Article
Materials Science, Ceramics
Ammar Eqbal, Tamoghna Chakrabarti
Summary: Flash Sintering has the potential to significantly reduce sintering time and temperature. However, the presence of hotspots and electrochemical effects lead to heterogeneity in densification and microstructure in flash-sintered samples. By adding ZnO dopant (0.75-3 mol%) during flash sintering of 3YSZ, the extent of electrochemical reaction can be varied. Increasing the dopant concentration results in a substantial increase in grain size. Adding 0.75 mol% ZnO dopant significantly improves densification and reduces the presence of cracks, while also increasing electrochemical blackening.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Deborah Hagen, Joseph J. Beaman, Desiderio Kovar
Summary: The influence of interparticle neck radius to particle size ratio (X/R) on selective laser flash sintering (SLFS) in 8-YSZ was investigated. Experiment and finite element modeling provided valuable insights into the initiation mechanisms of SLFS.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Coatings & Films
Yujun Zhang, Gaoqi Wang, Tingting Kong, Shuo Yao, Junling Wu
Summary: This study aimed to improve the bonding strength between zirconia dentures and natural teeth by infiltrating synthesized fluorapatite glass-ceramics on the unsintered zirconia surface. Comprehensive evaluations of microstructure, phase characterization, surface morphology, mechanical properties, and bonding strength were conducted. The results showed that the infiltrated zirconia with fluorapatite glass-ceramics exhibited enhanced bonding strength and durability.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Yuki Ishino, Kimihiro Taguchi, Masao Koike, Tomoharu Tokunaga, Takahisa Yamamoto
Summary: By controlling the current ramping and maintaining constant shrinkage rates under specific electric field conditions, highly densified ZrO2 polycrystals doped with 3 mol% Y2O3 were obtained with fine grain size. The Vickers hardness and indentation fracture toughness of the material were similar to those obtained from conventionally thermally sintered compacts.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Koji Matsui, Junichi Hojo
Summary: This study investigates the sintering mechanism of YSZ ceramics and proposes the use of Al2O3 additive to enhance sintering. Experimental results show that a small amount of Al2O3 significantly improves the densification of the material and helps alleviate low-temperature degradation in zirconia ceramics by reducing the sintering temperature.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Omid Akhlaghi, Erik Camposilvan, Zahra Goharibajestani, Sirous Khabbaz Abkenar, Cleva W. Ow-Yang, Yves Jorand, Laurent Gremillard, Vincent Garnier, Jerome Chevalier
Summary: This work describes the development of transparent high-strength Yttria-Stabilized Zirconia (YSZ) ceramics with ultra-fine grain size. Utilizing conventional pressure-less densification, full densification and excellent light transmission were achieved. The resulting ceramics also exhibited high biaxial strength attributed to the refined microstructure and martensitic phase transformation.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Harry Charalambous, Shikhar Krishn Jha, K. S. N. Vikrant, R. Edwin Garcia, Xin Li Phuah, Han Wang, Haiyan Wang, Amiya Mukherjee, Thomas Tsakalakos
Summary: Experimental and simulation studies reveal that flash sintering under direct current can result in strain at grain boundaries and formation of nanopores, leading to sample fracturing and poor densification.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Ceramics
Seohyeon Jo, Syed I. A. Jalali, Rishi Raj
Summary: This report presents the retention of electronic conductivity in yttria-stabilized zirconia at room temperature after cooling down from the flash state. Flashing the specimens in Ar gas atmosphere results in higher conductivity compared to LN2-quenched samples. However, specimens flashed in air and air-cooled become insulating. The study also includes measurements of interface resistance at the anode and cathode using the four-point technique.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Rushi K. Kathiria, Seohyeon Jo, Rishi Raj, Devinder Yadav
Summary: Specimens triggered with flash heating can be held in Stage III both outside the furnace and immersed in liquid nitrogen, with the possibility of locking this state by turning off the power. Materials in this state exhibit metallic behavior, with a conductivity of approximately 11 S/m at room temperature, and enable ex-situ characterization of structural changes induced by flash activation.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Shintaro Kawabata, Shoma Takahashi, Kohta Nambu, Koji Morita
Summary: The effect of the flash event (FE) on microcrack healing behavior in 8 mol% yttria-stabilized zirconia was investigated under different electric field conditions and healing temperatures. The healing rate increased with crack length, indicating that external energy stored as crack surface energy played a role in driving the crack healing. The healing rate was significantly accelerated by the FE treatment under the AC electric field compared to the DC field, suggesting that nonthermal effects contributed to the enhanced healing behavior.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Subhadip Bhandari, Tarini Prasad Mishra, Olivier Guillon, Devinder Yadav, Martin Bram
Summary: Flash sintering is a novel technique that densifies ceramics at moderate furnace temperature and in short time. The mechanism behind flash sintering is not fully understood, but this study experimentally demonstrated that it is primarily dominated by Joule heating.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Joao V. Campos, Isabela R. Lavagnini, Viviana Avila, Bola Yoon, Sanjit Ghose, Rishi Raj, Eliria M. J. A. Pallone, Lilian M. Jesus
Summary: This study investigates the Arrhenius behavior of electrical conductivity during flash sintering of 3 mol% yttria stabilized zirconia. Total conductivity was found to follow an Arrhenius-like equation in both dense and green samples, with non-linearity related to furnace temperature. A change in activation energy for conduction prior to the flash event was observed and discussed.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Ceramics
C. H. Jeong, E. Vijayakumar, H. G. Lee, W. H. Lee
Summary: In this work, different yttria-stabilized zirconia-titanium (YSZ-Ti) composite compacts were fabricated using electric discharge sintering (EDS) and spark plasma sintering (SPS) methods. The microstructures and mechanical properties of the compacts were analyzed and compared. The results showed that the EDS composite compacts had a uniform distribution of YSZ throughout the Ti matrix, resulting in significantly improved mechanical properties. On the other hand, in the SPS composite compacts, the YSZ content was mainly agglomerated and dispersed at the Ti particle boundaries. The mechanical properties of the SPS compacts were enhanced with increasing YSZ content but not as much as the EDS processed compacts.
CERAMICS INTERNATIONAL
(2022)
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
Materials Science, Ceramics
Vladimir Prajzler, Karel Maca, Premysl St'astny, Richard Todd
Summary: The study found that in flash sintered 3YSZ ceramics, the microstructural homogeneity decreased with increasing direct current density and dwell time in a flash state, eventually leading to abnormal grain growth.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Deborah Hagen, Joseph J. Beaman, Desiderio Kovar
Summary: The influence of interparticle neck radius to particle size ratio (X/R) on selective laser flash sintering (SLFS) in 8-YSZ was investigated. Experiment and finite element modeling provided valuable insights into the initiation mechanisms of SLFS.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Deborah Hagen, Joseph J. Beaman, Desiderio Kovar
Summary: Selective laser flash sintering (SLFS) is a flash sintering variation that utilizes a scanning laser as the only external heat source. This study focuses on understanding the charge transport mechanisms during stage I SLFS in yttria stabilized zirconia. Experimental results show that both a discrete bundle of charges and continuous flow of charge carriers contribute to the current at the initiation of SLFS.
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)