thermal stability. Increasing yttria content can enhance the thermal stability of aerogels by reducing densification, suppressing crystallite growth, and maintaining the mesoporous structure up to 1200 degrees Celsius.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Engineering, Civil
Olena Poliarus, Jerzy Morgiel, Wojciech Zorawski, Anna Goral, Malgorzata Pomorska, Krzysztof T. T. Wojciechowski, Oleksandr Cherniushok
Summary: Yttrium-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) are essential in turbine propulsion systems. The application of YSZ coatings deposited with atmospheric plasma spraying (APS) is limited due to their inability to withstand frequent thermomechanical loading. However, modifying the plasma spraying process by using nano-structured suspension instead of micrometric powders offers the highest improvement in properties and requires minimal changes in industry procedures.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
J. L. Vazquez-Arce, H. Tiznado, R. Kirchheim
Summary: Electrochemical cells fabricated on a silicon wafer demonstrate stable currents and open circuit voltage. The existence of virtual electrodes and unreacted material contributes to the generation of steady currents through reactions with the electrodes and internal reactions within the electrolyte. The calculated time to reach a steady state is inversely proportional to the incubation time, the second power of electric field strength, and the diffusion coefficient of oxygen vacancies.
Article
Materials Science, Multidisciplinary
Kun Huo, Fengze Dai, Wei Qian, Yunxia Ye, Jie Cai, Yinqun Hua, Xiaofeng Zhang
Summary: In this study, yttria-stabilized zirconia coatings were modified by laser micro glazing. Multiple laser irradiation was found to effectively eliminate pores in the coatings and improve their resistance to molten salt corrosion.
Article
Materials Science, Ceramics
Shen J. Dillon, Yu-Feng Shen, Gregory S. Rohrer
Summary: By investigating the variation of grain boundary energy, the characteristics of grain boundaries in 8% yttria-stabilized zirconia were identified, with a focus on the impact of [100] orientation and [100] twist boundaries. The study results indicate that by manipulating the microstructure to increase the relative areas of [100] twist boundaries, the oxygen ion conductivity of the material can be enhanced.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Multidisciplinary Sciences
Pushpak Banerjee, Avinava Roy, Soumyadeep Sen, Arkajit Ghosh, Gourab Saha, Asiful H. Seikh, Ibrahim A. Alnaser, Manojit Ghosh
Summary: The research aimed to accurately determine the relationship between the endurance of thermal barrier coatings (TBCs) and tribological investigations. Various methods were utilized to estimate the maximum durability of TBCs and found the optimized Yttrium doping concentration to be 3.5 wt %. The results were reliable and accurate, suggesting future research directions.
Article
Green & Sustainable Science & Technology
Sofia Saffirio, Sergii Pylypko, Sabina Fiorot, Ilaria Schiavi, Silvia Fiore, Massimo Santarelli, Domenico Ferrero, Federico Smeacetto, Sonia Fiorilli
Summary: In this study, an optimized recycling process was developed to recover YSZ from EoL SOC components. The multi-step procedure involved milling, hydrothermal treatment, and acid-assisted leaching, which resulted in YSZ powders with defined specifications. The hydrothermal treatment step played a crucial role in promoting the disaggregation of sintered powders and increasing the specific surface area. Acid-assisted leaching allowed for the full extraction of nickel while retaining the crystallinity of YSZ.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2022)
Article
Crystallography
Daini Wang, Wenxia Wu, Xiaojun Tan, Bernard A. Goodman, Shoulei Xu, Wen Deng
Summary: This study reports the preparation and optical properties of Yb/Pr co-doped YSZ single crystals with different Yb2O3 concentrations, showing potential use for laser and fluorescence output. Results revealed a cubic phase structure, high transmission, and upconversion emission under laser excitation, highlighting the crystals' promising characteristics.
Article
Materials Science, Ceramics
Lukas Theis, Frank Kern
Summary: Partially stabilized zirconia ceramics with different gadolinia content were prepared by co-milling, spray granulation, axial pressing, and pressureless sintering. The redistribution of stabilizers at high sintering temperatures was observed by XRD. Substituting gadolinia for yttria reduced the stabilizer content in the tetragonal phase and increased the tetragonality, transformability, and toughness of the materials, while decreasing the hardness. The cubic content increased with increasing gadolinia content, as predicted by thermodynamic considerations.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Lanxin Zou, Minghao Gao, Na Xu, Jia Zhang, Xinchun Chang
Summary: With the development of industry, the need for thermal barrier coatings (TBCs) with superior resistance to CMAS corrosion has become increasingly important. In this study, different coatings were prepared and their response to CMAS exposure was investigated. The results showed that doping Gd/Yb/Y elements into ZrO2 can improve the performance of TBCs.
Article
Materials Science, Ceramics
Marziyeh Danesh, Damien Mauran, Richard Berry, Marek Pawlik, Savvas G. Hatzikiriakos
Summary: In this study, cellulose nano crystals (CNC) were used as a dispersant in water-based suspensions of zirconia to investigate their stabilization in ceramic processing. The optimal pH value and minimum CNC concentration for producing stable highly concentrated suspensions were determined. The adsorption of CNC nanofibers around the zirconia particles was observed by scanning electron microscopy (SEM), which contributed to the achieved stability. The suspensions with the lowest viscosity and highest stability were obtained with 30 wt% zirconia particles at pH 4 and 1 wt% CNC.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Coatings & Films
P. Khamsepour, C. Moreau, A. Dolatabadi
Summary: Cold spray is promising in the aerospace industry for repairing damaged metallic components, but its drawback is the high porosity of sprayed samples. Utilizing high-velocity air fuel (HVAF) technology can increase sample density and particle bonding, but a proper finite-element simulation is needed to understand the effect of particle deformation.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2022)
Article
Thermodynamics
Mohammad Mahdi Nasiri, Ali Dolatabadi, Christian Moreau
Summary: The flattening process of a droplet impacting a solid surface is crucial in various industrial applications. In this study, a numerical model is developed to investigate the formation of fragmented splats during droplet flattening and solidification in plasma spraying conditions. The numerical results show that gas desorption from the surface produces a barrier layer, affecting the heat transfer and spreading of the droplet.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Materials Science, Ceramics
Hediyeh Khatibnezhad, Fabian Ambriz-Vargas, Fadhel Ben Ettouil, Christian Moreau
Summary: In this study, TiO2 coatings with different phase contents, oxygen contents, and roughnesses were produced using suspension plasma spraying (SPS) with varying hydrogen flow rates. The presence of anatase phase was found to enhance the photocatalytic activity of the coatings.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Coatings & Films
Payank Patel, Sima A. Alidokht, Navid Sharifi, Amit Roy, Kelly Harrington, Pantcho Stoyanov, Richard R. Chromik, Christian Moreau
Summary: High entropy alloys (HEAs), characterized by containing five or more principal elements, are considered as potential candidates for high-temperature applications due to their superior mechanical and thermal properties. In this study, the microstructure and wear behavior of CrMnFeCoNi HEA coatings were evaluated, revealing equivalent behavior of as sprayed and annealed coatings on polished surfaces and higher wear rates on rough surfaces.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
S. Mohammadkhani, A. Bily, B. Davis, A. Dolatabadi, C. Moreau, L. Roue, D. Guay
Summary: TiB2-coated graphite substrates have the potential to be wettable cathodes for aluminum electrolysis. The properties of the coatings can be improved, and a double-layered coating shows better performance in contact with molten aluminum.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
Vahid Jalilvand, Saeed Mohammadkhani, Fadhel Ben Ettouil, Lionel Roue, Ali Dolatabadi, Daniel Guay, Christian Moreau
Summary: The high-temperature behavior of Cu-Ni-Fe-coated materials as inert anodes for zero-carbon Al production is evaluated. Co0.5Ni0.5O top coat is deposited on CrMnFeCoNi high entropy alloy (HEA) and Ni-20Cr bond coats with Cu-rich and Ni-rich CuNiFe as the substrate materials. The effect of the bond coat layers on the oxidation resistance of coated samples is investigated, revealing the formation of a dense thin layer of Cr2O3 on both bond coats to inhibit oxygen diffusion. No diffusion of elements is observed from NiCr to (Co,Ni)O, while Mn atoms diffuse from HEA into the top coat layer during oxidation process.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
Vahid Jalilvand, Saeed Mohammadkhani, Fadhel Ben Ettouil, Lionel Roue, Daniel Guay, Ali Dolatabadi, Christian Moreau
Summary: SPS-sprayed (Co,Ni)O coating was investigated as a potential material for inert anode applications in Al production. In-flight particles and splats formed on heated metal substrates were studied to understand the melting and mixing of NiO and CoO powders during spraying. SEM, EDS, and x-ray diffraction analyses helped clarify the formation of different crystalline phases in the coatings. The intermixing of NiO and CoO primarily occurred on the substrate surface, while the metallic nickel phase could also form in the coatings.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
P. Khamsepour, C. Moreau, A. Dolatabadi
Summary: In solid-state deposition techniques, the initial conditions of particles and substrates are crucial for particle deformation and adhesion strength to the substrate. The presence of an oxide layer increases the required critical velocity for particle adhesion, while particle temperature has no significant effect on adhesion between the particle and substrate.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
Farzam Arhami, Fadhel Ben Ettouil, Christian Moreau
Summary: This research addresses the challenges of spraying Yb2Si2O7 environmental barrier coatings, including high amorphous phase formation tendency, desirable microstructure and phase composition, and silicon evaporation. By depositing high crystalline Yb2Si2O7 using atmospheric plasma spray without auxiliary heat-treating, vacuum chamber, or subsequent furnace heat treatment, cost, time, and energy savings are achieved. The spraying process with controlled silicon evaporation and an optimum fraction of the Yb2SiO5 secondary phase leads to exceptional crystallinity levels and a desirable microstructure. Decreasing the plasma power from 90 to 53 kW reduces silicon mass loss but increases porosity fraction.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
J. Oberste-Berghaus, M. Aghasibeig, A. Burgess, P. Khamsepour, C. Moreau, A. Dolatabadi
Summary: Ti-6Al-4V is a widely used alloy in the aerospace industry due to its exceptional properties. Efforts are being made to develop additive manufacturing technologies for this alloy. Thermal and cold spray methods are also being explored to create near-net-shaped parts. By lowering the flame temperature and using miniaturized HVOF systems, it is possible to improve the deposition quality and spatial resolution of the buildup.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
P. Khamsepour, J. Oberste-Berghaus, M. Aghasibeig, F. Ben Ettouil, A. Dolatabadi, C. Moreau
Summary: High-velocity air-fuel combustion process can deposit metallic particles with minimum oxidation and decomposition. The study focused on using an inner-diameter HVAF gun to produce dense Ti-6Al-4V coatings. Increasing air and fuel pressure and nozzle length improved particle velocity and resulted in improved density and hardness of the coatings, while increasing spraying distance had a negative effect.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
G. Y. Koga, A. R. C. Nascimento, F. B. Ettouil, L. C. M. Rodrigues, G. Zepon, C. Bolfarini, C. S. Kiminami, W. J. Botta, R. Schulz, A. Costa e Silva, C. Moreau, F. G. Coury
Summary: Thermally sprayed Cr40Co40Ni20 coatings were produced by HVOF and HVAF, forming chromia and spinel compounds upon oxidation at high temperatures. Chromia formed at the inner layer and spinel at the outer layer. HVAF coatings showed less oxidation compared to HVOF coatings. However, the formation of spinel and oxide in the coatings led to regions susceptible to corrosion in chloride-rich electrolyte.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
Sina Mirzai Tavana, Mehdi Hojjati, Andre C. Liberati, Christian Moreau
Summary: This paper investigates the fabrication and performance evaluation of a solid particle erosion resistant layer on polymer-based composites. Coating materials including tungsten carbide-cobalt, martensitic chromium stainless steel, and alumina-titania were deposited using air plasma spray (APS) to enhance erosion resistance. A stainless steel mesh was incorporated during composite fabrication to protect the composite fibers during grit blasting and thermal spraying, improving the adhesion between coatings and substrate. Tests were conducted to assess mechanical and tribological properties. Results showed that coating bonding strength significantly improved with identified processing parameters. Coating materials with brittle behavior exhibited higher erosion resistance on stiff substrates, while ductile coatings were more suitable for less stiff substrates like carbon fiber reinforced composites.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
Amit Roy, Venkata Naga Vamsi Munagala, Payank Patel, Navid Sharifi, Sima A. Alidokht, Mary Makowiec, Richard R. Chromik, Christian Moreau, Pantcho Stoyanov
Summary: Tantalum oxide-based coatings have been developed by suspension plasma spraying and their tribological behavior at high temperatures has been evaluated. The coatings exhibit uniform and dense nanostructure with no phase transformation. The friction coefficient of the coatings decreases slightly from 0.9 at 25 degrees C to 0.8 at 300 degrees C, while the wear rate decreases by more than 50%. The decrease in friction and wear at elevated temperatures is attributed to the formation of a smooth continuous layer and a stable transfer film.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Venkata Naga Vamsi Munagala, Sima A. Alidokht, Navid Sharifi, Mary E. Makowiec, Pantcho Stoyanov, Christian Moreau, Richard R. Chromik
Summary: CoMoCrSi alloys with intermetallic Laves phases exhibit high hardness and excellent wear resistance. Diamalloy3001 coatings deposited using HVOF spraying process showed low wear rates at room temperature due to the formation of tribolayers composed of Co, Cr, and Mo oxides. However, at elevated temperatures, detachment of tribolayers and formation of cavities increased the wear rates.
TRIBOLOGY INTERNATIONAL
(2023)