Article
Materials Science, Ceramics
Hezhen Li, Lu Song, Jialin Sun, Jing Ma, Zhijian Shen
Summary: It has been found that there is a phenomenon of early surface densification in ceramics manufactured by stereolithography, which may have negative effects on the performance of ceramic components and needs to be controlled through optimization of the sintering protocol.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Austin D. Stanfield, Steven M. Smith, Suzana Filipovic, Nina Obradovic, Vladimir Buljak, Gregory E. Hilmas, William G. Fahrenholtz
Summary: The final-stage sintering process of zirconium diboride (ZrB2) ceramics was analyzed, and it was found that temperatures above 1900 degrees C and an applied uniaxial pressure of 50 MPa were necessary to achieve full density. Specimens sintered between 1900 and 2100 degrees C had relative densities greater than 97%, while those sintered below 1900 degrees C did not reach the final stage of sintering. The dominant mechanism for final-stage sintering was determined to be dislocation motion.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yeqing Ling, Xiandong Hao, Sirui Zhang, Jin Chen, Lei Gao, Mamdouh Omran, Guo Chen
Summary: In this study, zirconia ceramics were prepared by sintering nano-CeO2 (Ce = 7 mol%) doped zirconia powder under high-frequency microwave irradiation. The different effects of temperature environment on the phase structure transformation, surface functional groups, microstructure, growth process, and density of doped zirconia were analyzed, and the optimized microwave sintering process for zirconia was determined. The experimental results show that the tetragonal phase of zirconia is positively correlated with temperature, and the density and growth activation energy of zirconia are also related. Furthermore, the efficient heating of microwave and the incorporation of nano-ceria stabilizer affect the particle growth and phase transition temperature of zirconia.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Nouhaila Khalile, Christophe Meunier, Clemence Petit, Francois Valdivieso, Bartolomeo Coppola, Paola Palmero
Summary: Nowadays, ceramic parts with solid and complex shapes can be produced using rapid and efficient shaping and sintering techniques. This study utilized Digital Light Processing (DLP) for shaping and conventional (CV) and microwave (MW) sintering to produce 3mol% yttria stabilized zirconia (3Y-TZP) dense and lattice parts. MW sintering of 3Y-TZP samples with different heating rates and CV sintering were conducted, resulting in high final densities for both dense and lattice MW-sintered samples.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Xinghua Su, Mengying Fu, Gai An, Zhihua Jiao, Qiang Tian, Jumeng Wei
Summary: ZrO2/rGO nanocomposites were successfully fabricated using flash sintering, with in situ thermal reduction of graphene oxide during the process. This green and simple approach allows for the production of dense ceramic matrix nanocomposites reinforced with graphene at low temperatures in a short period of time, resulting in excellent mechanical properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Igor Danilenko, Marharyta Lakusta, Larisa Loladze, Galina Volkova, Valentina Glazunova, Igor Nosolev, Leonid Akhkozov, Tetyana Konstantinova
Summary: The research showed that increasing the contact area between particles can enhance the compaction effect under different pressures during the sintering process of 3Y-TZP nanopowder, affecting the transition between volume diffusion and grain boundary diffusion.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Ceramics
Abdu Abdallah, M. Sayed, M. Awaad, Adam H. E. Yousif, S. M. Naga
Summary: The study aimed to investigate the role of zirconia addition in mullite to improve mechanical properties and sinterability. Mullite-zirconia composites were produced with different zirconia levels and sintered at various temperatures. Results showed that increasing sintering temperature led to lower porosity and higher density, while higher zirconia content improved mechanical properties, with the MZ20 sample showing the highest bending strength when sintered at 1700 degrees C. Additionally, thermal expansion coefficient results varied based on zirconia content.
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2021)
Article
Chemistry, Multidisciplinary
Keena Trowell, Sam Goroshin, David Frost, Jeffrey Bergthorson
Summary: The reaction rate and hydrogen yield of aluminum particles were highest in high-density supercritical water, possibly due to the increased collision frequency. Decreasing the oxidizer density had minimal effect on hydrogen yield, except in vapor-density water where it significantly dropped.
Article
Materials Science, Ceramics
Seema Patil, Deepak Rajaram Patil, In Chul Jung, Jungho Ryu
Summary: This study systematically investigated the effect of cooling rates on the microstructural evolution and residual stress of ATZ composites after sintering. The results showed that the ATZ composite with a cooling rate of -1 degrees C/min exhibited the highest fracture toughness and the lowest tensile residual stress.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Biswajit Baruah, Naveen Kumar Yadav, Ritwik Sarkar
Summary: This study investigates the effect of incremental addition of zirconia (ZrO2) on the property development of magnesium aluminate spinel. The results show that adding ZrO2 aids in the densification of spinel and improves its grain structure and strength. ZrO2 also acts as a grain-growth inhibitor, restricting the growth of spinel grains and enhancing thermal shock behavior.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Environmental Studies
Cheonjae Lee, Jinbaek Park
Summary: This study analyzes the time-varying effect of interest rates on housing prices, finding that in Korea, the impact of interest rate shocks on housing prices increased significantly after the global financial crisis and reached its peak during the period of rising house prices from 2020 to 2021. This increasing impact is attributed to the increased dependence on loans for housing purchases.
Article
Materials Science, Multidisciplinary
Christian Oliver, Christopher A. Schuh
Summary: A new densification rate peak method for determining activation energies during sintering is proposed in this study, expanding the range of traditional analysis methods. The differences between the new analysis and traditional Kissinger analysis are compared and evaluated in multiple theoretical examples, and three previous sintering reports are re-examined using the new analysis.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Materials Science, Ceramics
Carolyn A. Grimley, Stephen Funni, Christopher Green, Elizabeth C. Dickey
Summary: In flash sintering experiments, the effect of temperature on the flash sintering of yttria-stabilized zirconia was examined. It was found that slower heating rates maximize final density, but processes that are too slow lead to grain growth. Except for grain boundary conductivity, most properties can be attributed to thermal profile.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Kamil Burak Dermenci
Summary: In this study, Li1.5Al0.5Ge1.5(PO4)(3) (LAGP) was introduced as a sintering aid into the garnet type Li7La3Zr2O12 (LLZO) structure. The addition of LAGP improved the densification and electrochemical performance of LLZO, but also led to the formation of open pores and cracking. The optimized LLZO sample with 1 wt % LAGP showed the best electrolytic properties and a lower activation energy, thanks to the continuous ion-conductive pathway facilitated by LAGP.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Mengyang Shi, Lei Zhang, Zhan Cheng, Zhentao Wang, Qun He, Jian Qin, Yongtao Jiu, Bin Tang, Dong Xu
Summary: The effects of La2O3 doping on the properties of varistor ceramics were studied, and it was found that La2O3 doping at 0.2 mol% exhibited the best electrical performance.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
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)