Journal of The European Ceramic Society最新文献

英文中文

RFE/RAFE multilayer composite ceramics with excellent dielectric bias-field stability

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-26 DOI: 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(Bi_0.5Na_0.4K_0.1)TiO₃-0.5[2/3SrTiO₃-1/3Bi(Mg_1/3Nb_2/3)O₃] as the RFE matrix and (Pb_0.95La_0.02Sr_0.02)(Zr_0.5Sn_0.4Ti_0.1)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}

引用次数: 0

Chemical etching-induced nanoroughness enhances cell response and antibacterial activity on zirconia

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-25 DOI: 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}

引用次数: 0

Additive manufacturing of glass-ceramic dental restorations by layerwise slurry deposition (LSD-print)

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-25 DOI: 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}

引用次数: 0

Mechanism of cutting damage formation and turning process optimization of 3D needled C/SiC composites

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-24 DOI: 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}

引用次数: 0

Chemical and microstructural study of inlaid celadon from Hunyuan Kiln (Datong City, Shanxi Province, 916–1368 CE) using imaging and spectroscopic techniques

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-21 DOI: 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}

引用次数: 0

Sintering mechanisms, phase transformations and microstructure of porcelain stoneware containing thermally inertized man-made vitreous fibres

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-21 DOI: 10.1016/j.jeurceramsoc.2025.117230

Sonia Conte , Riccardo Fantini , Rossella Arletti , Chiara Molinari , Michele Dondi , Chiara Zanelli , Alessandro F. Gualtieri

The waste incorporation into porcelain stoneware is a key strategy for enhancing sustainability in ceramic production. To achieve a satisfactory finished product, a crucial aspect to be investigated is the effect that a waste can induce on the tile sintering behaviour, which, in turn, determines its final technological properties. This study investigates the effect of a glass deriving from the thermal inertization of man‑made vitreous fibres on the sintering of porcelain stoneware tiles, obtained by pressing and fast firing. Results indicated that it is easier to incorporate into porcelain stoneware than other peralkaline glasses, due to its tendency to crystallize in the early stage of the densification process, limiting the interaction with the ceramic matrix and allowing the achievement of a good densification. Otherwise, the microstructure of the fired tiles in overfiring conditions is influenced, since the loss of bulk viscosity and likely the Fe^3 + reduction led to bloating phenomena.

{"title":"Sintering mechanisms, phase transformations and microstructure of porcelain stoneware containing thermally inertized man-made vitreous fibres","authors":"Sonia Conte , Riccardo Fantini , Rossella Arletti , Chiara Molinari , Michele Dondi , Chiara Zanelli , Alessandro F. Gualtieri","doi":"10.1016/j.jeurceramsoc.2025.117230","DOIUrl":"10.1016/j.jeurceramsoc.2025.117230","url":null,"abstract":"<div><div>The waste incorporation into porcelain stoneware is a key strategy for enhancing sustainability in ceramic production. To achieve a satisfactory finished product, a crucial aspect to be investigated is the effect that a waste can induce on the tile sintering behaviour, which, in turn, determines its final technological properties. This study investigates the effect of a glass deriving from the thermal inertization of man‑made vitreous fibres on the sintering of porcelain stoneware tiles, obtained by pressing and fast firing. Results indicated that it is easier to incorporate into porcelain stoneware than other peralkaline glasses, due to its tendency to crystallize in the early stage of the densification process, limiting the interaction with the ceramic matrix and allowing the achievement of a good densification. Otherwise, the microstructure of the fired tiles in overfiring conditions is influenced, since the loss of bulk viscosity and likely the Fe<sup>3 +</sup> reduction led to bloating phenomena.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117230"},"PeriodicalIF":5.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171915","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}

引用次数: 0

Effect of CMAS concentration on the failure mode of Yb2Si2O7-based environmental barrier coatings in water vapor environments

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-21 DOI: 10.1016/j.jeurceramsoc.2025.117233

Shiliang Luan, Ke Ren, Yiguang Wang

A single-phase Yb₂Si₂O₇ coating was deposited on SiC_f/SiC composites with a silicon bond coat using air plasma spraying. The hot corrosion behavior of Yb₂Si₂O₇-coated SiC_f/SiC was investigated in a coupling environment consisting of water vapor and calcium–magnesium–aluminum–silicate (CMAS) with static oxidation at 1350 °C. The evolution of the phase and cross-sectional morphology of the samples was characterized using X-ray diffraction and scanning electron microscopy. The results indicate that thermal stress generated by the growth of the thermally grown oxide (TGO) layer leads to the fractures at the TGO–Yb₂Si₂O₇ interface in samples loaded with low CMAS concentration. In samples with high CMAS concentration, excess CMAS reacts with the TGO layer, destroying its structure and accelerating the oxidation of the Si bond coat. Cracks bifurcate within the TGO layer, extend along the TGO interface, and ultimately penetrate the interior of the TGO layer. The concentration of CMAS influences the crack propagation mode within the TGO layer and alters the failure behavior of the coating.

{"title":"Effect of CMAS concentration on the failure mode of Yb2Si2O7-based environmental barrier coatings in water vapor environments","authors":"Shiliang Luan, Ke Ren, Yiguang Wang","doi":"10.1016/j.jeurceramsoc.2025.117233","DOIUrl":"10.1016/j.jeurceramsoc.2025.117233","url":null,"abstract":"<div><div>A single-phase Yb<sub>2</sub>Si<sub>2</sub>O<sub>7</sub> coating was deposited on SiC<sub>f</sub>/SiC composites with a silicon bond coat using air plasma spraying. The hot corrosion behavior of Yb<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>-coated SiC<sub>f</sub>/SiC was investigated in a coupling environment consisting of water vapor and calcium–magnesium–aluminum–silicate (CMAS) with static oxidation at 1350 °C. The evolution of the phase and cross-sectional morphology of the samples was characterized using X-ray diffraction and scanning electron microscopy. The results indicate that thermal stress generated by the growth of the thermally grown oxide (TGO) layer leads to the fractures at the TGO–Yb<sub>2</sub>Si<sub>2</sub>O<sub>7</sub> interface in samples loaded with low CMAS concentration. In samples with high CMAS concentration, excess CMAS reacts with the TGO layer, destroying its structure and accelerating the oxidation of the Si bond coat. Cracks bifurcate within the TGO layer, extend along the TGO interface, and ultimately penetrate the interior of the TGO layer. The concentration of CMAS influences the crack propagation mode within the TGO layer and alters the failure behavior of the coating.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117233"},"PeriodicalIF":5.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156518","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}

引用次数: 0

Titanium-based brazing alloy for bonding oxide/oxide CMCs for steelmaking industry applications

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-21 DOI: 10.1016/j.jeurceramsoc.2025.117231

Carla Malinverni , Valentina Casalegno , Pierre Bertrand , Georg Puchas , Stefan Schafföner , Milena Salvo

In this work, a Ti-based high-entropy alloy was used to join Al₂O_3f / Al₂O₃-ZrO₂ ceramic matrix composites, intended for use as radiant tube furnace components in energy-intensive industries such as steelmaking. The brazing cycle was conducted in a vacuum tubular furnace up to 1050 °C. The brazing material consisted of brazing alloy powders mixed with a water-based binder. Process parameters studied included the weight percentages of the binder, the pressure applied on the joints, and additional heat treatments to obtain successful brazed CMCs. Morphological characterizations were conducted to analyze the brazed joints and the microstructure of the filler metal. Mechanical shear tests at room temperature were performed to assess the apparent shear strength of the brazed joints, measuring 49 ± 8 MPa of apparent shear strength for butt-configuration joints with failure mode caused by the delamination of the composite. Additionally, direct-flame exposure tests were conducted to evaluate the brazed joints in combustion environments.

{"title":"Titanium-based brazing alloy for bonding oxide/oxide CMCs for steelmaking industry applications","authors":"Carla Malinverni , Valentina Casalegno , Pierre Bertrand , Georg Puchas , Stefan Schafföner , Milena Salvo","doi":"10.1016/j.jeurceramsoc.2025.117231","DOIUrl":"10.1016/j.jeurceramsoc.2025.117231","url":null,"abstract":"<div><div>In this work, a Ti-based high-entropy alloy was used to join Al<sub>2</sub>O<sub>3<em>f</em></sub> / Al<sub>2</sub>O<sub>3</sub>-ZrO<sub>2</sub> ceramic matrix composites, intended for use as radiant tube furnace components in energy-intensive industries such as steelmaking. The brazing cycle was conducted in a vacuum tubular furnace up to 1050 °C. The brazing material consisted of brazing alloy powders mixed with a water-based binder. Process parameters studied included the weight percentages of the binder, the pressure applied on the joints, and additional heat treatments to obtain successful brazed CMCs. Morphological characterizations were conducted to analyze the brazed joints and the microstructure of the filler metal. Mechanical shear tests at room temperature were performed to assess the apparent shear strength of the brazed joints, measuring 49 ± 8 MPa of apparent shear strength for butt-configuration joints with failure mode caused by the delamination of the composite. Additionally, direct-flame exposure tests were conducted to evaluate the brazed joints in combustion environments.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117231"},"PeriodicalIF":5.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172953","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}

引用次数: 0

Fused Filament Fabrication of silicon carbide parts: A strategy for producing high-strength components

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-21 DOI: 10.1016/j.jeurceramsoc.2025.117229

Maëlys Gauthé , Christophe Lorrette , Laurent Chaffron , Sarah Calmé , Xavier Tonnellier , Jacques Rodolfo , Yvan Sortais

Fused Filament Fabrication (FFF) is a constant evolving additive manufacturing (AM) technology enabling the production of near-net-shape parts with complex geometries without requiring molds. While extensively applied to oxide ceramics such as alumina and zirconia, its application to non-oxide ceramics like silicon carbide (SiC) remains underexplored. Key challenges include defects arising from sintering operations and inherent porosity introduced by the 3D printing process. This original study examines the best strategy to produce fully dense and defect-free SiC through FFF method combined with pressureless sintering. Process parameters were systematically refined using Taguchi’s method. Defects like delaminations and voids were characterized and correlated with filament ageing. By employing optimized parameters, printed parts exhibited fine, homogeneous microstructures along with mechanical performances comparable to commercial SiC grades. The resulting properties include a density of 3.14 g.cm^-³ , a hardness of 2492 HV, a Young’s modulus of 410 GPa, and an average flexural strength of 429 MPa with a Weibull’s modulus of 9.0. Furthermore, this contribution highlights the significant influence of filament ageing on mechanical performance, providing valuable insights for the development of reliable SiC components via FFF.

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引用次数: 0

Thermoelastic properties of polycrystalline strontium titanium silicate Sr₂TiSi₂O₈ synthesized via the reactive sintering method

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-20 DOI: 10.1016/j.jeurceramsoc.2025.117224

Oussama Zwein , Maurice Gonon , Sandra Abdelouhab , Isabella Mastroianni , Marc Duquennoy

The aim of the work presented in this paper is to investigate the thermoelastic properties of polycrystalline Sr-fresnoite Sr₂TiSi₂O₈ (STS). On that purpose, Sr₂TiSi₂O₈ samples were synthesized by solid state reactive sintering from SrCO₃, TiO₂ and SiO₂ powders. The thermal expansion behaviour of the so-obtained material was characterized at the microscale by using High Temperature X-Ray Diffraction (HT – XRD) to follow the changes in the unit cell parameters of STS. The results were correlated to the macroscopic expansion behaviour characterized by dilatometry, and to the evolution of the Young’s modulus with temperature measured by the impulse excitation technique (IET). It is evidenced that STS presents a commensurate-to-incommensurate phase transformation characterized by thermal hysteresis and leading to a minimum peak in CTE at 200 °C during the heating and at 150 °C during the cooling. From 300 °C to 900 °C, the thermal expansion exhibits an almost linear behaviour with an average CTE of

12 \times 10^{- 6} K^{- 1}

. Between 900°C and 1000 °C, a maximum peak in CTE, also characterized by thermal hysteresis, is observed and seems to be attributed to a reverse transformation to a commensurate phase. The value of Young’s modulus E is 105 ± 0.5 GPa at room temperature. The commensurate-to-incommensurate phase transformation also affects the Young’s modulus by inducing a weak minimum peak at the same temperatures as those observed for the CTE. At higher temperature, the Young’s modulus remains stable up to 500 °C and slowly decreases over this temperature. It remains equal to 96 ± 0.5 GPa at 950 °C.

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