Nowadays, concepts such as recycling, reusing, and sustainability are gaining ground in a wide range of fields and sectors, including manufacturing. This paradigm shift from “produce-dispose” to “produce-reuse” is pushing manufacturers and producers to move from a linear economy to a circular one. This change in perspective seems more readily applicable to the world of additive manufacturing, as it offers the potential not only to reduce waste generation, but also to reintroduce discarded and recycled materials into the production chain. This implementation of a circular manufacturing approach could be applied to ceramic additive manufacturing. Is it a straightforward process to implement a circular solution into the production chain? Which are the implications for costs, energy requirements, emissions, and waste management? This open discussion aims to identify potential starting points and gaps for further evaluation of future application of circular economy concepts in the ceramic industry.
{"title":"Exploring circularity in ceramic 3D printing: Possibilities and implementation","authors":"Matilde Aronne , Eric Schwarzer-Fischer , Valentina Bertana , Giulia Mossotti , Uwe Scheithauer , Sergio Ferrero , Luciano Scaltrito","doi":"10.1016/j.oceram.2026.100915","DOIUrl":"10.1016/j.oceram.2026.100915","url":null,"abstract":"<div><div>Nowadays, concepts such as recycling, reusing, and sustainability are gaining ground in a wide range of fields and sectors, including manufacturing. This paradigm shift from “produce-dispose” to “produce-reuse” is pushing manufacturers and producers to move from a linear economy to a circular one. This change in perspective seems more readily applicable to the world of additive manufacturing, as it offers the potential not only to reduce waste generation, but also to reintroduce discarded and recycled materials into the production chain. This implementation of a circular manufacturing approach could be applied to ceramic additive manufacturing. Is it a straightforward process to implement a circular solution into the production chain? Which are the implications for costs, energy requirements, emissions, and waste management? This open discussion aims to identify potential starting points and gaps for further evaluation of future application of circular economy concepts in the ceramic industry.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100915"},"PeriodicalIF":2.8,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076841","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}
Pub Date : 2026-01-24DOI: 10.1016/j.oceram.2026.100914
Tim Opatz , Maximilian Staudacher , Maximilian Munz , Tanja Lube , Steffen Ihlenfeldt
Reliable lifetime prediction of ceramic components requires fracture toughness measurements supported by sharp, reproducible artificial defects. Conventional notching techniques often lack consistency, are time-consuming, and are particularly limited for fine-grained ceramics and geometrically complex specimens. This study investigates a modified femtosecond-laser vaporization approach that targets an ablation area rather than a single line. To efficiently explore the complex, material-dependent parameter space, Bayesian optimization was employed for zirconia and both conventionally and additively manufactured alumina. The method rapidly identified suitable parameters for zirconia, achieving sharp, smooth notches within only a few experimental iterations. In contrast, alumina exhibited unsuitable fracture behavior, with failure initiating at notch flanks rather than roots. Overall, laser notching demonstrated clear advantages in speed, reproducibility and geometric flexibility, including applicability to complex designs such as the CharAM specimen. Further research is required to ensure consistent root-initiated fracture and to expand understanding across a wider range of materials.
{"title":"Bayesian optimization of laser-aided fracture toughness specimen preparation","authors":"Tim Opatz , Maximilian Staudacher , Maximilian Munz , Tanja Lube , Steffen Ihlenfeldt","doi":"10.1016/j.oceram.2026.100914","DOIUrl":"10.1016/j.oceram.2026.100914","url":null,"abstract":"<div><div>Reliable lifetime prediction of ceramic components requires fracture toughness measurements supported by sharp, reproducible artificial defects. Conventional notching techniques often lack consistency, are time-consuming, and are particularly limited for fine-grained ceramics and geometrically complex specimens. This study investigates a modified femtosecond-laser vaporization approach that targets an ablation area rather than a single line. To efficiently explore the complex, material-dependent parameter space, Bayesian optimization was employed for zirconia and both conventionally and additively manufactured alumina. The method rapidly identified suitable parameters for zirconia, achieving sharp, smooth notches within only a few experimental iterations. In contrast, alumina exhibited unsuitable fracture behavior, with failure initiating at notch flanks rather than roots. Overall, laser notching demonstrated clear advantages in speed, reproducibility and geometric flexibility, including applicability to complex designs such as the CharAM specimen. Further research is required to ensure consistent root-initiated fracture and to expand understanding across a wider range of materials.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100914"},"PeriodicalIF":2.8,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076842","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}
Pub Date : 2026-01-18DOI: 10.1016/j.oceram.2026.100913
Pedr Charlesworth, Robert A. House, Peixi Cong, Robert S. Weatherup, David E.J. Armstrong, Chris Grovenor
Octalithium ceramics (Li8MO6, M = Zr, Pb, Ce, Sn) are highly lithium dense compounds that have been modelled to offer significantly higher tritium breeding ratios (TBRs) compared to the current candidate breeder materials [1]. This investigation demonstrates and investigates a solid-state synthesis route and the importance of atmosphere for the formation of phase pure ceramics of all four compounds. All tested octalithium compounds showed higher coefficients of lattice thermal expansion (CTEs) from 25 - 900°C compared to Li2TiO3 [2], and the measured melting points were Li8SnO6 1238 ±7°C, Li8CeO6 1112 ±6°C, Li8PbO6 1011 ±3°C and Li8ZrO6 1266 ±5°C. The compounds all formed Li2CO3 after long air exposures and Li8SnO6, Li8PbO6 and Li8ZrO6 also produced lower lithium stoichiometry phases (Li2SnO3, Li4PbO4, Li2PbO3 and Li6Zr2O7). Li8CeO6 displayed no crystalline impurities after 20 hours but after one month had decomposed wholly to Li2CO3, CeO2 and Li2O.
{"title":"Investigating the synthesis, reaction pathways, melting points and air sensitivity of Octalithium ceramics, Li8MO6, with M = Sn, Zr, Pb, and Ce","authors":"Pedr Charlesworth, Robert A. House, Peixi Cong, Robert S. Weatherup, David E.J. Armstrong, Chris Grovenor","doi":"10.1016/j.oceram.2026.100913","DOIUrl":"10.1016/j.oceram.2026.100913","url":null,"abstract":"<div><div>Octalithium ceramics (Li<sub>8</sub>MO<sub>6</sub>, M = Zr, Pb, Ce, Sn) are highly lithium dense compounds that have been modelled to offer significantly higher tritium breeding ratios (TBRs) compared to the current candidate breeder materials [<span><span>1</span></span>]. This investigation demonstrates and investigates a solid-state synthesis route and the importance of atmosphere for the formation of phase pure ceramics of all four compounds. All tested octalithium compounds showed higher coefficients of lattice thermal expansion (CTEs) from 25 - 900°C compared to Li<sub>2</sub>TiO<sub>3</sub> [<span><span>2</span></span>], and the measured melting points were Li<sub>8</sub>SnO<sub>6</sub> 1238 <em>±</em>7°C, Li<sub>8</sub>CeO<sub>6</sub> 1112 <em>±</em>6°C, Li<sub>8</sub>PbO<sub>6</sub> 1011 <em>±</em>3°C and Li<sub>8</sub>ZrO<sub>6</sub> 1266 <em>±</em>5°C. The compounds all formed Li<sub>2</sub>CO<sub>3</sub> after long air exposures and Li<sub>8</sub>SnO<sub>6</sub>, Li<sub>8</sub>PbO<sub>6</sub> and Li<sub>8</sub>ZrO<sub>6</sub> also produced lower lithium stoichiometry phases (Li<sub>2</sub>SnO<sub>3</sub>, Li<sub>4</sub>PbO<sub>4</sub>, Li<sub>2</sub>PbO<sub>3</sub> and Li<sub>6</sub>Zr<sub>2</sub>O<sub>7</sub>). Li<sub>8</sub>CeO<sub>6</sub> displayed no crystalline impurities after 20 hours but after one month had decomposed wholly to Li<sub>2</sub>CO<sub>3</sub>, CeO<sub>2</sub> and Li<sub>2</sub>O.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100913"},"PeriodicalIF":2.8,"publicationDate":"2026-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146022370","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}
Pub Date : 2026-01-17DOI: 10.1016/j.oceram.2026.100911
Monica Ferraris , Aurora Pizzinat , Alessandro Benelli , Stefan Schafföner , Georg Puchas , Kevin Nordengren
Ceramic matrix composites (CMC), particularly oxide fiber-reinforced oxide matrix (ox/ox) composites, offer a viable alternative to traditional materials, due to their high temperature thermo-mechanical stability, intrinsic oxidation resistance and low density compared to metals.
However, a joining material having the same thermo-mechanical behavior and oxidation stability as the ox/ox composites is still an open issue.
In this respect, joining by a preceramic polymer offers a unique option, in principle enabling the fabrication of robust ceramic joints; since the process can be done at lower temperatures in respect to traditional methods such as brazing, it can also be attractive from an energy saving point of view.
This study investigated the use of a polysilazane-based preceramic polymer (Durazane 1800) filled with an increasing amount of alumina particles and 1 wt % chopped alumina fibers to join and coat ox/ox composites. The process was the same for joining and coatings: i.e. curing at 180°C and pyrolysis up to 1200°C in air, followed by microstructural and mechanical characterization on each sample.
Lap-shear tests were done on joined samples at room temperature, at 300°C and at 600°C, in air. Fracture surfaces exhibited cohesive failure, indicating sound adhesion between the joining material and the ox/ox composites. However, residual porosity and incomplete covering of the joined area were identified as a limiting factor affecting the joint strength.
X-ray computer tomography (CT) was used to measure the volume of residual porosity, cracks and lack of coating material after curing and pyrolysis on coated samples.
{"title":"Joining of oxide/oxide composites by a preceramic polymer","authors":"Monica Ferraris , Aurora Pizzinat , Alessandro Benelli , Stefan Schafföner , Georg Puchas , Kevin Nordengren","doi":"10.1016/j.oceram.2026.100911","DOIUrl":"10.1016/j.oceram.2026.100911","url":null,"abstract":"<div><div>Ceramic matrix composites (CMC), particularly oxide fiber-reinforced oxide matrix (ox/ox) composites, offer a viable alternative to traditional materials, due to their high temperature thermo-mechanical stability, intrinsic oxidation resistance and low density compared to metals.</div><div>However, a joining material having <em>the same</em> thermo-mechanical behavior and oxidation stability as the ox/ox composites is still an open issue.</div><div>In this respect, joining by a preceramic polymer offers a unique option, in principle enabling the fabrication of robust ceramic joints; since the process can be done at lower temperatures in respect to traditional methods such as brazing, it can also be attractive from an energy saving point of view.</div><div>This study investigated the use of a polysilazane-based preceramic polymer (Durazane 1800) filled with an increasing amount of alumina particles and 1 wt % chopped alumina fibers to join and coat ox/ox composites. The process was the same for joining and coatings: i.e. curing at 180°C and pyrolysis up to 1200°C in air, followed by microstructural and mechanical characterization on each sample.</div><div>Lap-shear tests were done on joined samples at room temperature, at 300°C and at 600°C, in air. Fracture surfaces exhibited cohesive failure, indicating sound adhesion between the joining material and the ox/ox composites. However, residual porosity and incomplete covering of the joined area were identified as a limiting factor affecting the joint strength.</div><div>X-ray computer tomography (CT) was used to measure the volume of residual porosity, cracks and lack of coating material after curing and pyrolysis on coated samples.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100911"},"PeriodicalIF":2.8,"publicationDate":"2026-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146022307","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}
The study investigates the effect of laser fluence and normalized pulse spacing at two different focal distances of 70 mm and 100 mm on the green femtosecond ablation of Si₃N₄, focusing on removal threshold and the morphology of the ablated craters. As the fluence increases, the ablation depth reaches a plateau. A considerable difference in ablation depth was observed for both focal lengths in the fluence range of 20 to 40 J/cm² compared to values above 40 J/cm². Surface ablation tests with varying normalized pulse spacings were conducted based on the results of the single-point experiments, showing that higher material removal was achieved at greater pulse overlaps when using high laser fluence. However, at low laser fluence, the difference in material removal was less pronounced. Additionally, the surface quality at different laser fluences and pulse spacings was compared, indicating considerably improved quality at higher pulse spacings and lower laser fluences.
{"title":"Investigation of green femtosecond laser ablation of silicon nitride for different laser fluences and pulse spacing","authors":"Esmaeil Ghadiri Zahrani , AmirMohammad Fakharzadeh Jahromi , Bahman Azarhoushang","doi":"10.1016/j.oceram.2026.100909","DOIUrl":"10.1016/j.oceram.2026.100909","url":null,"abstract":"<div><div>The study investigates the effect of laser fluence and normalized pulse spacing at two different focal distances of 70 mm and 100 mm on the green femtosecond ablation of Si₃N₄, focusing on removal threshold and the morphology of the ablated craters. As the fluence increases, the ablation depth reaches a plateau. A considerable difference in ablation depth was observed for both focal lengths in the fluence range of 20 to 40 J/cm² compared to values above 40 J/cm². Surface ablation tests with varying normalized pulse spacings were conducted based on the results of the single-point experiments, showing that higher material removal was achieved at greater pulse overlaps when using high laser fluence. However, at low laser fluence, the difference in material removal was less pronounced. Additionally, the surface quality at different laser fluences and pulse spacings was compared, indicating considerably improved quality at higher pulse spacings and lower laser fluences.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100909"},"PeriodicalIF":2.8,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146022308","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}
The sustainability of the manufacturing industry is becoming an increasingly hot topic, particularly the reintroduction of waste into the production chain. The use of AM of ceramics can reduce waste and enable complex, lightweight designs, however, practical routes to circularity remain underdeveloped. This investigation aims to explore the potential of coupling these additive fabrication techniques with raw materials from alternative sources of ceramics, such as printing wastes and error prints, developing a photocurable ceramic suspension for DLP technology. For resin preparation, a polymeric premix was first prepared by combining a mixture of different acrylate monomers as a photoreactive binder with a non-reactive plasticizing additive. Alumina was recovered from failed green bodies following matrix burning out, parts grinding and sieving of the obtained powder. Subsequent investigations of the powder by SEM imaging and EDX analysis were carried out to verify particle morphology and average dimensions and to identify any contaminants in the recycled material. The suspension viscosity and curing behaviour were measured. Finally, the mechanical characteristics of printed parts, their density, their shrinkage, as well as possible contaminants, were evaluated, in order to understand the impact of the recycling process on material performances and to determine its possible application fields. Tests results provided a practical recycling potential for alumina in DLP, offering viable solutions in facilitating closed-loop CerAM manufacturing.
{"title":"Recyclability of ceramic powder in CerAM vat photopolymerization","authors":"Matilde Aronne , Eric Schwarzer-Fischer , Alberto Ballesio , Nadine Lorenz , Valentina Bertana , Uwe Scheithauer , Sergio Ferrero , Luciano Scaltrito","doi":"10.1016/j.oceram.2026.100908","DOIUrl":"10.1016/j.oceram.2026.100908","url":null,"abstract":"<div><div>The sustainability of the manufacturing industry is becoming an increasingly hot topic, particularly the reintroduction of waste into the production chain. The use of AM of ceramics can reduce waste and enable complex, lightweight designs, however, practical routes to circularity remain underdeveloped. This investigation aims to explore the potential of coupling these additive fabrication techniques with raw materials from alternative sources of ceramics, such as printing wastes and error prints, developing a photocurable ceramic suspension for DLP technology. For resin preparation, a polymeric premix was first prepared by combining a mixture of different acrylate monomers as a photoreactive binder with a non-reactive plasticizing additive. Alumina was recovered from failed green bodies following matrix burning out, parts grinding and sieving of the obtained powder. Subsequent investigations of the powder by SEM imaging and EDX analysis were carried out to verify particle morphology and average dimensions and to identify any contaminants in the recycled material. The suspension viscosity and curing behaviour were measured. Finally, the mechanical characteristics of printed parts, their density, their shrinkage, as well as possible contaminants, were evaluated, in order to understand the impact of the recycling process on material performances and to determine its possible application fields. Tests results provided a practical recycling potential for alumina in DLP, offering viable solutions in facilitating closed-loop CerAM manufacturing.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100908"},"PeriodicalIF":2.8,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145925227","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}
Calcined laterite offers a promising alternative to traditional precursors in geopolymer synthesis. Despite its potential, knowledge regarding the effects of calcination conditions, particularly the heating rate, on its properties remains sparse. This research delved into the impact of different calcination heating rates on laterite and the subsequent geopolymer products by calcining laterite at 600°C for 4 hours, with heating rates ranging from 1.5 to 10°C/min. Analytical techniques including isothermal conduction calorimetry (ICC), setting time determination, XRD, TG/DTA, XF, FTIR, Mössbauer spectroscopy and SEM/EDS were employed to characterize both raw and calcined laterite as well as the resulting geopolymer products.
Key findings indicate that higher heating rates augment the amorphous phase in the precursors, leading to decreased setting times. This reduction is directly associated with heightened reaction activity and increased heat release, as noted from ICC results. Notably, mechanical properties improved at a heating rate of 7.5°C/min, giving a compressive strength of 51 MPa. The mentioned heating rate also resulted in the best porosity and water absorption values of 14 % and 8 %, respectively, suggestive of a more consolidated microstructure. The data ultimately designates 7.5°C/min as the optimal heating rate for crafting geopolymers with superior mechanical and microstructural attributes. Mössbauer spectroscopy revealed details of the iron site geometry and oxidation state, showing an increase in Fe3+ content within the silicoaluminate phases. This effect was slightly more pronounced in samples synthesised with a heating rate of 7.5°C/min.
{"title":"Exploring calcination parameters: Impacts on reaction kinetics, mechanical strength, and microstructural evolution in laterite-derived geopolymers","authors":"Rodrigue Cyriaque Kaze , Özgür Cengiz , Abdolhossein Naghizadeh , Hakan Gungunes , Gisèle Laure Lecomte-Nana , Chaouche Mohend","doi":"10.1016/j.oceram.2025.100907","DOIUrl":"10.1016/j.oceram.2025.100907","url":null,"abstract":"<div><div>Calcined laterite offers a promising alternative to traditional precursors in geopolymer synthesis. Despite its potential, knowledge regarding the effects of calcination conditions, particularly the heating rate, on its properties remains sparse. This research delved into the impact of different calcination heating rates on laterite and the subsequent geopolymer products by calcining laterite at 600°C for 4 hours, with heating rates ranging from 1.5 to 10°C/min. Analytical techniques including isothermal conduction calorimetry (ICC), setting time determination, XRD, TG/DTA, XF, FTIR, Mössbauer spectroscopy and SEM/EDS were employed to characterize both raw and calcined laterite as well as the resulting geopolymer products.</div><div>Key findings indicate that higher heating rates augment the amorphous phase in the precursors, leading to decreased setting times. This reduction is directly associated with heightened reaction activity and increased heat release, as noted from ICC results. Notably, mechanical properties improved at a heating rate of 7.5°C/min, giving a compressive strength of 51 MPa. The mentioned heating rate also resulted in the best porosity and water absorption values of 14 % and 8 %, respectively, suggestive of a more consolidated microstructure. The data ultimately designates 7.5°C/min as the optimal heating rate for crafting geopolymers with superior mechanical and microstructural attributes. Mössbauer spectroscopy revealed details of the iron site geometry and oxidation state, showing an increase in Fe<sup>3+</sup> content within the silicoaluminate phases. This effect was slightly more pronounced in samples synthesised with a heating rate of 7.5°C/min.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100907"},"PeriodicalIF":2.8,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145976250","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}
Controlling pore structure gives ceramic products particular beneficial features such as low thermal conductivity, high chemical and mechanical resistance, or weight reduction. In this study, a novel class of ceramic material was produced with raw mixtures prepared with varying proportions of powdered limestone (1 to 5 wt.%) as a modifier and pore-forming agent on pegmatite and syenite-nepheline-based formulations. The ceramics were characterised using a variety of procedures and analytical techniques after being sintered at 1125 to 1225 °C under a fast-sintering rate of 25 °C/min. The results revealed that, using fast and controlled sintering, the proper addition of limestone into the pegmatite and nepheline syenite-based matrix allowed for the development of controlled porosity (formation of macro and meso‑pores), resulting in a reduced material density (1.9 – 2.1 g/cm3). Moreover, despite their good mechanical properties (flexural strength of 54 – 72 MPa and compressive strength of 70 – 150 MPa), the synthesised ceramics exhibited thermal conductivity performance ranging between 0.4562 and 0.5539 Wm-1K-1. Based on the obtained functional properties, the produced high-strength porous ceramics could act as a potential candidate for thermal building materials applications.
{"title":"Innovative mix design of lightweight porcelainised matrix for building comfort: pore - network and microstructures","authors":"TCHAKOUTEU MBAKOP Theophile , DEUTOU Nemaleu Juvenal Giogetti , YANNE Etienne , LEMOUGNA NINLA Patrick , NZEUKOU N. Aubin , Gisèle Laure LECOMTE-NANA , Uphie CHINJE , Elie KAMSEU","doi":"10.1016/j.oceram.2025.100905","DOIUrl":"10.1016/j.oceram.2025.100905","url":null,"abstract":"<div><div>Controlling pore structure gives ceramic products particular beneficial features such as low thermal conductivity, high chemical and mechanical resistance, or weight reduction. In this study, a novel class of ceramic material was produced with raw mixtures prepared with varying proportions of powdered limestone (1 to 5 wt.%) as a modifier and pore-forming agent on pegmatite and syenite-nepheline-based formulations. The ceramics were characterised using a variety of procedures and analytical techniques after being sintered at 1125 to 1225 °C under a fast-sintering rate of 25 °C/min. The results revealed that, using fast and controlled sintering, the proper addition of limestone into the pegmatite and nepheline syenite-based matrix allowed for the development of controlled porosity (formation of macro and meso‑pores), resulting in a reduced material density (1.9 – 2.1 g/cm<sup>3</sup>). Moreover, despite their good mechanical properties (flexural strength of 54 – 72 MPa and compressive strength of 70 – 150 MPa), the synthesised ceramics exhibited thermal conductivity performance ranging between 0.4562 and 0.5539 Wm<sup>-1</sup>K<sup>-1</sup>. Based on the obtained functional properties, the produced high-strength porous ceramics could act as a potential candidate for thermal building materials applications.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100905"},"PeriodicalIF":2.8,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023051","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}
Pub Date : 2025-12-28DOI: 10.1016/j.oceram.2025.100906
Wasan Alkaron , Tamás Kolonits , Katalin Balázsi , Csaba Balázsi
New eco-friendly fiber composites were developed by electrospinning cellulose acetate (CA) combined with calcium oxide (CaO) derived from thermally treated waste eggshells. CA solutions were prepared at varying concentrations to optimize the ideal concentration for producing smooth, continuous, and beads-free fibers. Various amounts of CaO were then added to assess its impact on fiber structure, crystallinity, and swelling characteristics.
FTIR examinations demonstrated that CaO was effectively integrated without altering the CA structure, however XRD investigations revealed reduction in crystallinity with increasing CaO content. The swelling capacity remarkedly increased to 710% at 4% CaO, attributed to enhanced porosity and hydrophilicity, before showing a slight decline at higher concentrations due to particle aggregation. These results highlight a sustainable method for producing functional CA/CaO composites with tailored properties for promising applications in biomedical and environmental fields. Our further aim is to study the biocompatibility, cytotoxicity and the photocatalytic activity of the prepared composites.
{"title":"Fabrication and characterization of eco-friendly CaO-modified cellulose acetate fibers via electrospinning for potential biomedical applications","authors":"Wasan Alkaron , Tamás Kolonits , Katalin Balázsi , Csaba Balázsi","doi":"10.1016/j.oceram.2025.100906","DOIUrl":"10.1016/j.oceram.2025.100906","url":null,"abstract":"<div><div>New eco-friendly fiber composites were developed by electrospinning cellulose acetate (CA) combined with calcium oxide (CaO) derived from thermally treated waste eggshells. CA solutions were prepared at varying concentrations to optimize the ideal concentration for producing smooth, continuous, and beads-free fibers. Various amounts of CaO were then added to assess its impact on fiber structure, crystallinity, and swelling characteristics.</div><div>FTIR examinations demonstrated that CaO was effectively integrated without altering the CA structure, however XRD investigations revealed reduction in crystallinity with increasing CaO content. The swelling capacity remarkedly increased to 710% at 4% CaO, attributed to enhanced porosity and hydrophilicity, before showing a slight decline at higher concentrations due to particle aggregation. These results highlight a sustainable method for producing functional CA/CaO composites with tailored properties for promising applications in biomedical and environmental fields. Our further aim is to study the biocompatibility, cytotoxicity and the photocatalytic activity of the prepared composites.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100906"},"PeriodicalIF":2.8,"publicationDate":"2025-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145883435","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}
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