Journal of The European Ceramic Society最新文献

{"title":"Novel (La0.2Ce0.2Pr0.2Nd0.2Gd0.2)2Hf2O7 high-entropy pyrochlore oxide as a promising TBC material","authors":"Gaius Cherian Mathew,&nbsp;Shijo Thomas","doi":"10.1016/j.jeurceramsoc.2025.117589","DOIUrl":"10.1016/j.jeurceramsoc.2025.117589","url":null,"abstract":"<div><div>High-entropy pyrochlore oxides are multi-cation solid solutions that have excellent high-temperature structural stability. They find application in fields like thermal insulation, catalysis, sensors, fuel cells, and optical and electronic devices, due to their compositional flexibility. While much research has focused on pyrochlore zirconates as a thermal barrier coating material, high entropy hafnates remain relatively unexplored although they have been reported to have better thermal characteristics. In this study, a novel high entropy pyrochlore hafnate, (La_0.2Ce_0.2Pr_0.2Nd_0.2Gd_0.2)₂Hf₂O₇, denoted as (LCPNG)HO, was designed, synthesized and characterized as a novel thermal barrier coating material. The high entropy oxide was synthesized through a solution combustion process using urea as fuel. The formation of phase-pure pyrochlore crystal structure was confirmed using characterization methods like XRD, Raman and HR-TEM with SAED. (LCPNG)HO exhibits excellent high temperature phase stability up to 1600 ℃ and has a uniform elemental distribution. The material exhibited excellent thermal stability with negligible mass changes in the temperature range of 25 – 1400 ℃, without any endothermic or exothermic processes being present. (LCPNG)HO exhibited a low thermal conductivity of 1.73 W/m.K and a coefficient of thermal expansion of 11.27 × 10⁻⁶ /K at 1000 ℃. The thermal conductivity value of (LCPNG)HO is lower than that of YSZ, a widely used TBC material. (LCPNG)HO also exhibited a wider UV-Vis absorption than YSZ and 20 % enhancement in IR absorbance, making it a suitable candidate for UV-IR shielding. The novel high entropy oxide displays an average hardness of 12.54 GPa and fracture toughness of 2.51 MPa.m^1/2 on dense sintered samples. Thermal ageing and cycling processes at high temperatures established that the high entropy oxide has excellent phase stability even after 150 h of ageing at 1400 ℃ and 15 cycles of heating and sudden cooling. (LCPNG)HO also exhibited excellent chemical compatibility with the thermally grown oxide, Al₂O₃. The results indicate that (LCPNG)HO has outstanding characteristics, suitable for thermal barrier coating application.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117589"},"PeriodicalIF":5.8,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195158","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}

{"title":"Role of waste glass as a fluxing agent in the sintering mechanism of porous ceramic aggregates from aluminium dross","authors":"Xinghan Huang ,&nbsp;Fengyi Zhang ,&nbsp;Xinyue Ma ,&nbsp;Chiu Chuen Onn ,&nbsp;Ying Pio Lim ,&nbsp;Heng Kam Lim ,&nbsp;Chou Yong Tan ,&nbsp;Kim Hung Mo","doi":"10.1016/j.jeurceramsoc.2025.117587","DOIUrl":"10.1016/j.jeurceramsoc.2025.117587","url":null,"abstract":"<div><div>This study presents an innovative approach to enhance the performance of porous ceramic aggregates (PCAs) produced from secondary aluminium dross (SAD) by incorporating waste glass powder (WGP). During the sintering process, aluminium nitride (AlN) in SAD acts as a pore-forming agent through its oxidation reaction, while the Na₂O and CaO in WGP serve as fluxing agents due to their low melting point. Mixtures containing 60 % brown clay and 40 % SAD with varying WGP contents (0–20 %) were sintered at 1150–1250 °C. The optimal addition of 15 % WGP resulted in the highest crushing strength of 5.3 MPa at 1200 °C and the lowest bulk density of 381 kg/m³ at 1250 °C. Microstructural observations confirmed a well-developed porous structure. Furthermore, heavy metal leaching concentrations were below regulatory limits, indicating environmental safety. These results demonstrate that incorporating WGP as a fluxing agent facilitates densification and pore formation, offering a sustainable route in PCAs production.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117587"},"PeriodicalIF":5.8,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144222512","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}

{"title":"Enhanced antimony telluride thermoelectric generators: From material synthesis to device applications","authors":"Nattharika Theekhasuk ,&nbsp;Rachsak Sakdanuphab ,&nbsp;Athorn Voraud ,&nbsp;Pichet Limsuwan ,&nbsp;Aparporn Sakulkalavek ,&nbsp;Nuttakrit Somdock","doi":"10.1016/j.jeurceramsoc.2025.117585","DOIUrl":"10.1016/j.jeurceramsoc.2025.117585","url":null,"abstract":"<div><div>This study investigates the effect of Bi₄O₄SeCl₂ (BOSC) addition (0–4 wt%) on the thermoelectric performance of p-type Bi₀.₅Sb₁.₅Te₃ synthesized via high-energy ball milling. XRD analysis revealed lattice incorporation at 1 wt% BOSC, while higher concentrations led to phase separation. The 1 wt% BOSC sample exhibited a significantly reduced total thermal conductivity of 0.28 W/m·K, compared to 0.46 W/m·K in the undoped sample, attributed to enhanced phonon scattering. Despite moderate decreases in electrical conductivity and Seebeck coefficient, a peak ZT of 1.02 at 50 °C was achieved—representing a ∼54 % improvement over the undoped material. Furthermore, a prototype thermoelectric module fabricated with BOSC-doped legs produced a power density of 17.6 mW/cm² under a 150 °C temperature gradient. These results demonstrate that BOSC is an effective additive for reducing thermal conductivity and enhancing overall thermoelectric performance, offering potential for energy harvesting applications at moderate temperatures.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117585"},"PeriodicalIF":5.8,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189896","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}

{"title":"Influence of tabular and white fused alumina aggregates on Young’s modulus evolution versus temperature in refractory castables","authors":"Kwasi Addo Boateng ,&nbsp;Robert Piotr Kaczmarek ,&nbsp;Jean-Michel Auvray ,&nbsp;Christoph Wöhrmeyer ,&nbsp;Elsa Thune ,&nbsp;Nicolas Tessier-Doyen ,&nbsp;Marc Huger","doi":"10.1016/j.jeurceramsoc.2025.117583","DOIUrl":"10.1016/j.jeurceramsoc.2025.117583","url":null,"abstract":"<div><div>The main alumina aggregates used in refractory applications are Tabular Alumina (TA) and White Fused Alumina (WFA). The different processing routes applied in producing TA and WFA greatly impact the final microstructure of these aggregates. The effects of the distinct microstructural properties in the aggregates in terms of grain sizes and porosity on the thermomechanical behaviour of refractory castables are not well understood. Young's modulus evolution with temperature was measured on alumina-based refractory castables containing either tabular or white fused alumina aggregates. Acoustic emissions were also measured to monitor microcracks developed in the refractory castables during cooling after being subjected to high temperatures. Fine TA and WFA aggregates were discovered to induce little to no microcracks in the refractory castables. Meanwhile, coarse WFA aggregates induced significant microcracks compared to TA aggregates in the alumina-based refractory castables. This paper has demonstrated successfully the influence of the varying grain sizes within alumina aggregates in promoting non-linear behaviour in refractory castables that potentially can be promising in thermal shock applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117583"},"PeriodicalIF":5.8,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144202447","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}

{"title":"In-situ formation mechanism and isothermal oxidation behaviors at 1700℃ and 1800℃ of (Zr,Hf)B2-(Hf,Zr)Si-HfCrSi2/TaSi2 composite coating prepared on Ta12W alloy by one-step vacuum reaction sintering","authors":"Tingyang Wang ,&nbsp;Xin Wang ,&nbsp;Tao Yang ,&nbsp;Shaopeng Wang","doi":"10.1016/j.jeurceramsoc.2025.117584","DOIUrl":"10.1016/j.jeurceramsoc.2025.117584","url":null,"abstract":"<div><div>Ta-W alloys with excellent mechanical properties above 1700℃ can rapidly fail due to “catastrophic” oxidation. In this investigation, a novel (Zr,Hf)B₂-(Hf,Zr)Si-HfCrSi₂/TaSi₂ coating was in-situ prepared via one-step vacuum reaction sintering on the Ta12W alloy. This coating remained intact after being respectively oxidized at 1700°C for 5 h and at 1800°C for 60 min. Oxide scales primarily composed of Ta₂O₅(TaO₂)-HfO₂-ZrO₂-B₂O₃-SiO₂ glass with (Hf,Zr)SiO₄ and (Hf,Zr)₆Ta₂O₁₇ at 1700°C and with (Hf,Zr)₆Ta₂O₁₇ at 1800°C were formed. The composite oxide scale could prevent the further oxidation of Cr₂O₃ at 1700℃. Additionally, micro-nano sized TaO₂ particles rather than Ta₂O₅ precipitated within the vitreous glass.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117584"},"PeriodicalIF":5.8,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203462","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}

{"title":"High-entropy aluminate spinel oxides: A pathway to advanced functional materials","authors":"Emilija Nidžović ,&nbsp;Branko Matović ,&nbsp;Peter Tatarko ,&nbsp;Naser Hosseini ,&nbsp;Ondrej Hanzel ,&nbsp;Lidija Radovanović ,&nbsp;Aleksandra Dapčević ,&nbsp;Marija Prekajski Đorđević","doi":"10.1016/j.jeurceramsoc.2025.117582","DOIUrl":"10.1016/j.jeurceramsoc.2025.117582","url":null,"abstract":"<div><div>This study investigates the synthesis and characterization of high-entropy aluminate spinel oxides (Al-HESOs) with three distinct compositions: (Co,Mn,Ni,Zn,Cu)Al₂O₄, (Co,Mn,Ni,Zn)Al₂O₄, and (Co,Mn,Ni,Mg)Al₂O₄. Using the self-propagating room temperature method for synthesis and spark plasma sintering for densification, single-phased Al-HESOs with relative densities up to 97 % were successfully obtained. Structural, mechanical, and thermal properties were comprehensively analysed, demonstrating significant tunability. Notably, the inclusion of Cu²⁺ drastically reduced the Young's modulus (3.8 GPa) while maintaining high hardness (9.9 GPa) and low thermal diffusivity (0.78 mm² s⁻¹ at room temperature – 0.63 mm² s⁻¹ at 600 °C), positioning (Co,Mn,Ni,Zn,Cu)Al₂O₄ as a promising candidate for strain-compliant thermal barrier coatings. These findings establish a novel synthesis and densification route for Al-HESOs and their potential for applications in advanced energy, sensing, and thermal management technologies.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117582"},"PeriodicalIF":5.8,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189897","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}

{"title":"Phase equilibrium and optical properties of intermediate phases in CaO–Nd2O3–Nb2O5 ternary system at 1200 °C","authors":"Bożena Pilarek,&nbsp;Irena Szczygieł","doi":"10.1016/j.jeurceramsoc.2025.117580","DOIUrl":"10.1016/j.jeurceramsoc.2025.117580","url":null,"abstract":"<div><div>Subsolidus phase equilibria in the CaO–Nd₂O₃–Nb₂O₅ ternary system and optical properties of the phases formed within this system have been investigated. Twenty-nine samples covering the entire composition range of the ternary oxide system were prepared using the ceramic method. Using powder X-ray diffraction (PXRD) and differential thermal analysis (DSC/TGA), isothermal cross-sections of the ternary system, distinguishing partial subsystems in the subsolidus region at 1200 °C, was constructed. The results highlight the formation of solid solutions and pseudo-binary eutectic systems with limited solid-state solubility and provide insights into the thermodynamic stability of the materials. Additionally, UV–visible diffuse reflectance spectra of calcium and neodymium niobates were analyzed, revealing promising absorption characteristics for photocatalytic and optoelectronic applications. The study emphasizes these materials' potential for designing high-performance sensors and devices with tunable optical properties.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117580"},"PeriodicalIF":5.8,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184866","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}

{"title":"Calcium oxide-stabilized zirconia with high toughness, strength, aging resistance and transformation-induced plasticity","authors":"Alberto Vettorel ,&nbsp;Bart Van Meerbeek ,&nbsp;Jef Vleugels ,&nbsp;Fei Zhang","doi":"10.1016/j.jeurceramsoc.2025.117581","DOIUrl":"10.1016/j.jeurceramsoc.2025.117581","url":null,"abstract":"<div><div>Monolithic zirconia ceramics generally present with trade-offs between toughness, strength and hydrothermal aging-resistance, highlighting the need to develop new zirconia ceramics that are better balanced for these key properties. In this study, zirconia containing 4.5 mol% calcium-oxide stabiliser (4.5Ca-TZP) was pressed from nanoparticles and pressureless sintered at 1200–1325°C. Fully dense 4.5Ca-TZP could be obtained at 1250–1275°C with a nanometric microstructure (average grain size &lt;100 nm) and about 20 wt% cubic-zirconia. Optimal mechanical properties were reached when sintered at 1250°C and 1275°C, combining a four-point-bending (4PB) strength of 1170 ± 140 MPa with a single-edge-V-notched-beam toughness of 9.73 ± 0.45 MPa m^1/2. Furthermore, this nanometric zirconia was highly transformable, showing transformation-induced plasticity before failure with an evident deviation from linear behavior starting around 75 % of the 4PB strength. Strikingly, 4.5Ca-TZP was also aging-resistant without degradation observed after 20 hours of aging at 134°C. Additionally, its translucency was similar to that of conventional 3Y-TZPs.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117581"},"PeriodicalIF":5.8,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203463","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}

{"title":"Influence of powder characteristics on the rheology of ceria-based screen-printing pastes for solid oxide cell applications","authors":"Denise J. Ramler ,&nbsp;Robert Mücke ,&nbsp;Christian Lenser ,&nbsp;Olivier Guillon ,&nbsp;Norbert H. Menzler","doi":"10.1016/j.jeurceramsoc.2025.117570","DOIUrl":"10.1016/j.jeurceramsoc.2025.117570","url":null,"abstract":"<div><div>Screen-printing is a widely utilized method for fabricating solid oxide electrolysis cells (SOECs), a promising technology for efficient hydrogen production. This study focuses on the rheological characterization of screen-printing pastes, emphasizing the influence of ceramic powder properties on rheological behavior and layer features. Conventional metrics such as viscosity, or binder and ceramic content provided in wt% are shown to inadequately describe paste characteristics. Instead, we propose the use of dynamic rheological properties, including damping factor and yield point, and introduce a bimodality coefficient <span><math><mi>φ</mi></math></span> to be able to quantify and correlate particle size distribution shapes with these rheological properties. Results demonstrate that dry layer thickness and dimensional accuracy correlate strongly with the damping factor, revealing that pastes with higher damping factors exhibit thinner layers due to increased viscous behavior. Additionally, increasing the amount of binder in relation to the specific surface area (SSA) of the ceramic particles weakens the 3-dimensional paste network, decreasing yield points and shifting paste behavior toward predominantly viscous behavior. Analysis of SSA as well as particle size distribution (PSD) and their correlation with rheology highlights the destabilizing effect of agglomerates in asymmetrical and bimodal particle size distributions, underscoring the need for comprehensive powder characterization.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117570"},"PeriodicalIF":5.8,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144222511","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}

{"title":"Formation and mechanism of carbon coating on carbon fibers through glucose-to-carbon conversion and its effect on the mechanical properties of Cf/ZrB2-SiC composites","authors":"Huiyi Fang ,&nbsp;Zonghao Sheng ,&nbsp;Wenxia Wang ,&nbsp;Chuncheng Wei ,&nbsp;Shuang Li ,&nbsp;Xin Geng ,&nbsp;Xiaowei Li ,&nbsp;Nannan Zhu ,&nbsp;Guangwu Wen ,&nbsp;Shun Dong ,&nbsp;Peng Wang","doi":"10.1016/j.jeurceramsoc.2025.117569","DOIUrl":"10.1016/j.jeurceramsoc.2025.117569","url":null,"abstract":"<div><div>The protection for carbon fibers is crucial for carbon fiber-reinforced materials. Carbon coatings were prepared on carbon fibers through gelation, hydrothermal caramelization and pyrolysis, with glucose as precursor of carbon. The glucose-to-carbon conversion mechanism was explored, as well as the effect of high pressure in hydrothermal reactor and the catalytic role of KCl. The high pressure suppressed gas escape and was beneficial to the formation of dense carbon coating. The KCl promoted the generation of 5-HMF, thereby accelerated the glucose-to-caramel conversion. C_f/ZrB₂-SiC composites were prepared by introducing ZrB₂-SiC slurry into the carbon fiber preform and hot press sintering. The carbon coating protected the carbon fibers from damage during sintering at high temperature. The carbon coating significantly improved the flexural strength, fracture toughness, and fracture work of C_f/ZrB₂-SiC composites from 122 MPa, 3.24 MPa‧m^1/2, and 231.6 J/m² to 321 MPa, 5.87 MPa‧m^1/2, and 567.1 J/m², respectively.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117569"},"PeriodicalIF":5.8,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178256","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}