Pub Date : 2025-01-28DOI: 10.1016/j.jeurceramsoc.2025.117245
Mia Kovač , Erin Koos , Bart Van Meerbeek , Jozef Vleugels , Annabel Braem
Direct ink writing (DIW) has emerged as a promising technique for fabricating dense ceramic components, focusing on yttria-stabilised tetragonal zirconia polycrystal (Y-TZP). However, the application of DIW to ceria-stabilised zirconia (Ce-TZP) remains relatively unexplored. A critical factor in achieving dense, defect-free ceramic prints is the formulation of inks that balance optimal rheological properties with high solid loadings. This study investigates the influence of dispersion and mixing protocols on ink rheology and printing parameters, ultimately correlating these factors with the mechanical properties of the sintered components. Pre-milling the ceramic powder with a dispersant before hydrogel addition allowed producing highly homogeneous inks with minimal agglomeration, leading to consistent printing and high-density parts. The maximum achievable solid loading for these Ce-TZP inks, utilising 0.5 wt% Dolapix dispersant within a 25 wt% Pluronic F-127 solution, was 40 vol%. Notably, the mechanical properties of these DIW-produced components were comparable to those of conventionally processed ceramics.
{"title":"Optimisation of ink preparation for direct ink writing of defect-free, high-density Ce-TZP ceramics","authors":"Mia Kovač , Erin Koos , Bart Van Meerbeek , Jozef Vleugels , Annabel Braem","doi":"10.1016/j.jeurceramsoc.2025.117245","DOIUrl":"10.1016/j.jeurceramsoc.2025.117245","url":null,"abstract":"<div><div>Direct ink writing (DIW) has emerged as a promising technique for fabricating dense ceramic components, focusing on yttria-stabilised tetragonal zirconia polycrystal (Y-TZP). However, the application of DIW to ceria-stabilised zirconia (Ce-TZP) remains relatively unexplored. A critical factor in achieving dense, defect-free ceramic prints is the formulation of inks that balance optimal rheological properties with high solid loadings. This study investigates the influence of dispersion and mixing protocols on ink rheology and printing parameters, ultimately correlating these factors with the mechanical properties of the sintered components. Pre-milling the ceramic powder with a dispersant before hydrogel addition allowed producing highly homogeneous inks with minimal agglomeration, leading to consistent printing and high-density parts. The maximum achievable solid loading for these Ce-TZP inks, utilising 0.5 wt% Dolapix dispersant within a 25 wt% Pluronic F-127 solution, was 40 vol%. Notably, the mechanical properties of these DIW-produced components were comparable to those of conventionally processed ceramics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117245"},"PeriodicalIF":5.8,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172958","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 : 2025-01-28DOI: 10.1016/j.jeurceramsoc.2025.117238
Peng-yu Wang , Xiao-ming Chen , Yu-ding Xu , Hao-ran Lei , Xu-mei Zhao , Qing-long Fang , Peng Shi , Han-li Lian , Peng Liu
Dense lead-free ceramics Bi0.5Na0.5Ti0.98Nb0.02O3+δ were successfully prepared using a conventional solid-state sintering method. The effect of light irradiation on dielectric and ferroelectric properties of the ceramics was investigated systematically. Under the light irradiation, dielectric constant increases significantly in the frequency range between 20 Hz and 1 MHz, while the dielectric loss remains nearly unchanged, exhibiting obvious unconventional photo-dielectric effect. As the light was switched on and off periodically, dielectric constant exhibits periodic variation, and the increased magnitude of dielectric constant is positively correlated with light intensity and light wavelength. The light irradiation caused decrease in coercive field and slight increase in polarization. The band structure was analyzed via density functional theory. The mechanism for the unconventional photo-dielectric effect of the ceramics was also discussed. The study provides a guidance for regulating dielectric properties of lead-free ferroelectric ceramics by using light.
{"title":"Unconventional photo-dielectric effect of Bi0.5Na0.5Ti0.98Nb0.02O3+δ lead-free ceramics: Enhanced dielectric constant with unchanged dielectric loss and low photoconductivity by light irradiation","authors":"Peng-yu Wang , Xiao-ming Chen , Yu-ding Xu , Hao-ran Lei , Xu-mei Zhao , Qing-long Fang , Peng Shi , Han-li Lian , Peng Liu","doi":"10.1016/j.jeurceramsoc.2025.117238","DOIUrl":"10.1016/j.jeurceramsoc.2025.117238","url":null,"abstract":"<div><div>Dense lead-free ceramics Bi<sub>0.5</sub>Na<sub>0.5</sub>Ti<sub>0.98</sub>Nb<sub>0.02</sub>O<sub>3+δ</sub> were successfully prepared using a conventional solid-state sintering method. The effect of light irradiation on dielectric and ferroelectric properties of the ceramics was investigated systematically. Under the light irradiation, dielectric constant increases significantly in the frequency range between 20 Hz and 1 MHz, while the dielectric loss remains nearly unchanged, exhibiting obvious unconventional photo-dielectric effect. As the light was switched on and off periodically, dielectric constant exhibits periodic variation, and the increased magnitude of dielectric constant is positively correlated with light intensity and light wavelength. The light irradiation caused decrease in coercive field and slight increase in polarization. The band structure was analyzed via density functional theory. The mechanism for the unconventional photo-dielectric effect of the ceramics was also discussed. The study provides a guidance for regulating dielectric properties of lead-free ferroelectric ceramics by using light.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117238"},"PeriodicalIF":5.8,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171912","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 : 2025-01-27DOI: 10.1016/j.jeurceramsoc.2025.117240
Diyan Yang , Xiaojun Wu , Xiang Lv , Jiagang Wu
Bi0.5Na0.5TiO3-based ceramics are a promising lead-free alternative to lead-based counterparts due to large electro-strain. However, high driving electric fields required to trigger the giant strain hinder practical applications. Constructing 2–2 relaxor/ferroelectric composites is an effective and process-simplified method to decrease the driving field. Herein, flat and dense BNKT-0.01Ta/xBNKT 2–2 composite ceramics are fabricated by the solid state reaction, and the variations of driving field and electro-strain with the addition of BNKT layer are investigated systematically. The optimal performance (i.e., high electro-strain & low driving field) is obtained when x = 10 wt%. Under a low electric field of 40 kV/cm, a relatively high electro-strain (∼0.33 %) and a large d33* (Smax/Emax=843 pm/V) are obtained. Moreover, the electro-strain of composites shows benign temperature stability within 25–105 ℃. Our work not only provides a simple and efficient method for fabricating 2–2 relaxor/ferroelectric composites but also gives formulations that enable large electro-strain under low driving fields.
{"title":"Low driving field and large strain in Bi0.5Na0.5TiO3-based relaxor/ferroelectric composite ceramics","authors":"Diyan Yang , Xiaojun Wu , Xiang Lv , Jiagang Wu","doi":"10.1016/j.jeurceramsoc.2025.117240","DOIUrl":"10.1016/j.jeurceramsoc.2025.117240","url":null,"abstract":"<div><div>Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-based ceramics are a promising lead-free alternative to lead-based counterparts due to large electro-strain. However, high driving electric fields required to trigger the giant strain hinder practical applications. Constructing 2–2 relaxor/ferroelectric composites is an effective and process-simplified method to decrease the driving field. Herein, flat and dense BNKT-0.01Ta/<em>x</em>BNKT 2–2 composite ceramics are fabricated by the solid state reaction, and the variations of driving field and electro-strain with the addition of BNKT layer are investigated systematically. The optimal performance (i.e., high electro-strain & low driving field) is obtained when <em>x</em> = 10 <em>wt</em>%. Under a low electric field of 40 kV/cm, a relatively high electro-strain (∼0.33 %) and a large <em>d</em><sub>33</sub>* (<em>S</em><sub>max</sub>/<em>E</em><sub>max</sub>=843 pm/V) are obtained. Moreover, the electro-strain of composites shows benign temperature stability within 25–105 ℃. Our work not only provides a simple and efficient method for fabricating 2–2 relaxor/ferroelectric composites but also gives formulations that enable large electro-strain under low driving fields.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117240"},"PeriodicalIF":5.8,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171910","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}
Porous TiC is a representative of porous ceramic showing poor mechanical properties owing to high fabricate temperature. It has attracted increasing attention to fabricate porous TiC with high mechanical strength and 3D porous structure. Here, we introduce an effective way for fabricating porous TiC via template method in which phenolic resin derived carbon reacts with Ti powders to form TiC. Since the porosity and pore structure play important roles in mechanical performance, in this work the porosity of TiC was controlled by template content of NaCl. For investing the formation process of TiC, green body of phenolic resin-Ti was carried out on TG-DSC and DRIFTS. It was revealed that the formation of TiC occurred in two stages, each governed by phenolic resin carbonization, and TiC was formed above 700 ℃. The as-prepared porous TiC possessed unique 3D porous structure and excellent mechanical performance. With the increase of NaCl content, the porosity of TiC increased, but the pore size distribution became narrower. By taking advantage of pore structure, porous TiC showed high compressive strength. Compressive strength together with bulk density gradually decreased with the porosity increase. When the porosity increased from 30.1 % to 55.1 %, the compressive strength decreased from 177.2 MPa to 58.7 MPa. Moreover, the 3D architecture render TiC excellent thermal insulation performance, as the porosity was decreased, the thermal conductivity of porous TiC decreases from 3.5 W/m.K to 1.9 W/m.K.
{"title":"Characterization of stiff porous TiC fabricated by in-situ reaction of Ti with carbon derived from phenolic resin containing template","authors":"Diqiang Liu , Hongqiang Zhang , Weiqi Zhao , Guangkun Chen , Aihong Cui , Shujun Zang , Jiangang Jia , Tieming Guo","doi":"10.1016/j.jeurceramsoc.2025.117241","DOIUrl":"10.1016/j.jeurceramsoc.2025.117241","url":null,"abstract":"<div><div>Porous TiC is a representative of porous ceramic showing poor mechanical properties owing to high fabricate temperature. It has attracted increasing attention to fabricate porous TiC with high mechanical strength and 3D porous structure. Here, we introduce an effective way for fabricating porous TiC via template method in which phenolic resin derived carbon reacts with Ti powders to form TiC. Since the porosity and pore structure play important roles in mechanical performance, in this work the porosity of TiC was controlled by template content of NaCl. For investing the formation process of TiC, green body of phenolic resin-Ti was carried out on TG-DSC and DRIFTS. It was revealed that the formation of TiC occurred in two stages, each governed by phenolic resin carbonization, and TiC was formed above 700 ℃. The as-prepared porous TiC possessed unique 3D porous structure and excellent mechanical performance. With the increase of NaCl content, the porosity of TiC increased, but the pore size distribution became narrower. By taking advantage of pore structure, porous TiC showed high compressive strength. Compressive strength together with bulk density gradually decreased with the porosity increase. When the porosity increased from 30.1 % to 55.1 %, the compressive strength decreased from 177.2 MPa to 58.7 MPa. Moreover, the 3D architecture render TiC excellent thermal insulation performance, as the porosity was decreased, the thermal conductivity of porous TiC decreases from 3.5 W/m.K to 1.9 W/m.K.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117241"},"PeriodicalIF":5.8,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171914","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 : 2025-01-27DOI: 10.1016/j.jeurceramsoc.2025.117237
Martina Fracchia , Mauro Coduri , Simone Bonati , Catherine Dejoie , Paolo Ghigna , Umberto Anselmi-Tamburini
High entropy oxides are a novel class of materials, where multiple cations can be incorporated in a single-phase structure. Since the discovery of the prototypical compound Co0.2Cu0.2Mg0.2Ni0.2Zn0.2O, the research on these materials has shown an impressive boost. This compound adopts a rock-salt structure, even if CuO and ZnO are usually stable as tenorite and wurtzite. The attainment of a single phase is usually ascribed to the substantial value of configurational entropy that counterbalances unfavourable enthalpy terms. Here, we reconsider the effective role of configurational entropy in the stabilization in view of the solubility and redox equilibria involved. A careful examination of the high-temperature solubility limit of CuO in each native rock salt oxide proves to be useful to predict the phase stability. However, when the number of components is high, the behaviour becomes, at least to some extent, distinct from that of the constituent rock-salt oxides and difficult to predict.
{"title":"Beyond configurational entropy: the role of solubility equilibria in the stability of the system (Co,Cu,Mg,Ni,Zn)O","authors":"Martina Fracchia , Mauro Coduri , Simone Bonati , Catherine Dejoie , Paolo Ghigna , Umberto Anselmi-Tamburini","doi":"10.1016/j.jeurceramsoc.2025.117237","DOIUrl":"10.1016/j.jeurceramsoc.2025.117237","url":null,"abstract":"<div><div>High entropy oxides are a novel class of materials, where multiple cations can be incorporated in a single-phase structure. Since the discovery of the prototypical compound Co<sub>0.2</sub>Cu<sub>0.2</sub>Mg<sub>0.2</sub>Ni<sub>0.2</sub>Zn<sub>0.2</sub>O, the research on these materials has shown an impressive boost. This compound adopts a rock-salt structure, even if CuO and ZnO are usually stable as tenorite and wurtzite. The attainment of a single phase is usually ascribed to the substantial value of configurational entropy that counterbalances unfavourable enthalpy terms. Here, we reconsider the effective role of configurational entropy in the stabilization in view of the solubility and redox equilibria involved. A careful examination of the high-temperature solubility limit of CuO in each native rock salt oxide proves to be useful to predict the phase stability. However, when the number of components is high, the behaviour becomes, at least to some extent, distinct from that of the constituent rock-salt oxides and difficult to predict.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117237"},"PeriodicalIF":5.8,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-26DOI: 10.1016/j.jeurceramsoc.2025.117239
Yule Yang , Leiyang Zhang , Ruiyi Jing , Wenjing Shi , Fukang Chen , Yan Yan , Denis Alikin , Vladimir Shur , Li Jin
Due to their high dielectric and polarization response, relaxor ferroelectric (RFE) ceramics have been extensively studied as matrices for dielectric energy-storage (ES) materials. However, poor dielectric bias-field stability presents a significant bottleneck for their application and further enhancement of ES performance. Here, we propose a novel approach to address this issue. By employing a mesoscale stacked structure design, we integrate RFE and relaxor antiferroelectric (RAFE) materials to create multilayer composite ceramics that optimize dielectric properties. Specifically, we utilize 0.5(Bi0.5Na0.4K0.1)TiO3-0.5[2/3SrTiO3-1/3Bi(Mg1/3Nb2/3)O3] as the RFE matrix and (Pb0.95La0.02Sr0.02)(Zr0.5Sn0.4Ti0.1)O3 as the RAFE matrix. This combination achieves a stable dielectric permittivity of approximately 900 across an electric field range of ± 150 kV/cm, with fluctuations under ± 15 %. The composite also exhibits remarkable ES performance, with a recoverable ES density of 6.14 J/cm3 and efficiency of 86.7 % under 430 kV/cm. Our findings offer a reliable solution for multilayer ceramic capacitors and advance dielectric materials in high-voltage applications.
{"title":"RFE/RAFE multilayer composite ceramics with excellent dielectric bias-field stability","authors":"Yule Yang , Leiyang Zhang , Ruiyi Jing , Wenjing Shi , Fukang Chen , Yan Yan , Denis Alikin , Vladimir Shur , Li Jin","doi":"10.1016/j.jeurceramsoc.2025.117239","DOIUrl":"10.1016/j.jeurceramsoc.2025.117239","url":null,"abstract":"<div><div>Due to their high dielectric and polarization response, relaxor ferroelectric (RFE) ceramics have been extensively studied as matrices for dielectric energy-storage (ES) materials. However, poor dielectric bias-field stability presents a significant bottleneck for their application and further enhancement of ES performance. Here, we propose a novel approach to address this issue. By employing a mesoscale stacked structure design, we integrate RFE and relaxor antiferroelectric (RAFE) materials to create multilayer composite ceramics that optimize dielectric properties. Specifically, we utilize 0.5(Bi<sub>0.5</sub>Na<sub>0.4</sub>K<sub>0.1</sub>)TiO<sub>3</sub>-0.5[2/3SrTiO<sub>3</sub>-1/3Bi(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>] as the RFE matrix and (Pb<sub>0.95</sub>La<sub>0.02</sub>Sr<sub>0.02</sub>)(Zr<sub>0.5</sub>Sn<sub>0.4</sub>Ti<sub>0.1</sub>)O<sub>3</sub> as the RAFE matrix. This combination achieves a stable dielectric permittivity of approximately 900 across an electric field range of ± 150 kV/cm, with fluctuations under ± 15 %. The composite also exhibits remarkable ES performance, with a recoverable ES density of 6.14 J/cm<sup>3</sup> and efficiency of 86.7 % under 430 kV/cm. Our findings offer a reliable solution for multilayer ceramic capacitors and advance dielectric materials in high-voltage applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117239"},"PeriodicalIF":5.8,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171917","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 : 2025-01-25DOI: 10.1016/j.jeurceramsoc.2025.117236
N. Garcia-de-Albeniz , M.-P. Ginebra , E. Jiménez-Piqué , C. Mas-Moruno
Surface topography at the nanoscale plays a crucial role in modulating the biological properties of dental implants. However, the understanding of how the nanoroughness of zirconia affects cell and bacteria responses remains unclear. In this study, chemical etching of 3Y-TZP was explored to develop a nanotopography capable of favoring eukaryotic cell behavior while simultaneously inhibiting bacterial adhesion. Three topographies of different roughness were created by varying the etching time with hydrofluoric acid (i.e., HF15, HF30, and HF60). The etched surfaces exhibited a nanorough topography with randomly distributed nanopits, and surface roughness increased at longer etching times. Mesenchymal stem cell adhesion, spreading, proliferation and mineralization were enhanced on the etched surfaces, compared to flat controls. The roughest surface (HF60) also inhibited S. aureus adhesion and caused significant damage to P. aeruginosa. This study highlights the potential of chemical etching to produce nanorough zirconia with improved biological outcomes.
{"title":"Chemical etching-induced nanoroughness enhances cell response and antibacterial activity on zirconia","authors":"N. Garcia-de-Albeniz , M.-P. Ginebra , E. Jiménez-Piqué , C. Mas-Moruno","doi":"10.1016/j.jeurceramsoc.2025.117236","DOIUrl":"10.1016/j.jeurceramsoc.2025.117236","url":null,"abstract":"<div><div>Surface topography at the nanoscale plays a crucial role in modulating the biological properties of dental implants. However, the understanding of how the nanoroughness of zirconia affects cell and bacteria responses remains unclear. In this study, chemical etching of 3Y-TZP was explored to develop a nanotopography capable of favoring eukaryotic cell behavior while simultaneously inhibiting bacterial adhesion. Three topographies of different roughness were created by varying the etching time with hydrofluoric acid (i.e., HF15, HF30, and HF60). The etched surfaces exhibited a nanorough topography with randomly distributed nanopits, and surface roughness increased at longer etching times. Mesenchymal stem cell adhesion, spreading, proliferation and mineralization were enhanced on the etched surfaces, compared to flat controls. The roughest surface (HF60) also inhibited <em>S. aureus</em> adhesion and caused significant damage to <em>P. aeruginosa</em>. This study highlights the potential of chemical etching to produce nanorough zirconia with improved biological outcomes.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117236"},"PeriodicalIF":5.8,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171918","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 : 2025-01-25DOI: 10.1016/j.jeurceramsoc.2025.117235
Moritz Hoffmann , Nils Hendrik Schubert , Jens Günster , Bogna Stawarczyk , Andrea Zocca
This study is dedicated to the additive manufacturing of a feldspar glass-ceramic for dental applications by LSD-print (layerwise slurry deposition) technology, a variation of binder jetting using water-based ceramic slurries as feedstock. This technology was investigated for the manufacturing of single tooth restoration demonstrators with good aesthetic properties, and to compare the additively manufactured material with a commercial reference. Model restorations with > 99 % relative density were processed with a debinding and firing cycle of 45 min, however the whole process chain accounts for up to 30 hours. Significant differences between LSD-printed and reference materials were found for fracture strength, fracture toughness and Martens parameters. Printing orientation affected shrinkage and fracture strength, but not fracture toughness and Martens parameters. Nevertheless, the results suggest that the LSD-print technology processing the developed slurry is a promising option for manufacturing dental restorations meeting class 1a requirements according to DIN EN ISO 6871:2019–01.
{"title":"Additive manufacturing of glass-ceramic dental restorations by layerwise slurry deposition (LSD-print)","authors":"Moritz Hoffmann , Nils Hendrik Schubert , Jens Günster , Bogna Stawarczyk , Andrea Zocca","doi":"10.1016/j.jeurceramsoc.2025.117235","DOIUrl":"10.1016/j.jeurceramsoc.2025.117235","url":null,"abstract":"<div><div>This study is dedicated to the additive manufacturing of a feldspar glass-ceramic for dental applications by LSD-print (layerwise slurry deposition) technology, a variation of binder jetting using water-based ceramic slurries as feedstock. This technology was investigated for the manufacturing of single tooth restoration demonstrators with good aesthetic properties, and to compare the additively manufactured material with a commercial reference. Model restorations with > 99 % relative density were processed with a debinding and firing cycle of 45 min, however the whole process chain accounts for up to 30 hours. Significant differences between LSD-printed and reference materials were found for fracture strength, fracture toughness and Martens parameters. Printing orientation affected shrinkage and fracture strength, but not fracture toughness and Martens parameters. Nevertheless, the results suggest that the LSD-print technology processing the developed slurry is a promising option for manufacturing dental restorations meeting class 1a requirements according to DIN EN ISO 6871:2019–01.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117235"},"PeriodicalIF":5.8,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-24DOI: 10.1016/j.jeurceramsoc.2025.117234
Ning Qian , Bo Sun , Min Li , Jiali Wang , Lihe Yang , Raj Das , Wenfeng Ding , Jiuhua Xu
This paper investigates the damage mechanisms of 3D needled C/SiC composites through finite element method analysis and orthogonal turning experiments using polycrystalline diamond (PCD) tools. The results show that material can be removed in a fragmented manner due to its brittleness. The SiC ceramic matrix fractures earlier than the carbon fibers, leading to cracks along the fiber-reinforcement direction and machining surface defects that are primarily characterized by matrix cracking, fiber fracture, fiber pull-out, and microcracks. Chips resulting from the fracture of carbon fiber bundles are typically elongated and flat, whereas those containing SiC ceramic matrix are irregularly block-shaped, with cracks present on their surface. The optimized turning parameters were found to be – a spindle speed of 200 r/min, a feed rate of 0.15 mm/r, and a cutting depth of 0.1 mm, which led to a 50.38 % increase in material removal rate compared to current turning process parameters.
{"title":"Mechanism of cutting damage formation and turning process optimization of 3D needled C/SiC composites","authors":"Ning Qian , Bo Sun , Min Li , Jiali Wang , Lihe Yang , Raj Das , Wenfeng Ding , Jiuhua Xu","doi":"10.1016/j.jeurceramsoc.2025.117234","DOIUrl":"10.1016/j.jeurceramsoc.2025.117234","url":null,"abstract":"<div><div>This paper investigates the damage mechanisms of 3D needled C/SiC composites through finite element method analysis and orthogonal turning experiments using polycrystalline diamond (PCD) tools. The results show that material can be removed in a fragmented manner due to its brittleness. The SiC ceramic matrix fractures earlier than the carbon fibers, leading to cracks along the fiber-reinforcement direction and machining surface defects that are primarily characterized by matrix cracking, fiber fracture, fiber pull-out, and microcracks. Chips resulting from the fracture of carbon fiber bundles are typically elongated and flat, whereas those containing SiC ceramic matrix are irregularly block-shaped, with cracks present on their surface. The optimized turning parameters were found to be – a spindle speed of 200 r/min, a feed rate of 0.15 mm/r, and a cutting depth of 0.1 mm, which led to a 50.38 % increase in material removal rate compared to current turning process parameters.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117234"},"PeriodicalIF":5.8,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172952","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 : 2025-01-21DOI: 10.1016/j.jeurceramsoc.2025.117232
Siyue Song , Tian Wang , Wenxuan Wang , Philippe Sciau , Jianfeng Zhu , Ying Wang , Xiuling Wang , Liangliang Hou , Hongjie Luo , Fen Wang
Inlaid celadon from Hunyuan Kiln is one of the famous varieties of ancient ceramics during Liao, Jin and Yuan Dynasties (916–1368 CE). In this work, the microstructure of inlaid celadon and ordinary celadons was systematically analyzed by imaging and spectroscopic techniques. The results reveal that the inlaid celadon is composed of a four-layer structural glaze, two-layer slips, and body. The slip is integral in creating the white patterns against the green glaze. The transparency and gloss of the glaze are attributed to the presence of K2O and CaO. The X-ray diffraction patterns of samples present no distinct crystalline peaks, corroborating the high quality of the glaze. The relative intensity of XRD 2θ= 20–30° band is inversely related to modifier/network-forming oxides molar ratio, suggesting that increased modifier oxide content enhances disordered structures. Bodies appear gray due to Fe and Ti.
{"title":"Chemical and microstructural study of inlaid celadon from Hunyuan Kiln (Datong City, Shanxi Province, 916–1368 CE) using imaging and spectroscopic techniques","authors":"Siyue Song , Tian Wang , Wenxuan Wang , Philippe Sciau , Jianfeng Zhu , Ying Wang , Xiuling Wang , Liangliang Hou , Hongjie Luo , Fen Wang","doi":"10.1016/j.jeurceramsoc.2025.117232","DOIUrl":"10.1016/j.jeurceramsoc.2025.117232","url":null,"abstract":"<div><div>Inlaid celadon from Hunyuan Kiln is one of the famous varieties of ancient ceramics during Liao, Jin and Yuan Dynasties (916–1368 CE). In this work, the microstructure of inlaid celadon and ordinary celadons was systematically analyzed by imaging and spectroscopic techniques. The results reveal that the inlaid celadon is composed of a four-layer structural glaze, two-layer slips, and body. The slip is integral in creating the white patterns against the green glaze. The transparency and gloss of the glaze are attributed to the presence of K<sub>2</sub>O and CaO. The X-ray diffraction patterns of samples present no distinct crystalline peaks, corroborating the high quality of the glaze. The relative intensity of XRD 2θ= 20–30° band is inversely related to modifier/network-forming oxides molar ratio, suggesting that increased modifier oxide content enhances disordered structures. Bodies appear gray due to Fe and Ti.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117232"},"PeriodicalIF":5.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171895","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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