Pub Date : 2026-08-01Epub Date: 2026-02-12DOI: 10.1016/j.jeurceramsoc.2026.118234
Jincheng Lin , Jiawei Bai , Sujun Liu , Lili Xing , Decai Ma , Xiujie He , Dongbai Sun , Tiesong Lin , Peng He , Weiqi Yang
The performance degradation caused by amorphization of crystals under irradiation is a critical challenge for glass-sealing joints applied in nuclear components. In this work, the behavior of phase separation of the Li2O-modified YAS glass was firstly used to join SiC ceramics. It’s found that the addition of Li2O promotes the separation of nanosized spherical quartz glass from the base glass above the softening temperature. Benefited from the “rigid-plastic” nanostructure, the glass with nanophase separation exhibit better indentation fracture toughness (1.1 MPa·m1/2) than the original glass (0.8 MPa·m1/2). The nanophase separation glass was successfully fabricated in the SiC brazing seam by pre-oxidizing proper thickness of SiO2 layer on SiC as well as applying a fast-cooling process, and the joint shear strength reached 129.8 ± 16.4 MPa, 44 % higher than the traditional joint with the same brazing glass. The possible toughing and formation mechanism of nanophase separation glass was discussed.
{"title":"Joining of SiC by Li2O-Y2O3-Al2O3-SiO2 glass with nanosized glassy phase separation","authors":"Jincheng Lin , Jiawei Bai , Sujun Liu , Lili Xing , Decai Ma , Xiujie He , Dongbai Sun , Tiesong Lin , Peng He , Weiqi Yang","doi":"10.1016/j.jeurceramsoc.2026.118234","DOIUrl":"10.1016/j.jeurceramsoc.2026.118234","url":null,"abstract":"<div><div>The performance degradation caused by amorphization of crystals under irradiation is a critical challenge for glass-sealing joints applied in nuclear components. In this work, the behavior of phase separation of the Li<sub>2</sub>O-modified YAS glass was firstly used to join SiC ceramics. It’s found that the addition of Li<sub>2</sub>O promotes the separation of nanosized spherical quartz glass from the base glass above the softening temperature. Benefited from the “rigid-plastic” nanostructure, the glass with nanophase separation exhibit better indentation fracture toughness (1.1 MPa·m<sup>1/2</sup>) than the original glass (0.8 MPa·m<sup>1/2</sup>). The nanophase separation glass was successfully fabricated in the SiC brazing seam by pre-oxidizing proper thickness of SiO<sub>2</sub> layer on SiC as well as applying a fast-cooling process, and the joint shear strength reached 129.8 ± 16.4 MPa, 44 % higher than the traditional joint with the same brazing glass. The possible toughing and formation mechanism of nanophase separation glass was discussed.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118234"},"PeriodicalIF":6.2,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-08-01Epub Date: 2026-02-04DOI: 10.1016/j.jeurceramsoc.2026.118212
Xinyu Wang , Ruipeng Wang , Jianli Jiang , Haining Meng , Haigang Hou , Jian Yang , Guiwu Liu , Guanjun Qiao
PbTe-based thermoelectric materials are promising for mid-temperature waste heat recovery, yet n-type PbTe underperforms its p-type counterpart. Herein, high-performance n-type PbTe is achieved through I/Ge co-doping and in-situ composite engineering with Sb2Te3 prepared by melting combined spark plasma sintering. Sb2Te3 alloying introduce in-situ formed Sb/Sb2Te3 precipitates. Furthermore, iodine doping optimizes the carrier concentration to ∼3.4 × 1019 cm–3, boosting the room-temperature electrical conductivity to ∼1404 S cm−1 and yielding a high power factor of ∼17.4 μW cm−1 K−2 for the PbTe-Sb2Te3 sample. Meanwhile, lattice thermal conductivity is synergistically suppressed to ∼0.37 W m–1 K–1 at 673 K through Ge-induced point defects/off-center anharmonicity and Sb/Sb2Te3 precipitates. This synergistic strategy results in a peak ZT of ∼1.30 at 823 K and a high average ZT of ∼0.91 at 323–823 K. This work demonstrates that synergistic I/Ge co-doping and composite precipitation effectively enhance thermoelectric performance in n-type PbTe.
基于PbTe的热电材料有望用于中温废热回收，但n型PbTe的性能不如p型。本文通过I/Ge共掺杂和原位复合工程，以熔融组合火花等离子烧结法制备Sb2Te3，实现了高性能n型PbTe。Sb2Te3合金引入原位形成的Sb/Sb2Te3相。此外，碘掺杂将载流子浓度优化到~ 3.4 × 1019 cm - 3，将PbTe-Sb2Te3样品的室温电导率提高到~ 1404 S cm - 1，并产生了~ 17.4 μW cm - 1 K - 2的高功率因数。同时，通过锗诱导的点缺陷/偏心不谐性和Sb/Sb2Te3析出，晶格热导率协同抑制到~ 0.37 W m-1 K - 1（673 K）。这种协同策略导致在823 K处ZT峰值为~ 1.30，在323-823 K处ZT峰值为~ 0.91。本工作证明了协同I/Ge共掺杂和复合沉淀有效地提高了n型PbTe的热电性能。
{"title":"Synergistic enhancement of thermoelectric performance in n-type Sb2Te3 alloyed PbTe via I/Ge co-doping","authors":"Xinyu Wang , Ruipeng Wang , Jianli Jiang , Haining Meng , Haigang Hou , Jian Yang , Guiwu Liu , Guanjun Qiao","doi":"10.1016/j.jeurceramsoc.2026.118212","DOIUrl":"10.1016/j.jeurceramsoc.2026.118212","url":null,"abstract":"<div><div>PbTe-based thermoelectric materials are promising for mid-temperature waste heat recovery, yet n-type PbTe underperforms its p-type counterpart. Herein, high-performance n-type PbTe is achieved through I/Ge co-doping and in-situ composite engineering with Sb<sub>2</sub>Te<sub>3</sub> prepared by melting combined spark plasma sintering. Sb<sub>2</sub>Te<sub>3</sub> alloying introduce in-situ formed Sb/Sb<sub>2</sub>Te<sub>3</sub> precipitates. Furthermore, iodine doping optimizes the carrier concentration to ∼3.4 × 10<sup>19</sup> cm<sup>–3</sup>, boosting the room-temperature electrical conductivity to ∼1404 S cm<sup>−1</sup> and yielding a high power factor of ∼17.4 μW cm<sup>−1</sup> K<sup>−2</sup> for the PbTe-Sb<sub>2</sub>Te<sub>3</sub> sample. Meanwhile, lattice thermal conductivity is synergistically suppressed to ∼0.37 W m<sup>–1</sup> K<sup>–1</sup> at 673 K through Ge-induced point defects/off-center anharmonicity and Sb/Sb<sub>2</sub>Te<sub>3</sub> precipitates. This synergistic strategy results in a peak ZT of ∼1.30 at 823 K and a high average ZT of ∼0.91 at 323–823 K. This work demonstrates that synergistic I/Ge co-doping and composite precipitation effectively enhance thermoelectric performance in n-type PbTe.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118212"},"PeriodicalIF":6.2,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2025-12-22DOI: 10.1016/j.jeurceramsoc.2025.118107
Huimin Xiang , Jie Fan , Siyuan Huang , Yiran Li , Yuchen Liu , Wenxian Li , Yanchun Zhou , Bin Liu
Porous ceramics with ultralow thermal conductivity and robust thermal stability are critical for advanced hypersonic vehicles. However, sintering and phase transitions of these materials have been critical problems. To address these issues, herein, we report the synthesis of multicomponent (Zn0.1Ca0.1Sr0.4Ba0.4)ZrO3 powders via solid-phase reaction and subsequent fabrication of sintering-resistant porous ceramics using a particle-stabilized foaming approach. By modulating solid loading (20–40 wt%), we achieved tailorable architectures with porosity levels of 81.6–92.3 % and compressive strengths of 0.97–4.50 MPa. The optimized material demonstrates ultralow room-temperature thermal conductivity (0.086–0.150 W/(m·K)), remarkably preserved at 0.232 W/(m·K) at 1000°C. Crucially, these ceramics exhibit exceptional thermomechanical stability with < 1 % linear shrinkage after 6 h heating at 1700°C and survive 200°C-quenching thermal shocks without catastrophic structural failure. These combined properties position (Zn0.1Ca0.1Sr0.4Ba0.4)ZrO3 porous ceramics as a promising candidate for ultrahigh-temperature insulation in aerospace and energy systems.
{"title":"Multicomponent (Zn0.1Ca0.1Sr0.4Ba0.4)ZrO3 porous ceramics for high-temperature insulation applications","authors":"Huimin Xiang , Jie Fan , Siyuan Huang , Yiran Li , Yuchen Liu , Wenxian Li , Yanchun Zhou , Bin Liu","doi":"10.1016/j.jeurceramsoc.2025.118107","DOIUrl":"10.1016/j.jeurceramsoc.2025.118107","url":null,"abstract":"<div><div>Porous ceramics with ultralow thermal conductivity and robust thermal stability are critical for advanced hypersonic vehicles. However, sintering and phase transitions of these materials have been critical problems. To address these issues, herein, we report the synthesis of multicomponent (Zn<sub>0.1</sub>Ca<sub>0.1</sub>Sr<sub>0.4</sub>Ba<sub>0.4</sub>)ZrO<sub>3</sub> powders via solid-phase reaction and subsequent fabrication of sintering-resistant porous ceramics using a particle-stabilized foaming approach. By modulating solid loading (20–40 wt%), we achieved tailorable architectures with porosity levels of 81.6–92.3 % and compressive strengths of 0.97–4.50 MPa. The optimized material demonstrates ultralow room-temperature thermal conductivity (0.086–0.150 W/(m·K)), remarkably preserved at 0.232 W/(m·K) at 1000°C. Crucially, these ceramics exhibit exceptional thermomechanical stability with < 1 % linear shrinkage after 6 h heating at 1700°C and survive 200°C-quenching thermal shocks without catastrophic structural failure. These combined properties position (Zn<sub>0.1</sub>Ca<sub>0.1</sub>Sr<sub>0.4</sub>Ba<sub>0.4</sub>)ZrO<sub>3</sub> porous ceramics as a promising candidate for ultrahigh-temperature insulation in aerospace and energy systems.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 7","pages":"Article 118107"},"PeriodicalIF":6.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145839131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Amorphous SiO2 doping is effective in refining grains and enhancing the mechanical properties of brittle ceramics. This study investigates 3YSZ continuous fibers doped with SiO2 additives. In situ high-temperature spherical aberration-corrected transmission electron microscopy reveals that liquid-like amorphous SiO2 at grain boundaries facilitates directional adsorption of small grains through capillary action, improving grain size uniformity. This reduces the curvature difference at grain boundaries, thus ultimately decreasing the grain annexation. Kinetic analysis reveals that intergranular amorphous SiO2 suppresses grain boundary diffusion in zirconia, rendering lattice diffusion dominant at elevated temperatures and suppressing grain coarsening. Small grain accumulation and grain-boundary amorphous SiO2 significantly reduce pore size, effectively relieving grain-boundary stress concentration. With 10 mol% SiO2 doping, fibers sintered at 1500 °C exhibit optimal performance, achieving 50 % smaller grains and 28 % higher tensile strength than undoped fibers.
{"title":"Mechanism of amorphous SiO₂ grain boundary modulation to inhibit abnormal grain growth and high-temperature strengthening of 3YSZ ceramic fibers","authors":"Youmei Wang , Ying Peng , Weiwei Qin, Luyi Zhu, Yongshuai Xie, Benxue Liu, Xinqiang Wang, Guanghui Zhang, Dong Xu","doi":"10.1016/j.jeurceramsoc.2026.118128","DOIUrl":"10.1016/j.jeurceramsoc.2026.118128","url":null,"abstract":"<div><div>Amorphous SiO<sub>2</sub> doping is effective in refining grains and enhancing the mechanical properties of brittle ceramics. This study investigates 3YSZ continuous fibers doped with SiO<sub>2</sub> additives. In situ high-temperature spherical aberration-corrected transmission electron microscopy reveals that liquid-like amorphous SiO<sub>2</sub> at grain boundaries facilitates directional adsorption of small grains through capillary action, improving grain size uniformity. This reduces the curvature difference at grain boundaries, thus ultimately decreasing the grain annexation. Kinetic analysis reveals that intergranular amorphous SiO<sub>2</sub> suppresses grain boundary diffusion in zirconia, rendering lattice diffusion dominant at elevated temperatures and suppressing grain coarsening. Small grain accumulation and grain-boundary amorphous SiO<sub>2</sub> significantly reduce pore size, effectively relieving grain-boundary stress concentration. With 10 mol% SiO<sub>2</sub> doping, fibers sintered at 1500 °C exhibit optimal performance, achieving 50 % smaller grains and 28 % higher tensile strength than undoped fibers.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 7","pages":"Article 118128"},"PeriodicalIF":6.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145940031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-01-24DOI: 10.1016/j.jeurceramsoc.2026.118169
Xiaomei Zeng , Heng Jiang , Rakhimbergan Rakhimov , Shavkat Yuldashev , Changwei Zou , Jun Zhang , Oleksandr Pohrebniak , Bing Yang , Sheng Liu , Vasiliy O. Pelenovich
Piezoelectric AlN thick films doped with Cr, Cu, Nb, Sc, Ta, Ti, Y, Zn, and Zr were deposited on Si and stainless-steel substrates using reactive RF magnetron sputtering. Planar Al sputter target with asymmetrically embedded disk of doping metal was employed in this study. The concentration of doping metal in the deposited films was a function of the distance between the substrate and the inlaid disk. Analysis of the film structure showed that, with the exception of ScAlN and ZnAlN films, the columnar structure and piezoelectric response of doped films were gradually degraded with increasing metal concentration. The piezoelectric d33eff constants of ScAlN (6.7 at% of Sc), ZnAlN (1.6 at% of Zn), NbAlN (1.2 at% of Nb), TiAlN (0.7 at% of Ti), and AlN films are 10.1 ± 0.5 pC/N, 5.3 ± 0.5 pC/N, 5.2 ± 0.5 pC/N, 5.2 ± 0.5 pC/N, and 5.6 ± 0.5 pC/N, respectively. Pulse-echo response of these films was studied using ultrasonic transducers and correlation between their piezoelectric d33eff constant and amplitude of the response was found.
采用反应性射频磁控溅射技术在Si和不锈钢衬底上制备了掺杂Cr、Cu、Nb、Sc、Ta、Ti、Y、Zn和Zr的压电AlN厚膜。采用不对称嵌入掺杂金属盘的平面铝溅射靶。沉积膜中掺杂金属的浓度是衬底与镶嵌盘之间距离的函数。对薄膜结构的分析表明，除了ScAlN和ZnAlN薄膜外，掺杂薄膜的柱状结构和压电响应随着金属浓度的增加而逐渐退化。的压电d33eff常量ScAlN (Sc) 6.7 %,ZnAlN锌(1.6 %),NbAlN Nb(1.2 %),TiAlN (Ti) 0.7 %,和AlN电影10.1 ±0.5 pC / N, 5.3±0.5 pC / N, 5.2±0.5 pC / N, 5.2±0.5 pC / N,和5.6 ±0.5 pC / N,分别。利用超声换能器研究了这些薄膜的脉冲回波响应，发现了它们的压电d33eff常数与响应幅度之间的相关性。
{"title":"The effect of metal doping on the piezoelectric response of AlN film ultrasonic transducers","authors":"Xiaomei Zeng , Heng Jiang , Rakhimbergan Rakhimov , Shavkat Yuldashev , Changwei Zou , Jun Zhang , Oleksandr Pohrebniak , Bing Yang , Sheng Liu , Vasiliy O. Pelenovich","doi":"10.1016/j.jeurceramsoc.2026.118169","DOIUrl":"10.1016/j.jeurceramsoc.2026.118169","url":null,"abstract":"<div><div>Piezoelectric AlN thick films doped with Cr, Cu, Nb, Sc, Ta, Ti, Y, Zn, and Zr were deposited on Si and stainless-steel substrates using reactive RF magnetron sputtering. Planar Al sputter target with asymmetrically embedded disk of doping metal was employed in this study. The concentration of doping metal in the deposited films was a function of the distance between the substrate and the inlaid disk. Analysis of the film structure showed that, with the exception of ScAlN and ZnAlN films, the columnar structure and piezoelectric response of doped films were gradually degraded with increasing metal concentration. The piezoelectric <em>d</em><sub><em>33</em></sub><sup><em>eff</em></sup> constants of ScAlN (6.7 at% of Sc), ZnAlN (1.6 at% of Zn), NbAlN (1.2 at% of Nb), TiAlN (0.7 at% of Ti), and AlN films are 10.1 ± 0.5 pC/N, 5.3 ± 0.5 pC/N, 5.2 ± 0.5 pC/N, 5.2 ± 0.5 pC/N, and 5.6 ± 0.5 pC/N, respectively. Pulse-echo response of these films was studied using ultrasonic transducers and correlation between their piezoelectric <em>d</em><sub><em>33</em></sub><sup><em>eff</em></sup> constant and amplitude of the response was found.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118169"},"PeriodicalIF":6.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-01-27DOI: 10.1016/j.jeurceramsoc.2026.118166
Mengrui Li , Xianmeng Chen , Boon Xian Chai , Guibing Shi , M. Akbar Rhamdhani , Li Wang , Shanqing Xu
This study proposes a novel CaTiO3 (CTO) doping strategy for MnZn ferrites to co-incorporate Ca2+ and Ti4+ ions, aiming to develop low power loss magnetic materials for megahertz-range frequency applications. The effects of CaTiO3 doping on power loss, cut-off frequency, and microstructure were systematically examined. As compared with traditional CaO and TiO2 doping, CaTiO3 doping enabled more uniform dopant distribution, refined grain structure, and enhanced electrical resistivity. Among all samples, the MnZn ferrites doped with CTO achieved an 87.5 % reduction in power loss (155 mW/cm3 at 1 MHz/30 mT/25 °C) relative to the undoped reference, while maintaining excellent magnetic performance. Loss separation analysis revealed that the major contribution to this improvement was the suppression of eddy current loss (Pe), complemented by reductions in hysteresis (Ph). This work demonstrates the great potential of CaTiO3 as a cost-effective, scalable, and efficient dopant for enhancing the high-frequency performance of MnZn ferrites in next-generation power electronics.
{"title":"Introduction of Ca2+ and Ti4+ ions by a novel additive CaTiO3 for manufacturing low power loss MnZn ferrites","authors":"Mengrui Li , Xianmeng Chen , Boon Xian Chai , Guibing Shi , M. Akbar Rhamdhani , Li Wang , Shanqing Xu","doi":"10.1016/j.jeurceramsoc.2026.118166","DOIUrl":"10.1016/j.jeurceramsoc.2026.118166","url":null,"abstract":"<div><div>This study proposes a novel CaTiO<sub>3</sub> (CTO) doping strategy for MnZn ferrites to co-incorporate Ca<sup>2+</sup> and Ti<sup>4+</sup> ions, aiming to develop low power loss magnetic materials for megahertz-range frequency applications. The effects of CaTiO<sub>3</sub> doping on power loss, cut-off frequency, and microstructure were systematically examined. As compared with traditional CaO and TiO<sub>2</sub> doping, CaTiO<sub>3</sub> doping enabled more uniform dopant distribution, refined grain structure, and enhanced electrical resistivity. Among all samples, the MnZn ferrites doped with CTO achieved an 87.5 % reduction in power loss (155 mW/cm<sup>3</sup> at 1 MHz/30 mT/25 °C) relative to the undoped reference, while maintaining excellent magnetic performance. Loss separation analysis revealed that the major contribution to this improvement was the suppression of eddy current loss (<em>P</em><sub><em>e</em></sub>), complemented by reductions in hysteresis (<em>P</em><sub><em>h</em></sub>). This work demonstrates the great potential of CaTiO<sub>3</sub> as a cost-effective, scalable, and efficient dopant for enhancing the high-frequency performance of MnZn ferrites in next-generation power electronics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118166"},"PeriodicalIF":6.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This research presents a novel UV-assisted drop casting approach for shaping ceramic microbeads from aqueous-based UV-curable alumina suspensions. The work focused on optimising suspension composition and shaping conditions to obtain dense microbeads with high sphericity. The effects of dispersant concentration, solid loading, monomer ratio, and photoinitiator content on rheology and UV curing were systematically investigated. The optimal suspension (42.5 vol% alumina; water:2-hydroxyethyl acrylate:poly(propylene glycol) dimethacrylate ratio 10:9:1; 5 wt% dispersant; 0.5 wt% photoinitiator) showed shear-thinning behaviour and a cure depth of 580 µm. Shaped droplets were UV-cured in a hydrophobic medium, and thermal analysis enabled controlled debinding and sintering. The best series yielded beads with an average diameter of 1262 µm, circularity up to 0.99, and low dimensional variability. Dense microstructures with minimal porosity were achieved, though surface delamination and grain coarsening occurred. The method enables efficient fabrication of spherical ceramic elements with high structural integrity.
{"title":"UV-assisted drop casting as a novel technique in fabrication of dense ceramic microbeads","authors":"Radoslaw Zurowski , Blanka Seredynska , Karolina Korycka , Aleksandra Szewczyk , Zofia Skowronska , Zofia Kostrzewska , Wiktor Drab , Joanna Tanska , Dominik Wolosz , Anna Wieclaw-Midor , Piotr Wiecinski , Justyna Zygmuntowicz , Dawid Kozien , Paulina Wiecinska , Gustavo Suárez , Pawel Falkowski","doi":"10.1016/j.jeurceramsoc.2026.118161","DOIUrl":"10.1016/j.jeurceramsoc.2026.118161","url":null,"abstract":"<div><div>This research presents a novel UV-assisted drop casting approach for shaping ceramic microbeads from aqueous-based UV-curable alumina suspensions. The work focused on optimising suspension composition and shaping conditions to obtain dense microbeads with high sphericity. The effects of dispersant concentration, solid loading, monomer ratio, and photoinitiator content on rheology and UV curing were systematically investigated. The optimal suspension (42.5 vol% alumina; water:2-hydroxyethyl acrylate:poly(propylene glycol) dimethacrylate ratio 10:9:1; 5 wt% dispersant; 0.5 wt% photoinitiator) showed shear-thinning behaviour and a cure depth of 580 µm. Shaped droplets were UV-cured in a hydrophobic medium, and thermal analysis enabled controlled debinding and sintering. The best series yielded beads with an average diameter of 1262 µm, circularity up to 0.99, and low dimensional variability. Dense microstructures with minimal porosity were achieved, though surface delamination and grain coarsening occurred. The method enables efficient fabrication of spherical ceramic elements with high structural integrity.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118161"},"PeriodicalIF":6.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-01-12DOI: 10.1016/j.jeurceramsoc.2026.118145
Qianqian Fan , Yanqin Fu , Fan Zhou , Junhao Zhao , Xue Li , Yuxin Li , Qingzhe Cui , Pei Wang , Yulei Zhang
Despite the improved ablation resistance offered by Hf-based ultra-high temperature ceramics (UHTCs) in carbon/carbon (C/C) composites, the porous oxide scales formed during ablation limits their long-term thermal stability, hindering advanced application. Herein, this work proposed the incorporation of Hf/Ti+Ta with varying molar ratios into C/C composites via reactive melt infiltration, and the resulting multi-component oxides after ablation promoted the formation of a dense oxide layer, thereby improving long-term ablation performance. The finding reveals that all samples were relatively dense and exhibited an identical layered structure around carbon fibers. Notably, the composites with a Hf/Ti/Ta molar ratio of 8:2:1 (8-HTT) exhibited superior ablation resistance, owing to the formation of a dense, adherent surface oxide layer, consisting of (Hf, Ti, Ta)O2 and HfTiO4. As the ablation duration increased to 240 s, the linear ablation rate for 8-HTT decreased to 0.7 μm/s, which was attributed to the self-healing effect enabled by low-melting-point oxide Hf6Ta2O17. This work establishes a theoretical foundation and optimization strategy for designing high-performance ablation-resistant C/C composites for extreme thermal environments.
{"title":"Tailoring the Hf/(Ti+Ta) ratio to achieve synergistic oxide-induced ablation resistance in C/C-(Hf, Ti, Ta)C-SiC composites","authors":"Qianqian Fan , Yanqin Fu , Fan Zhou , Junhao Zhao , Xue Li , Yuxin Li , Qingzhe Cui , Pei Wang , Yulei Zhang","doi":"10.1016/j.jeurceramsoc.2026.118145","DOIUrl":"10.1016/j.jeurceramsoc.2026.118145","url":null,"abstract":"<div><div>Despite the improved ablation resistance offered by Hf-based ultra-high temperature ceramics (UHTCs) in carbon/carbon (C/C) composites, the porous oxide scales formed during ablation limits their long-term thermal stability, hindering advanced application. Herein, this work proposed the incorporation of Hf/Ti+Ta with varying molar ratios into C/C composites via reactive melt infiltration, and the resulting multi-component oxides after ablation promoted the formation of a dense oxide layer, thereby improving long-term ablation performance. The finding reveals that all samples were relatively dense and exhibited an identical layered structure around carbon fibers. Notably, the composites with a Hf/Ti/Ta molar ratio of 8:2:1 (8-HTT) exhibited superior ablation resistance, owing to the formation of a dense, adherent surface oxide layer, consisting of (Hf, Ti, Ta)O<sub>2</sub> and HfTiO<sub>4</sub>. As the ablation duration increased to 240 s, the linear ablation rate for 8-HTT decreased to 0.7 μm/s, which was attributed to the self-healing effect enabled by low-melting-point oxide Hf<sub>6</sub>Ta<sub>2</sub>O<sub>17</sub>. This work establishes a theoretical foundation and optimization strategy for designing high-performance ablation-resistant C/C composites for extreme thermal environments.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118145"},"PeriodicalIF":6.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-01-22DOI: 10.1016/j.jeurceramsoc.2026.118164
Jiaqi He , Shaoyi Li , Minghao Xue , Peng Ji , Jingkun Yu , Lei Yuan
To overcome the inherent limitations in the physical properties of pure BaZrO3 ceramics, a solid-state reaction was employed to fabricate Yb-doped BaZrO3 ceramics with Yb doping levels of 1, 3, 5, and 7 wt%. The phase composition, defect structure, grain refinement mechanisms, and the impact of Yb doping concentration on the physical properties of the obtained ceramics was systematically studied. XRD analysis confirms that Yb dissolved into the Zr site of BaZrO3. The secondary phase Yb2Zr2O7 precipitates at grain boundaries when the Yb dopant concentration exceeds 3 wt%. The average grain size decreases significantly from 6 μm to 0.44 μm with the increasing of Yb dopping amount. This grain refinement arises from the decreased mobility of grain boundaries during sintering, resulting from both the point defect (such as ) due to Yb doping and the pinning effect exerted by the secondary Yb2Zr2O7 phase. The compressive strength peaks at 198 MPa for 3 wt% Yb doping, while thermal conductivity progressively decreases to 3.061 W·m−1·K−1 with Yb increasing dopant concentration. The improvement in physical properties stems from the synergistic effect of grain size, porosity, and point defects.
{"title":"Origin of grain refinement and influence on physical properties in Yb-doped BaZrO3 ceramics","authors":"Jiaqi He , Shaoyi Li , Minghao Xue , Peng Ji , Jingkun Yu , Lei Yuan","doi":"10.1016/j.jeurceramsoc.2026.118164","DOIUrl":"10.1016/j.jeurceramsoc.2026.118164","url":null,"abstract":"<div><div>To overcome the inherent limitations in the physical properties of pure BaZrO<sub>3</sub> ceramics, a solid-state reaction was employed to fabricate Yb-doped BaZrO<sub>3</sub> ceramics with Yb doping levels of 1, 3, 5, and 7 wt%. The phase composition, defect structure, grain refinement mechanisms, and the impact of Yb doping concentration on the physical properties of the obtained ceramics was systematically studied. XRD analysis confirms that Yb dissolved into the Zr site of BaZrO<sub>3</sub>. The secondary phase Yb<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> precipitates at grain boundaries when the Yb dopant concentration exceeds 3 wt%. The average grain size decreases significantly from 6 μm to 0.44 μm with the increasing of Yb dopping amount. This grain refinement arises from the decreased mobility of grain boundaries during sintering, resulting from both the point defect (such as <span><math><msubsup><mrow><mtext>V</mtext></mrow><mrow><mtext>O</mtext></mrow><mrow><mtext>••</mtext></mrow></msubsup></math></span>) due to Yb doping and the pinning effect exerted by the secondary Yb<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> phase. The compressive strength peaks at 198 MPa for 3 wt% Yb doping, while thermal conductivity progressively decreases to 3.061 W·m<sup>−1</sup>·K<sup>−1</sup> with Yb increasing dopant concentration. The improvement in physical properties stems from the synergistic effect of grain size, porosity, and point defects.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118164"},"PeriodicalIF":6.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-01-18DOI: 10.1016/j.jeurceramsoc.2026.118155
Lu Zhu , Nana Zhu , Pengju Tang , Baojing Zhang , Shengyuan Lei , Xiaohong Wang , Peizhong Feng
MoSi2‑based ceramics with superior high‑temperature nitridation resistance were developed through a dual strategy combining Al alloying and pre‑oxidation. A two-step route, self-propagating high-temperature synthesis followed by spark plasma sintering, was employed to prepare MoSi2 and Al-alloyed Mo(Si0.95Al0.05)2. Al incorporation and pre‑oxidation at 1500 °C produced dense Al–Si–O composite scales that merged the impermeability of SiO2 with the thermal stability of Al2O3. During direct nitridation at 1200 °C, the nitrogen diffusion coefficients of Mo(Si0.95Al0.05)2 decreased by 76% and 82% in the rapid (0–16 h) and slow (16–64 h) stages, and its overall mass change was much lower than that of MoSi2. Pre‑oxidation further enhanced protection, reducing diffusion coefficients to 0.005 and 0.001 mg/cm2·h0.5 compared with MoSi2 (0.007 and 0.004 mg/cm2·h0.5), due to the formation of stable Al–Si–O scales. Therefore, the pioneering dual strategy demonstrates a novel approach for developing advanced MoSi2-based ceramics with outstanding high-temperature nitridation resistance.
{"title":"Dual strategy to enhance the nitridation resistance of MoSi2-based ceramics for high-temperature applications","authors":"Lu Zhu , Nana Zhu , Pengju Tang , Baojing Zhang , Shengyuan Lei , Xiaohong Wang , Peizhong Feng","doi":"10.1016/j.jeurceramsoc.2026.118155","DOIUrl":"10.1016/j.jeurceramsoc.2026.118155","url":null,"abstract":"<div><div>MoSi<sub>2</sub>‑based ceramics with superior high‑temperature nitridation resistance were developed through a dual strategy combining Al alloying and pre‑oxidation. A two-step route, self-propagating high-temperature synthesis followed by spark plasma sintering, was employed to prepare MoSi<sub>2</sub> and Al-alloyed Mo(Si<sub>0.95</sub>Al<sub>0.05</sub>)<sub>2</sub>. Al incorporation and pre‑oxidation at 1500 °C produced dense Al–Si–O composite scales that merged the impermeability of SiO<sub>2</sub> with the thermal stability of Al<sub>2</sub>O<sub>3</sub>. During direct nitridation at 1200 °C, the nitrogen diffusion coefficients of Mo(Si<sub>0.95</sub>Al<sub>0.05</sub>)<sub>2</sub> decreased by 76% and 82% in the rapid (0–16 h) and slow (16–64 h) stages, and its overall mass change was much lower than that of MoSi<sub>2</sub>. Pre‑oxidation further enhanced protection, reducing diffusion coefficients to 0.005 and 0.001 mg/cm<sup>2</sup>·h<sup>0.5</sup> compared with MoSi<sub>2</sub> (0.007 and 0.004 mg/cm<sup>2</sup>·h<sup>0.5</sup>), due to the formation of stable Al–Si–O scales. Therefore, the pioneering dual strategy demonstrates a novel approach for developing advanced MoSi<sub>2</sub>-based ceramics with outstanding high-temperature nitridation resistance.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118155"},"PeriodicalIF":6.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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