Article
Thermodynamics
Xiang Yang, Yanping Du, Qian Xu, Feitong Wu, Tao Zhou, Changying Zhao
Summary: In this study, a pores integrated fractal model was established to accurately predict the thermal conductivity, permeability, and diffusion coefficient in porous materials. The influence of equivalent pore distributions on heat conduction and permeation was analyzed.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Multidisciplinary
Georgia Sourkouni, Christos Argirusis
Summary: The goal of this study was to quantify degradation phenomena on anodes attributed to chemical and/or electrochemical sintering, and to propose countermeasures. The results showed that humidity is an important factor affecting microstructural changes, and tortuosity, porosity, and specific resistance change with time depending on the fuel humidity. The EIS results confirmed the influence of microstructural changes on the electrochemical properties of the cells through the increasing specific resistance.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Cunhui Yuan, Haiqing Yin, Guoqiang Yang, Xin Yang, Bin Xu, Zhenghua Deng, Yangfan Liu, Wei Li, Cong Zhang, Ruijie Zhang, Xuanhui Qu
Summary: Transition metal borides have enabled applications in cutting tools, but face challenges in fabrication due to high temperature requirements and phase balance issues. A WCoB-Co cermets was prepared using in situ synthesis with elemental powders and studied for microstructure evolution, phase evolution and mechanical properties. Results indicated that increasing boron content was beneficial in eliminating the detrimental Co7W6 phase for mechanical properties optimization.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Valeriya Zarubina, Ignacio Melian-Cabrera
Summary: The study explores the thermal effects on inorganic catalytic supports during reactivation, focusing on changes in structure and pore size trajectory. The pore size changes are influenced by temperature, sintering mechanism, and densification of the material, rather than just a reduction in surface area.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Ceramics
Stephen Sehr, Virginia Collier, Frank Zok, Matthew R. Begley
Summary: The oxidation of SiC is crucial to the durability of ceramic matrix composites due to the generation of significant stresses from large changes in molar volume, which can lead to cracking in adjacent features. This paper presents a two-dimensional finite element framework that uses a single finite element mesh to predict these behaviors. The framework's numerical performance is illustrated using an analytical description of oxidation of a flat surface and subsequent stress evolution. It is also used to analyze internal oxidation within a cylindrical cavity for a wide range of temperatures and water vapor concentrations pertinent to gas turbines.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Construction & Building Technology
Peiqi Zheng, Xiuzhi Zhang, Yanyu Shi, Haoyang Sun, Maoqiang Fu, Guangbin Duan
Summary: This study introduced hollow microspheres of different sizes into foam concrete to control the pore structure. The results showed that the diameter of isolated pores influenced the properties of foam concrete, but the relationship between pore connectivity and pore diameter distribution remained difficult to characterize.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Thermodynamics
Weizhuo Li, Qing Du, Guannan Guo, Chengru Wu, Kui Jiao
Summary: To eliminate endurance anxiety, lithium-ion batteries need to continuously improve energy densities by developing ultrathick electrodes that compress the proportion of inactive components. This study introduces two variants of oriented pore structures for fast ion transport and uses a quasi-3D electrochemical-thermal coupled model to investigate their behavior. The results show significant improvements in energy density and more uniform ion distribution, with reduced heat generation rate in high discharge rate conditions.
APPLIED THERMAL ENGINEERING
(2023)
Article
Materials Science, Ceramics
J. L. Amoros, E. Blasco, A. Moreno, C. Feliu
Summary: This study investigated the thermal treatment of industrial spray-dried porcelain stoneware compacts, and found that the physical properties and phase content of the porcelain were independent of the thermal treatment.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Leilei Shi, Jiantao Zhou, Hui Li, Sheng Liu, Shengnan Shen, Haocheng Wang, Qi Tian, Shifeng Wen, Junwen Lu
Summary: In this study, the evolution mechanism of multiple pores during metal additive manufacturing was investigated using laser postprocessing. Micro-CT technology was employed to measure the reduction of porosity on both Ti6Al4V and AlSi10Mg samples after laser postprocessing. Numerical simulations were conducted to study the laser post-processing mechanisms of the two alloys, and the impact of preheating temperature on porosity reduction was discussed.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Ceramics
Shijia Li, Chonggao Bao, Haiqiang Ma, Wencai Dong, Suocheng Song, Qing Wang, Rongzhen Liu, Peiyao Wu
Summary: Porous diatomite ceramics with hierarchical pores and high apparent porosity were successfully fabricated via direct stereolithography. By controlling the pre-ball-milling time, dispersant type and concentration, as well as the pyrolysis and sintering process parameters, diatomite pastes and ceramics with desired properties were achieved.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Zoe Roulon, Jean-Michel Missiaen, Sabine Lay
Summary: This study investigates the effects of binders on shrinkage and microstructure evolution of cemented carbides, comparing Co used in the industry to Fe and Ni binders. It is found that WC-Fe requires a higher temperature for solid state sintering compared to WC-Co and WC-Ni alloys. Discussions in this study involve densification mechanisms in relation to dilatometry results, microstructural analyses, DFT calculations, and a theoretical kinetic model from literature.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Engineering, Chemical
Lihua Gao, Peixin Liu, Wenlong Zhan, Junhong Zhang, Zhijun He, Xinmei Hou
Summary: This study investigates the formation process of complex calcium ferrite in high basicity, high iron, and low silicon sinter. The phase transformation and morphology evolution of Fe2O3-Fe3O4-CaO-SiO2 systems roasted in air atmosphere are analyzed. The experimental results show that the prolonged roasting time and higher temperature promote the formation of stable calcium ferrite phases. The formation of calcium ferrite is crucial for the quality of sintered products.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Wei Lv, Min Gan, Xiaohui Fan, Zengqing Sun, Rongchang Zhang, Zhiyun Ji, Xuling Chen
Summary: Iron ore sintering is a simple and sustainable method for treating zinc-bearing secondary resources. This study investigated the behavior of zinc during sintering by combining thermodynamic calculation and simulation tests. The results showed that zinc primarily transformed into ZnO and ZnFe2O4, and ZnFe2O4 remained stable at high temperatures and low CO concentrations. Under conventional sintering conditions, the removal rate of zinc was approximately 5 wt%.
Article
Materials Science, Ceramics
Wentao Jiang, Huizhong Zhao, Jun Yu, Han Zhang
Summary: It is significant to develop new types of refractories using porous refractory aggregates to replace traditional ones for long-term operations of high-temperature industries with low carbon emissions. In this study, microporous MgAl2O4 aggregates with sub-micron pores were successfully prepared and their sintering temperature effects on phase compositions, sintering properties, and microstructure were studied. The resulting aggregates exhibited superior comprehensive performance, with median equivalent pore diameter of 10.75 μm, bulk density of 2.27 g cm-3, closed porosity of 8.7%, thermal conductivity of 1.932 W m-1 k-1 at 500 °C, and compressive strength of 40.8 MPa. The formation mechanism of submicron pores and their effects on thermal conductivity and compressive strength were discussed.
CERAMICS INTERNATIONAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Yufeng He, Shaogang Wang, Jian Shen, Dong Wang, Yuzhang Lu, Langhong Lou, Jian Zhang
Summary: The evolution of micro-pores in a single crystal nickel-based superalloy during creep at 980 degrees C/220 MPa was investigated using X-ray computed tomography. The results show that the formation and growth of micro-pores mainly occur at the end of secondary/beginning of tertiary creep stage. The irregular large pores and high density pores located at strain concentration region are the major factors leading to creep damage. Creep failure is caused by the connection of surface cracks induced by oxidation and the internal cracks generated from growth and merging of micro-pores.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(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)