Article
Materials Science, Coatings & Films
Yueh-Cheng Yu, David L. Poerschke
Summary: This study focused on the design of thermal and environmental barrier coatings for Nb-based alloys for high-temperature operation, proposing different multilayer T/EBCs and using mechanics models to analyze thermal stresses and crack formation. Phase equilibria calculations indicated the stability of all combinations at expected use temperatures.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Rebekah I. Webster, Elizabeth J. Opila
Summary: This study investigates the interaction of molten silicates with engine components as temperature increases. Experimental data were compared to calculated data, and the FactSage model most accurately described the melts investigated in this study.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Dianying Chen, Xavier Maeder, Beno Widrig, Jurgen Ramm, Daniel De Wet
Summary: In this study, EBCs consisting of a dense Yb2Si2O7 top coat and a columnar structure silicon bond coat were deposited using a hybrid chemical-physical vapor deposition process to protect SiC based CMCs from steam attack. The coating was characterized by XRD and SEM, and it was found that the as-deposited Yb-Si-O coating transformed to crystalline Yb2Si2O7 and Yb2SiO5 phases. The durability of the EBC in steam cycling test was excellent.
Review
Materials Science, Coatings & Films
V. Edward J. J. Gildersleeve, Robert Vassen
Summary: Thermal spray coatings are unique material systems that have driven the development of modern technologies. Their distinctive thermal and mechanical properties have maintained industrial interest. However, the adoption of thermal spray technology in new applications can be challenging, potentially increasing risk. Nevertheless, industries have benefited from implementing thermal spray coatings to improve manufacturing cost and component performance.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Han Zhang, Jie Lu, Lirong Luo, Xiaofeng Zhao, Fangwei Guo, Ping Xiao
Summary: The study found that the chemical compatibility of rare earth apatite with YSZ is influenced by the ionic radius of the rare earth element, with larger ionic radius enhancing the compatibility between the two materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Lin Chen, Jiankun Wang, Luyang Zhang, Baihui Li, Keren Luo, Jiang Tian, Hao Xu, Jing Feng
Summary: This perspective outlines the research directions and characteristics of ferroelastic rare-earth tantalates (RETaO4) as multifunctional thermal/environmental barrier coatings (T/EBCs) with high working temperatures. The perspective summarizes the research progress on tantalate coatings synthesized via different methods and highlights the importance of understanding failure mechanisms and establishing synthesis-structure-property relationships for future studies.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Lin Dong, Mei-Jun Liu, Xiao-Feng Zhang, Guan-Jun Yang, Ke-Song Zhou
Summary: By infiltrating aluminum, a dense environmental barrier coating was designed to prevent rapid permeation of oxidants and improve corrosion resistance.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Meiqi Dai, Chucheng Lin, Wei Zheng, Jimei Zhang, Caifen Jiang, Xuemei Song, Yi Zeng
Summary: Yb2O3-Y2O3 co-doped Sr(Zr0.9Yb0.05Y0.05)O-2.95 coatings exhibit low thermal conductivity due to their microstructural features, such as small grain size, solid solution, and special grain boundary structures.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Coatings & Films
Kaiyue Lu, Shujuan Dong, Tengfei Deng, Yan Huang, Gui Li, Qing Hu, Jianing Jiang, Longhui Deng, Xueqiang Cao
Summary: The effect of post-annealing in air or argon atmosphere on the microstructure, thermal shock, and steam corrosion of LaMgAl11O19/Yb2Si2O7 (LMA/YbDS) thermal/environmental barrier coatings (T/EBCs) on SiCf/SiC composites was investigated. Heat treatment in both atmospheres eliminated the amorphous in the coatings and reduced thermal mismatch stress, resulting in improved thermal cycling lifetime. Additionally, the argon-annealed coatings exhibited greater resistance against steam corrosion due to the presence of unbroadened vertical cracks that limited reactant access.
SURFACE & COATINGS TECHNOLOGY
(2023)
Review
Materials Science, Ceramics
Zhenya Zhang, Youngjin Park, Zhaolu Xue, Shihong Zhang, Eungsun Byon, Bon-Heun Koo
Summary: This paper introduces the research status of bond coats in environmental barrier coatings (EBCs), including the materials and deposition methods. The existing bond coats have limitations in high-temperature extreme environments, such as oxidation of Si bond coat and selective evaporation of SiO2 in mullite bond coat. HfSiO4 is proposed as a potential candidate for the next-generation bond coat in EBCs, and it is emphasized that choosing reasonable deposition methods can improve the performance of bond coats in EBCs.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yang Wu, Wenjia Song, Donald B. Dingwell, Hongbo Guo
Summary: The influence of silicate ash on gas turbines is significant, with the development of the NdYbZr2O7 coating substrate addressing these challenges effectively.
Article
Materials Science, Ceramics
Meiqi Dai, Xuemei Song, Chucheng Lin, Ziwei Liu, Wei Zheng, Yi Zeng
Summary: This study investigates the changes in microstructure of YSZ coatings and Al2O3-YSZ coatings during thermal cycling, and finds that these changes are closely related to the thermal cycle life of the coatings.
JOURNAL OF ADVANCED CERAMICS
(2022)
Article
Chemistry, Physical
Sehreish Abrar, Zhuang Ma, Ling Liu, Faisal Nazeer, Abdul Malik
Summary: A new multicomponent rare earth pyrosilicate (5RE0.2)2Si2O7 has been developed for thermal/environmental barrier coating. It exhibits low thermal conductivity, good match of coefficient of thermal expansion with SiC-based ceramics matrix composites, and excellent resistance against CMAS.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Coatings & Films
Dianying Chen
Summary: In this study, Yb2Si2O7 coatings were deposited on Si-based ceramic matrix composites using the suspension HVOF process. The effect of standoff distance on coating microstructure was evaluated, and it was found that shorter standoff distances resulted in denser amorphous coatings transforming to crystalline phases after heat treatment. Furthermore, the oxidation behavior of the SHVOF EBCs was compared with air plasma sprayed EBCs and showed a slower oxide growth rate.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
V. Edward J. Gildersleeve, Emine Bakan, Robert Vassen
Summary: As gas turbine firing temperatures continue to increase, the transition of materials from Ni-based superalloy components to CMCs is in progress. This study demonstrates the feasibility of using MultiLayered T-EBCs coatings to address the design challenges for these CMCs.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Valerie L. Wiesner, David Scales, Nathan S. Johnson, Bryan J. Harder, Anita Garg, Narottam P. Bansal
CERAMICS INTERNATIONAL
(2020)
Article
Materials Science, Multidisciplinary
Valerie L. Wiesner, Bryan J. Harder, Anita Garg, Narottam P. Bansal
JOURNAL OF MATERIALS RESEARCH
(2020)
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
Materials Science, Ceramics
Jamesa L. Stokes, Narottam P. Bansal, Valerie L. Wiesner
Summary: The thermochemical degradation of hafnium silicate (HfSiO4) was investigated with a molten calcium-magnesium-aluminosilicate (CMAS) glass. The formation of Ca2HfSi4O12 cyclosilicate phase at lower temperatures and rapid infiltration of CMAS into HfSiO4 at higher temperatures were observed.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Applied
Rebecca C. Walker, Jamesa L. Stokes, Frances Hurwitz, Haiquan Guo, James K. Ferri
Summary: Aerogels are used as thermal insulators in spaceflight applications, but their thermal stability needs to be optimized. By adding the surfactant CTAB, this study increased the surface area and pore volume of YSZ aerogels, enhancing their thermal stability.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Jamesa L. Stokes, Bryan J. Harder, Valerie L. Wiesner, Douglas E. Wolfe
Summary: Solid solutions within the Yb2Si2O7-Gd2Si2O7 system were synthesized and characterized. The addition of Gd2Si2O7 resulted in multiple phase transformations and stabilized the crystal structures. The thermal expansion coefficients of the solid solutions were mostly unaffected by the addition of Gd2Si2O7.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Materials Science, Ceramics
Gustavo Costa, Bryan J. Harder, Narottam P. Bansal, Jamesa L. Stokes, Kristina Lilova, Tamilarasan Subramani, Sergey Ushakov, Kevin J. Meisner, Alexandra Navrotsky
Summary: This paper summarizes the previous and current studies on using high-temperature calorimetry to investigate the energetics of reactions between ceramic coating materials and silicate melts in the CMAS system. The results suggest that the reactivity between the coating materials and the melt is influenced by the acid-base character and thermodynamic stability of the coating material. They also indicate that ceramic coating materials with less exothermic enthalpies of solution and mixing are less susceptible to CMAS melt corrosion when in contact with an acidic, polymerized melt rich in SiO2.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Geochemistry & Geophysics
Brandon G. Radoman-Shaw, Ralph P. Harvey, Gustavo Costa, Nathan S. Jacobson, Amir Avishai, Leah M. Nakley, Daniel Vento
Summary: Climate models for Venus heavily rely on theoretical modeling and laboratory experimentation due to the extreme surface conditions and limited data. A recent study exposed volcanic glasses and basaltic minerals to simulate Venus surface conditions and observed significant reactivity and the formation of secondary minerals. These findings provide important insights for understanding Venus' surface mineralogies and their implications for future missions.
METEORITICS & PLANETARY SCIENCE
(2022)
Article
Materials Science, Ceramics
Benjamin Kowalski, Jamesa Stokes, Patrick. E. E. Albert, Pete. E. E. Lauer, Douglas. E. E. Wolfe
Summary: This study investigates the effect of grain size, areal density, and aspect ratio on the infiltration of CMAS into yttria stabilized zirconia. The infiltration depths ranged from 6 up to 85 μm depending on the test conditions.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Applied
Rebecca C. Walker, Kimberly E. Penzer, Jamesa L. Stokes, Frances I. Hurwitz, Haiquan Guo, James K. Ferri
Summary: This work investigates the effects of anionic surfactant sodium dodecyl sulfate (SDS) and nonionic surfactant Pluronic (R) P-123 as templates in yttria-stabilized zirconia (YSZ) aerogels. The addition of surfactants increased the surface area and pore volume of as-dried aerogels and suppressed crystallite growth at high temperatures. However, the impact of surfactant templates on the surface area and pore volume of heat-treated aerogels was negligible, potentially due to low concentrations of surfactant and the removal of the surfactant following high-temperature exposure.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Jamesa L. Stokes, Cameron J. Bodenschatz, Bryan J. Harder, Valerie L. Wiesner, Wissam A. Saidi, Douglas E. Wolfe
Summary: Mixtures of Y2Si2O7 and Gd2Si2O7 were synthesized and characterized to determine their coefficients of thermal expansion (CTE) via in situ x-ray diffraction. All solid solutions within the system showed the orthorhombic δ-RE2Si2O7 (Pna21) structure. Thermal expansion measurements correlated well with reported values and all synthesized solid solutions exhibited intermediate CTEs. Generally, as the content of Gd2Si2O7 increased, there was a slight decrease in CTE, with Gd2Si2O7 having the lowest CTEs and Y2Si2O7 the highest CTEs. The small decrease in CTE was attributed to the stronger Gd-O bonds over Y-O bonds.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Materials Science, Ceramics
Michael J. Presby, Jamesa L. Stokes, Bryan J. Harder
Summary: Ceramic matrix composites (CMCs) and environmental barrier coatings (EBCs) are crucial for improving the efficiency of gas turbine engines, but their susceptibility to various damage modes limits their performance. The understanding of solid particle erosion (SPE) behavior of CMCs and EBCs is currently lacking. This paper reviews the status of SPE research for CMCs and EBCs and suggests future research directions.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Zilong Xiong, Wenzhuo Xue, Mujun Li, Feihu Tan, Yupeng Chen, Hongyu Yu
Summary: In this study, CBS glass/Al2O3 composites were developed for LTCC applications based on a CaO-B2O3-SiO2 (CBS) glass system with a high boron content. The study revealed that the softening of glass and interfacial reaction between the glass and Al2O3 were the two most important factors affecting LTCC's densification process. Real-time shrinkage rate of LTCC during sintering was successfully simulated, and it was proven that the formation of the CaAl2(BO3)O phase played a significant role in reducing glass viscosity and promoting dense structure formation. The resulting LTCC composite exhibited excellent performance for high-frequency applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Saurabh Kumar Sharma, Vinita Grover, Rakesh Shukla, Abid Hussain, Ambuj Mishra, Pawan Kumar Kulriya
Summary: In this study, the disordering caused by swift heavy ion irradiation in two different compositions of pyrochlore structures was investigated. X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy were used to analyze the samples before and after irradiation. It was found that both compositions underwent amorphization due to irradiation, with a slower rate observed in Nd1.8Zr2.2O7.1. The irradiation-induced modified track region in Nd1.8Zr2.2O7.1 consisted of defect-rich pyrochlore structure, anion-deficient fluorite structure, and amorphous domains.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiabei He, Mengshan Song, Ming Yang, Miaomiao Zhu
Summary: This study investigates the influence of ion irradiation on high-entropy ceramics and finds that irradiation-induced lattice rearrangement can improve the radiation resistance of these ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yajie Yu, Shi He, Zhengang Zhang, Haihua Chen, Peipeng Jin, Binnian Zhong, Linhui Zhang, Liping Wang, Cheng Lu
Summary: Silicide ceramics, including tantalum disilicide (TaSi2), are known for their exceptional physical properties but are limited in practical applications due to their inherent brittleness at room temperature. In this study, we successfully improved the mechanical properties of TaSi2 ceramics and increased their electrical conductivity by modifying the preparation methods and sintering conditions. These findings provide valuable insights for future applications of TaSi2 and the design of advanced ceramic materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jian Li, Jia Liu, Yongcui Zhang, Wei Sun, Yang Wang, Haitao Wu, Ling Li, Chuanbing Cheng, Yingying Wang, Ke Tan, Futian Liu
Summary: Microstructure design plays a crucial role in regulating the microwave dielectric properties of materials, however, the understanding of frequency temperature stability and related micromechanism remains limited. In this study, a combination of first-principles calculations and experimental observation was used to investigate the correlation among sintering behavior, crystal structure, bonding nature, and microwave dielectric properties of LnPO(4) (Ln = Eu, Pr) ceramics. The research findings systematically clarify the optimized effect and micromechanism of lanthanides on the dielectric properties of monazite ceramics, providing insights into the design and enhancement of microwave dielectric materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Wenqian Pan, Xizhen Xia, Wei Zhou, Yang Li
Summary: The study investigates the frictional and wear behaviors of carbon fiber-reinforced SiC ceramic matrix composites with different fiber orientations mating with ceramic balls. The results show that fiber orientation significantly affects the friction and wear properties of the composites. Pads with randomly arranged fibers demonstrate better friction stability and lower wear volume, potentially suitable for bearing material applications. The research also explores the factors influencing the formation of continuous tribo-film and identifies abrasive wear and oxidation wear as the dominant wear mechanisms for the friction pairs.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sergey Nikolaevich Perevislov, Ilya Evgenievich Arlashkin, Valentina Leonidovna Stolyarova
Summary: This paper describes the synthesis and sintering of MAX phases in the Zr-Al-C system. Different mixtures of initial Zr/Al/C and Zr/Al/ZrC powders were used to synthesize Zr2AlC and Zr3AlC2 MAX phases. The highest content of Zr3AlC2 MAX phase was obtained using a component ratio of 1:1.5:2-51.1 vol.% of Zr/Al/ZrC powders.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Weijia Luo, Xubin Wang, Baiheng Bai, Jianli Qiao, Xingcong Chen, Yongzheng Wen, Jingbo Sun, Lingxia Li, Ji Zhou
Summary: This study successfully establishes the relationship between internal strain and dielectric loss by synthesizing and designing specific structure of tungsten bronze ceramics, and concludes that controlling internal strain can effectively reduce dielectric loss. This research is of great significance for the development of future all-ceramic non-Hermitian devices.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Santanu Mondal, Juan Diego Shiraishi Lombard, Sreenivasulu Gollapudi, Carolina Tallon, Jie-Fang Li, Dwight Viehland
Summary: Ultrafast high-temperature sintering (UHS) is an effective method for rapidly densifying ZrB2 powders. The final grain size increases with longer sintering duration. X-ray diffraction and energy-dispersive spectroscopy show crystalline phase and compositional uniformity in ZrB2 after UHS.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
JiaNan Wang, ZhiQiang Li, YongZheng Zhu, Yao Liang, Yan Cui, HuaLong Tao, Bo Song, Alexander Nikiforov, ZhiHua Zhang
Summary: First-principles calculations were performed to investigate the crystal structure, electronic structure, and ion diffusion of sulfur-doped Li2FeSiO4. The results showed that sulfur doping can improve the electronic conductivity and reduce the energy barrier for ion diffusion.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Xiaodi Dai, Serdar Aydin, Mert Yuecel Yardimci, Gunter Reekmans, Peter Adriaensens, Geert De Schutter
Summary: This study investigates the rheological behavior, solidification process, and nanostructure changes of sodium hydroxide-activated slag (NH-AAS) and sodium silicate-activated slag (SS-AAS) pastes over time. The results show that NH-AAS and SS-AAS release similar heat and reach a similar reaction degree at their initial setting times, but have different gel structures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yanliang Ji, Simon Becker, Zichen Lu, Alexander Mezhov, Regine von Klitzing, Schmidt Wolfram, Dietmar Stephan
Summary: This study reveals the significant influence of resting time on the rheological properties of cement suspensions, which is closely related to non-absorbed polycarboxylate superplasticizers (PCEs) size variation. Adsorbed PCE during resting tends to bridge particles instead of dispersing them, leading to an increased yield stress.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yifeng Huang, Xin Wang, Yinchang Ma, Xiang Lv, Jiagang Wu
Summary: This study investigates the effect of K/Na ratio on the phase structure, ferroelectric domains, and piezoelectric properties of potassium sodium niobate (KNN)-based ceramics. It reveals that high Na+ content leads to large ferroelectric domains, while high K+ content results in local polarity heterogeneity and distinct dielectric relaxational behavior. The balanced local polarity and stress heterogeneities contribute to improved piezoelectricity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zun Xia, Yedong Rong, Hao Li, Ye Dong, Hongbo Yu, Jie Xu, Xiuhui Wang, Jinlong Yang
Summary: This study presents the synthesis of hollow MgAl2O4 particles in situ within porous ceramics, resulting in volume expansion and the formation of a hierarchical pore structure, leading to a significant improvement in compressive strength.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Honglong Wang, Zhiguo Sun, Faming Xia, Chenguang Yang, Xiaoguang Wang, Jintang Li, Linxu Jiang
Summary: In this study, the micro-geometry morphology variation and microstructural transformation mechanism of muscovite crystals under electron beam irradiation were explored. The results revealed the instability of the muscovite lattice under irradiation, as well as the expansion and shrinkage of the lattice with increasing dose. The study also identified changes in chemical structure and other mechanisms involved. These findings are significant for the design of radiation-resistant silicate materials and the manufacturing of electronic components used in the aerospace industry.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)