Open Ceramics最新文献

{"title":"Foam concrete with mineral additives: from microstructure to mechanical/physical properties, workability and durability","authors":"Alassane Compaore ,&nbsp;Jean-Yves N’Zy Kicoun Toure ,&nbsp;Desmond Edem Primus Klenam ,&nbsp;Abdallah Sarroney Merenga ,&nbsp;Tabiri Kwayie Asumadu ,&nbsp;John David Obayemi ,&nbsp;Nima Rahbar ,&nbsp;Charles Migwi ,&nbsp;Winston Oluwole Soboyejo","doi":"10.1016/j.oceram.2025.100812","DOIUrl":"10.1016/j.oceram.2025.100812","url":null,"abstract":"<div><div>This paper explores foam concretes produced from cement, sand, water, foaming agents and secondary cementitious materials (SCMs). We examine the effects of these constituents on the microstructure, mechanical/physical properties, workability, and the durability of foam concrete. The contributions of SCMs are assessed based on their pozzolanic activity. Various SCMs, through their pozzolanic reactivity, contribute significantly to pore refinement, matrix densification, and the enhancement of mechanical strength, thermal conductivity and durability characteristics, including resistance to water ingress, chloride penetration, and sulfate attack of foam concrete mixes. While the SCMs incorporation leads to improved strength, it may also increase brittleness, which can be balanced with the addition of fibers. Furthermore, the workability is greatly affected by the incorporation of SCMs, which often have a negative effect on reducing it. The paper highlights the opportunities to use metakaolin as an SCM for the optimization of foam concrete mechanical, durability and thermal properties.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100812"},"PeriodicalIF":2.9,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144534187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Boron nitride nanosheets as an effective strategy against the slow crack growth and hydrothermal ageing in zirconia composites","authors":"C. Muñoz-Ferreiro ,&nbsp;A. Morales-Rodríguez ,&nbsp;H. Reveron ,&nbsp;E. Guisado-Arenas ,&nbsp;S. Cottrino ,&nbsp;P. Moreno ,&nbsp;J. Prada-Rodrigo ,&nbsp;J. Chevalier ,&nbsp;Á. Gallardo-López ,&nbsp;R. Poyato","doi":"10.1016/j.oceram.2025.100816","DOIUrl":"10.1016/j.oceram.2025.100816","url":null,"abstract":"<div><div>This paper explores the effectiveness of boron nitride nanosheets in preventing the premature failure of yttria-stabilized tetragonal zirconia ceramics, particularly in humid environments. A simple, low-cost and scalable technique -shear exfoliation in a kitchen blender- was used to prepare BNNS, and pure zirconia and composites with 1, 2.5 and 5 vol. % BNNS were spark plasma sintered. Accelerated hydrothermal ageing experiments in autoclave revealed a remarkable improvement of low temperature degradation resistance in all the composites. Fracture toughness and slow crack growth of the composites with 1 and 2.5 vol. % BNNS were evaluated by bending tests performed in notched specimens. Although the composites presented fracture toughness values similar to those of the reference zirconia, an increase of ∼18 % on crack-tip toughness was achieved. Similar R-curves evaluated in air and in oil-impregnated 2.5 vol. % BNNS composites revealed a limitation of stress-assisted corrosion by water in zirconia, thanks to the BNNS incorporation.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100816"},"PeriodicalIF":2.9,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A quaternary high entropy (Er1/4Sc1/4Tm1/4Yb1/4)2SiO5 monosilicate with low thermal conductivity and excellent resistance to CMAS corrosion","authors":"Sehreish Abrar,&nbsp;Faisal Nazeer","doi":"10.1016/j.oceram.2025.100811","DOIUrl":"10.1016/j.oceram.2025.100811","url":null,"abstract":"<div><div>The matched CTE with SiC-based ceramics composites, low thermal conductivity and better corrosion resistance against calcium-magnesium-aluminosilicate (CMAS) are the basic requirements for suitable thermal/environmental barrier coating materials for silicon-based ceramics. Rare earth silicates have better corrosion resistance against CMAS and water vapor but their high thermal conductivity and higher value of CTE limit their applications. Inspired by the high entropy effect, a new quaternary (Er_1/4Sc_1/4Tm_1/4Yb_1/4)₂SiO₅ or (4RE_1/4)₂SiO₅ monosilicate was fabricated to improve the overall performance. The TEM analysis shows the uniform mixing of powders after synthesis. The as-synthesized (4RE_1/4)₂SiO₅ monosilicate shows a matched CTE value of 3 to 5.5 × 10^–6/K with SiC-based composites due to severe lattice distortion and chemical bonding variation. The point defects, including mass mismatch and oxygen vacancies, lead to a lower thermal conductivity value (1.2 W/m·K) of (4RE_1/4)₂SiO₅ monosilicate. Furthermore, the quaternary (4RE_1/4)₂SiO₅ monosilicate also shows better resistance against CMAS at high temperatures and for longer periods. Overall, the above (4RE_1/4)₂SiO₅ monosilicate is a suitable candidate to use as T/EBC material.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100811"},"PeriodicalIF":2.9,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of organic additives in fabrication processes on the electrical properties of gadolinium-doped ceria as an electrolyte for solid oxide fuel cell applications","authors":"E. Bonnet ,&nbsp;M.C. Steil ,&nbsp;C. Jourde ,&nbsp;P.-M. Geffroy ,&nbsp;J.-M. Bassat","doi":"10.1016/j.oceram.2025.100806","DOIUrl":"10.1016/j.oceram.2025.100806","url":null,"abstract":"<div><div>This work is focused on the impact of the fabrication processes of gadolinia ceria electrolyte on its ionic conductivity at low and moderate temperatures (200–800 °C). The results obtained in this study show that the possible chemical contaminations in the raw materials during the fabrication process have a large impact on the final electrical properties of the oxide, in particular at low temperatures (450 &lt; <em>T</em> °<em>C</em> &lt; 550 °C). Indeed, the bulk conductivity of gadolinia ceria is not affected by the fabrication process (pressing or tape casting) but, in opposite, the electrical properties of grain boundaries in the material are largely affected by the fabrication process of electrolyte, and by the chemical contamination linked to the use of organic additives during the shaping steps.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100806"},"PeriodicalIF":2.9,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144480194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis, microstructure, growth kinetics and oxidation performance of complex concentrated silicide coatings on Nb₇Ti₇Al₁Cr₁ via hot-dip siliconizing","authors":"Willian M. Pasini ,&nbsp;Spyridion H. Borges ,&nbsp;Filip Kateusz ,&nbsp;Ewa Rząd ,&nbsp;Nabil Chaia ,&nbsp;Neide A. Mariano ,&nbsp;Wojciech Polkowski","doi":"10.1016/j.oceram.2025.100810","DOIUrl":"10.1016/j.oceram.2025.100810","url":null,"abstract":"<div><div>For different types of materials, particularly those exposed to high-temperatures, applying protective coatings significantly increases their resistance to oxidation. In this study, for the first time, the hot-dip method was used to synthetize silicides-based coatings on a refractory complex concentrated alloy substrate Nb₇Ti₇Cr₁Al₁. Coatings were applied by dipping the substrates in molten Al-30Si alloy at 850 °C for different time periods. Using XRD and SEM/EDS methods aphase, microstructure, and chemical composition of the coatings were analyzed, revealing a primary M(Si,Al)₂ layer. The coating thickness increased linearly with deposition time, indicating interfacial reaction-controlled growth. Notably, a 10-minute coating synthesis significantly improved oxidation performance. Short-term oxidation tests at 1200 °C for 20 h in synthetic air showed linear kinetics for the base alloy, while the coated sample exhibited parabolic behavior and 87 % reduced mass gain. These findings demonstrate the potential of liquid-assisted siliconizing for producing oxidation-resistant coatings.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100810"},"PeriodicalIF":2.9,"publicationDate":"2025-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eco-friendly synthesis of selenium nanoparticles using Cuminum cyminum L extract: Evaluating their cytotoxicity, antimicrobial properties, and photocatalytic efficiency","authors":"Fatemeh Nazarzadeh ,&nbsp;Saied Navabpour ,&nbsp;Zahra Sabouri ,&nbsp;Majid Darroudi","doi":"10.1016/j.oceram.2025.100809","DOIUrl":"10.1016/j.oceram.2025.100809","url":null,"abstract":"<div><div>In this study, selenium nanoparticles (Se-NPs) were synthesized through a sustainable and eco-friendly method utilizing <em>Cuminum cyminum</em> L. (cumin) extract. The bioactive compounds in the extract act as natural reducing agents and stabilizers. The morphological, optical, and functional attributes of Se-NPs were analyzed with a focus on their photocatalytic applications, cytotoxicity, and antimicrobial activities. UV–Vis, XRD, and TEM analyses confirmed that Se-NPs were mainly amorphous with a spherical shape. The photocatalytic evaluation showed that Se-NPs effectively degraded organic dyes when exposed to UV light, highlighting their potential for environmental purification. The MTT assay evaluated the potential cytotoxicity of Se-NPs toward the cancerous CT26 cells and showed targeted anticancer activity with an IC₅₀ value of 309.9 µg/mL after 48 h. The agar diffusion approach was used to study the bactericidal effects of Se-NPs against <em>Escherichia coli</em> and <em>Staphylococcus aureus</em>; the appearance of clear inhibitory zones confirmed the antimicrobial properties of Se-NPs.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100809"},"PeriodicalIF":2.9,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The role of carbon presence on the strontium hexaferrite phase decomposition during pressureless spark plasma sintering (pSPS)","authors":"A. Učakar ,&nbsp;A. Kocjan ,&nbsp;B. Belec ,&nbsp;J. Košir ,&nbsp;T. Kallio ,&nbsp;M. Kržmanc Maček ,&nbsp;B. Arah ,&nbsp;P. Jenuš Belec","doi":"10.1016/j.oceram.2025.100804","DOIUrl":"10.1016/j.oceram.2025.100804","url":null,"abstract":"<div><div>The phase composition and microstructure of Sr-hexaferrite (SFO) ceramics govern the hard magnetic properties. Here, pressureless spark plasma sintering (pSPS) technique was employed for the rapid consolidation (500 °C/min) of SFO in a radiating graphite crucible under vacuum and, thus, reductive conditions. A numerical model depicting the temperature profile within the heating crucible was constructed to understand the temperature evolution within the samples. The combination pSPS sintering environment (graphite heating crucible under vacuum) promoted phase decomposition to Sr-enriched and depleted phases of various morphological variations, leading to reduction of hard magnetic properties. Notably, certain newly formed phases exhibited lower melting points, inducing a shift in the sintering mechanism from solid-state sintering to a partial liquid-phase sintering mechanism.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100804"},"PeriodicalIF":2.9,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monitoring the stability of therapeutic ions in SBF","authors":"H. Kaňková ,&nbsp;A. Švančárková ,&nbsp;L. Buňová ,&nbsp;D. Galusek ,&nbsp;D. Galusková","doi":"10.1016/j.oceram.2025.100777","DOIUrl":"10.1016/j.oceram.2025.100777","url":null,"abstract":"<div><div>For the assessment of potentially bioactive materials, in vitro tests are performed in simulating body fluid (SBF) to prove its hydroxyapatite-forming ability and its biodegradability based on ions released into the solution. Information on ion release is essential for understanding the biological activity of both the ions and the materials as a whole. To understand these processes, it is important to accurately determine the concentration of elements in a complex SBF matrix. Most published studies are not performed consistently, do not take into account the specifics of the method, and possible interactions, or do not provide information on the protocols applied to achieve stability of the solutions analysed. In our study, we performed model experiments aimed at verifying the determination of ions in SBF when the sample is and is not suitably treated for its storage.</div><div>The first experiment investigated the simulation of the long-term stability of ions in SBF samples collected after in vitro test of apatite formation (often incorrectly stated as bioactivity test). SBF solutions were spiked with Al, B, Ce, Cu, Ga, Sr, Y, and Zn at 0.5, 2.5, and 10 mg/L concentrations and determined within 1 h. The concentration of spiked solutions was analyzed again after 7 and 14 days. Elemental recovery was evaluated in comparison with solutions containing the same amounts of these elements but treated with nitric acid to achieve pH ∼ 2. The second experiment focused on stratifying the ion concentrations in the tubes during the ICP-OES measurement. The difference between the analysis performed immediately after the addition of the elements of interest to the solution and the analysis performed 3 h later was determined in the three positions of the tubes.The changes in the measured concentration significantly different than the nominal values for the Al, Ce, Y, and Zn were detected. If the concentration of these ions decreases, phosphorus and calcium have been removed from the solution and vice versa. This indicates that these ions get trapped in the precipitates and complexes formed. A protocol of recommended sample handling procedures was developed to avoid potential errors and inconsistencies when storing the SBF sample after leaching tests (also known as ion release test) before ICP-OES analysis.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"22 ","pages":"Article 100777"},"PeriodicalIF":2.9,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mineralogical and microstructural changes in fused cast Ti-stabilized alumina-zirconia eutectic ceramics at elevated temperatures","authors":"Annalena Erlacher ,&nbsp;Adrian Villalba Weinberg ,&nbsp;Christian L. Lengauer ,&nbsp;Andreas Börger","doi":"10.1016/j.oceram.2025.100798","DOIUrl":"10.1016/j.oceram.2025.100798","url":null,"abstract":"<div><div>Ti-stabilized alumina-zirconia eutectic ceramics produced by fusion-casting are characterized to investigate microstructural mechanisms at elevated temperatures and to explain the self-sharpening effect. Scanning electron microscopy (SEM) images show fine-grained lamellar eutectic microstructures with well-defined domains. After thermal annealing at 800 °C, distinct cracks formed along the domain boundaries. Thermal analyses and powder X-ray diffraction (pXRD), using Rietveld evaluation, confirmed that the cracks are triggered by the phase transformation from meta-stable tetragonal to monoclinic ZrO₂, causing a volume increase of up to 13.4 %. This indicates a decrease in the stabilizing effect of Ti in the meta-stable tetragonal ZrO₂ starting from 669 °C, and subsequently triggering the phase transformation. Additionally, structural analysis of pXRD data reveals internal stresses within the crystal lattice, showing expansion of tetragonal ZrO₂ along the <em>c</em>-axis and distortions in the basal plane in both tetragonal and monoclinic ZrO₂.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"22 ","pages":"Article 100798"},"PeriodicalIF":2.9,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Co–extrusion of alumina core–shell structures fabricated by robocasting","authors":"Michelle Weichelt ,&nbsp;Larissa Wahl ,&nbsp;Nahum Travitzky ,&nbsp;Tobias Fey","doi":"10.1016/j.oceram.2025.100805","DOIUrl":"10.1016/j.oceram.2025.100805","url":null,"abstract":"<div><div>Porous ceramics have a wide range of applications regarding their exceptional structural and specific mechanical properties, such as adjustable permeability, high surface area, and high specific strength. To enhance the compressive strength of porous alumina further, core-shell structures with a dense core and porous shell were produced by combining co-extrusion and robocasting. Different amounts of spherical cellulose particles were added to the paste and subsequently burned out from the printed green bodies to obtain porous alumina. This leads to a porosity ranging from 18 % to 55 % in the samples, whereas the dense alumina shows a porosity of ∼2 %. Two different core-shell ratios were realized to investigate the influence of the dense core on the properties. The core-shell samples were characterized in terms of their porosity using the rule of mixture. The compressive strength of the fabricated structures was investigated and compared to the theoretical strength of porous samples without a dense core. The theoretical strength of porous reference samples was calculated using an empirical exponential expression. A novel approach to structurally reinforce highly porous ceramics was demonstrated by incorporating the dense core. With a porosity of 20 %, the core-shell structures have an average compressive strength of ∼850 MPa. The macrostructure and microstructure of the core-shell samples were investigated using SEM and µCT imaging. This leads to a lower failure of the structure under mechanical load and thus extends the range of possible applications.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"23 ","pages":"Article 100805"},"PeriodicalIF":2.9,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144288965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}