Article
Materials Science, Ceramics
Daniel Tejero-Martin, Acacio Rincon Romero, Richard G. Wellman, Tanvir Hussain
Summary: Molten calcium magnesium alumina-silicates (CMAS) pose a challenge for rare earth silicates environmental barrier coatings (EBCs). The interaction between ytterbium disilicate (Yb2Si2O7) coatings and CMAS was studied, revealing that higher porosity levels facilitate CMAS infiltration and the formation of a fine porous network. Despite complete CMAS infiltration, no damage was observed, providing a promising direction for environmental barrier abradable coatings.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Seung-Hyeon Kim, Nobuo Nagashima, Yoshitaka Matsushita, Byung-Koog Jang
Summary: This study focused on the high-temperature behavior of Gd2Si2O7 interacting with CMAS melt, revealing that the thickness of the reaction layer increased parabolically with heat-treatment time, resulting in the formation of Ca2Gd8(SiO4)6O2 apatite.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(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, 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, Multidisciplinary
Kareem El Shafei, Nasrin Al Nasiri
Summary: The study found that CMAS dissolved in Yb and Lu-based coatings to form protective Ca-RE garnet phase, while in Er-based coating, unprotective apatite was formed. Yb and Lu-silicate EBCs offer higher resistance to CMAS attack, and the use of RE2O3 topcoat proves to be a beneficial strategy to limit CMAS corrosion.
Article
Materials Science, Multidisciplinary
Shujuan Dong, Kaiyue Lu, Yihui Wang, Jinyan Zeng, Jieyan Yuan, Jianing Jiang, Longhui Deng, Xueqiang Cao
Summary: The hot corrosion behavior of plasma-sprayed HfSiO4 coatings exposed to CMAS and steam was investigated. The coatings showed good resistance against steam corrosion and avoided significant volume expansion by the buffering effect of pores/microcracks. The coating degradation at high temperatures was associated with TGO volatilization, phase transformation, and thermomechanical incompatibility.
Article
Materials Science, Multidisciplinary
Dong Fan, Xin Zhong, Zhenzhong Zhang, Pingping Liu, Liping Huang, Yaran Niu, Lujie Wang, Qilian Li, Xuebin Zheng
Summary: In this study, the CMAS corrosion behavior of high-entropy monosilicate coatings and Y2SiO5 coating was investigated and compared. The results showed that the high-entropy coatings exhibited improved corrosion resistance, which could be attributed to the doped rare-earth elements enhancing the stability of crystal structure and facilitating the formation of garnet phase.
Article
Materials Science, Ceramics
Fan Dong, Zhong Xin, Wang Yawen, Zhang Zhenzhong, Niu Yaran, Li Qilian, Zhang Le, Zheng Xuebin
Summary: The corrosion resistance of X2-RE2SiO5 coatings was better than that of X1-Gd2SiO5 coating due to their phase compositions and stability of crystal structure. After corrosion by CMAS, X1-Gd2SiO5 coating dissolved in CMAS melt and formed apatite phase, while the X2-RE2SiO5 coatings not only formed apatite phase, but also formed garnet phase from reaction of the RE2O3 in the coatings with Al2O3 in CMAS.
JOURNAL OF INORGANIC MATERIALS
(2023)
Article
Materials Science, Ceramics
Eeshani P. Godbole, Nethmi Hewage, Anette von der Handt, David L. Poerschke
Summary: The durability of T/EBCs exposed to CMAS deposits depends on the nature of reactions between the coatings and deposits, which consume the melt and can block porosity. This study compares the efficiency of reaction products reported in the literature to those formed on four prospective T/EBC materials. The results show that adding aluminates to zirconate materials promotes the crystallization of garnet, cuspidine, and apatite, but reduces reaction efficiency compared to single phase zirconates.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
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.
Article
Materials Science, Multidisciplinary
Luchao Sun, Xiaomin Ren, Yixiu Luo, Xirui Lv, Jiemin Wang, Yoonsuk Oh, Jingyang Wang
Summary: This study designed a material with excellent CMAS corrosion resistance and revealed the synergistic effects of rare earth elements in improving the corrosion resistance. The results demonstrated the importance of both inert and active elements in maintaining phase stability and reducing corrosion activity.
Article
Materials Science, Ceramics
Xiaotong Guo, Yulei Zhang, Tao Li, Pengfei Zhang, Kang Shuai, Jie Li, Xiaohong Shi
Summary: A new high-entropy ceramic (5RE(0.2))(2)Si2O7 was proposed as a potential environmental barrier coating material for ceramics matrix composites. The (5RE(0.2))(2)Si2O7 showed good phase stability, low coefficient of thermal expansion and thermal conductivity, and exhibited better water vapor corrosion resistance.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Xin Zhong, Yawen Wang, Pingping Liu, Liping Huang, Yaran Niu, Qilian Li, Le Zhang, Xuebin Zheng
Summary: The corrosion behaviors and mechanisms of plasma-sprayed X1-Gd2SiO5 and X2-RE2SiO5 environmental barrier coatings against CMAS melts at 1400°C were investigated. The results showed that the RE2SiO5 coatings dissolved into CMAS melts and formed a continuous apatite phase layer at the interface. In addition, garnet phase was observed only in the X2-Er2SiO5 coating. The corrosion resistance of RE2SiO5 was affected by its microstructure and RE ionic radius.
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)
Review
Materials Science, Multidisciplinary
Andy Nieto, Richa Agrawal, Luis Bravo, Clara Hofmeister-Mock, Marc Pepi, Anindya Ghoshal
Summary: This review critically examines the current understanding of CMAS degradation mechanisms and mitigation approaches, emphasizing the importance of designing materials approaches to mitigate CMAS attack and presenting key future research areas for 'sandphobic' thermal and environmental barrier systems.
INTERNATIONAL MATERIALS REVIEWS
(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
Engineering, Environmental
Grant M. Schneeberger, Ryan Kozlowski, Douglas Wolfe, Jose L. Palacios
Summary: This study explores the potential of erosion resistant titanium aluminum nitride coatings (TiAlN) as ice protective coatings by reducing surface roughness and coating defects. The research demonstrates that TiAlN coatings can reduce ice adhesion strength, and smoother coatings show decreased dependency of ice adhesion strength on temperature. The results suggest that aircraft ice adhesion strength is highly mechanical and interacts with the surface morphology.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Michael P. Schmitt, Sergei P. Stepanoff, Amarendra K. Rai, Pete E. Lauer, Ryan W. Spangler, Douglas E. Wolfe
Summary: This study compares the behavior of GZO and GAP materials in relation to CMAS degradation. The results show that GAP dissolves slower than GZO while producing an equivalent or higher amount of pore blocking apatite. GAP also induces intrinsic crystallization of the CMAS into a gehlenite phase. Moreover, GAP exhibits a thinner reaction zone and less sensitivity to CMAS loading compared to GZO, suggesting its potential as a CMAS barrier material and inclusion into composite TBCs.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Douglas E. Wolfe, Patrick E. Albert, Caillin J. Ryan, Justin A. Reiss, Sergei P. Stepanoff, Petr A. Kolonin
Summary: By optimizing the FAST processing conditions, dense (Hf,Ta)C ceramics without the need for sintering aids can achieve high mechanical properties, primarily influenced by solid solution strengthening and the Hall-Petch effect.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(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, Multidisciplinary
Suad Alghamdi, Stephanie Bennett, Carol Crean, Joydip Ghosh, Harry Gibbard, Robert Moss, Justin Reiss, Douglas Wolfe, Paul Sellin
Summary: In this study, we investigated the performance of formamidinium lead bromide (FAPbBr(3)) perovskite X-ray detectors fabricated from polycrystalline material. We found that increasing the pressure and annealing have positive effects on the microstructure, density, stability, and charge transport performance of the devices.
APPLIED SCIENCES-BASEL
(2022)
Article
Physics, Applied
Md Abu Jafar Rasel, Sergei P. Stepanoff, Maxwell Wetherington, Aman Haque, Douglas E. Wolfe, Fan Ren, Stephen Pearton
Summary: This study investigates the thermal and mechanical responses of depletion mode GaN high electron mobility transistors exposed to gamma radiation. Lower doses of radiation improve electrical properties, but degradation initiates at about 10^6 rads. At the highest dose, there is a decrease in saturation current and transconductance, and a notable increase in leakage current. The temperature increases by 40% and mechanical stress increases by a factor of three at a dose of 10^7 rads. Mechanical stress is concentrated in the gate region, while thermal degradation is more uniform. The presence of localized stress may increase vulnerability to radiation damage and promote leakage current.
APPLIED PHYSICS LETTERS
(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
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
Engineering, Electrical & Electronic
Sergei P. Stepanoff, Aman Haque, Fan Ren, Stephen Pearton, Douglas E. Wolfe
Summary: The susceptibility of electronics to radiation increases as the size and complexity of electronic chips or systems increase. This study develops an indirect technique to identify radiation-susceptible regions and demonstrates its effectiveness in rapid detection.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2023)
Review
Materials Science, Ceramics
Douglas E. Wolfe, Caillin J. Ryan, Christopher M. DeSalle, Sergei P. Stepanoff, Benjamin I. Aronson, Zachary M. Boring, Justin A. Reiss, Patrick E. Albert, Jackson K. Nicastro, Aaron P. Fjeldsted
Summary: The value and impact of ceramic coatings in modern mechanical systems and protection against harsh environments are often overlooked. Ceramic coatings provide a robust protective barrier that outperforms other film barrier materials. This comprehensive review explores various aspects of modern ceramic coatings for barrier protection and highlights key functionalities, design architectures, processing effects, material classes, and future directions.
ADVANCES IN APPLIED CERAMICS
(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)
