Open Ceramics最新文献

{"title":"Electrochemical responses and surface degradation analyses alumina and feldspar dental materials in acidic environments: A comprehensive in vitro study","authors":"Soraya Lakhloufi ,&nbsp;Najoua Labjar ,&nbsp;Houda Labjar ,&nbsp;Abdelouahed Dahrouch ,&nbsp;Souad El Hajjaji","doi":"10.1016/j.oceram.2024.100643","DOIUrl":"10.1016/j.oceram.2024.100643","url":null,"abstract":"<div><p>This in vitro study examines the electrochemical responses and surface degradation of alumina and feldspar dental ceramic materials in acidic environments using cyclic polarization and electrochemical impedance spectroscopy (EIS). Alumina and feldspar demonstrate balanced responses in both Fusayama Artificial Saliva and acidic solutions, indicating effective passivation. SEM/EDX analyses after 168-h immersion reveal significant elemental variations, suggesting complex surface phenomena and chemical reactions leading to oxide layer formation. Alumina exhibits increased Si, O, Al, Na, K, and C counts, while feldspar shows increased Si, O, Al, Na with reduced C and Ca levels, indicating complex reactions. Immersion induces notable elemental composition modifications, with alumina showing remarkable corrosion resistance and feldspar undergoing selective dissolution. This study provides insights into the electrochemical and surface degradation of these materials, emphasizing long-term stability and the need for continuous monitoring of protective layer dynamics in future research on corrosion-resistant dental biomaterials.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100643"},"PeriodicalIF":2.9,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266653952400107X/pdfft?md5=ae48e2c25ed8da97e0a6032b3135ecba&pid=1-s2.0-S266653952400107X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141695173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing the cyan light emission of Ba9Lu2Si6O24:Ce phosphors by crystal-site engineering for full spectrum lighting","authors":"Xinjian He ,&nbsp;Shengjuan Li ,&nbsp;Mingxue Deng ,&nbsp;Yangmin Tang ,&nbsp;Machao Wang ,&nbsp;Cheng Wang ,&nbsp;Zhenzhen Zhou ,&nbsp;Jiang Li ,&nbsp;Jiacheng Wang","doi":"10.1016/j.oceram.2024.100642","DOIUrl":"10.1016/j.oceram.2024.100642","url":null,"abstract":"<div><p>Filling the cyan gap is the key element in achieving full-spectrum illumination using violet chip to excite red, green and blue phosphors. However, designing cyan phosphors suitable for violet light excitation with excellent performance remains challenging. Herein, a novel cyan phosphor Ba₉Lu_2-x-nSi₆O₂₄:xCe (n-BLS:Ce) with multiple crystal sites of Ba²⁺ and Lu³⁺ for Ce³⁺ ions was designed and prepared via crystal-site engineering. The Ce³⁺ ions at Ba²⁺ sites emit ultraviolet light at 385 nm under 325 nm ultraviolet light excitation, and the Ce³⁺ ions at Lu³⁺ sites emit cyan light at 485 nm under 395 nm violet light excitation. The favorable occupation of Ce³⁺ ions at Lu³⁺ sites could be realized by introducing Lu vacancies. Significantly, the cyan light emission intensity of Ba₉Lu_1.4Si₆O₂₄:0.3Ce (n_0.3-BLS:Ce) with Lu vacancies is effectively improved by 47 % compared to Ba₉Lu_1.7Si₆O₂₄:0.3Ce (n₀-BLS:Ce) without Lu vacancies. And the emission intensity at 150 °C retains 96 % of that at room temperature. The color rendering index increases from 87.9 to 94.5 after supplementing Ba₉Lu_2-x-nSi₆O₂₄:xCe cyan phosphor in w-LEDs devices combining commercial red, green, and blue phosphors with a violet chip, indicating its potential practical application in full-spectrum lighting. This work also provides new ideas for the design and development of new and efficient high-quality light-emitting materials.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100642"},"PeriodicalIF":2.9,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524001068/pdfft?md5=ffcbac94ff86010631ff54ae1f64e0b9&pid=1-s2.0-S2666539524001068-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141636734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Controlling surface chemistry in cold sintering to advance battery materials","authors":"Y.C. Lan ,&nbsp;Z.M. Grady ,&nbsp;S. Dursun ,&nbsp;E.D. Gomez ,&nbsp;C.A. Randall","doi":"10.1016/j.oceram.2024.100639","DOIUrl":"10.1016/j.oceram.2024.100639","url":null,"abstract":"<div><p>Cold sintering is a recently introduced densification method that is of interest due to the lower energy used in the process, the ability to densify metastable materials, the ability to integrate materials to develop unique composites, and the ability to synthesis materials that can be more easily recycled. Collectively, these advantages make cold sintering a promising approach for processing of battery components, and co-sintering into all solid-state batteries. To obtain high electrochemical performance with cold sintering, detailed control of the surface chemistry of powders is needed, to avoid or minimize the impact of carbonate formation in grain boundaries, and to limit concentrations of secondary phases that are a result of incongruent dissolution processes. In this paper, we outline the importance of surface chemical reactions of powders in cold sintering, and the mitigating processes that can be adopted to control these reactions and obtain high performance and unique opportunities for Li and Na-oxide secondary batteries. We focus on a series of examples that demonstrate how the control of low temperature densification (cold sintering) can address the environmental sensitivity of many battery materials, and highlight the issues faced and open questions. These examples include cold sintering of air-sensitive solid electrolytes, re-processing of crushed solid electrolytes, surface passivation of air-sensitive active materials for processing in air, and fabrication of solid-solid macroscopic interfaces for solid-state batteries.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100639"},"PeriodicalIF":2.9,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524001032/pdfft?md5=6e4a525be2724c4e45b56f579d0c7846&pid=1-s2.0-S2666539524001032-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141629852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Innovative ceramic pigments from recycled lithium-ion battery cathodes for inkjet applications","authors":"Marta Rodrigo,&nbsp;María Fernanda Gazulla,&nbsp;Eulalia Zumaquero,&nbsp;Jorge González","doi":"10.1016/j.oceram.2024.100638","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100638","url":null,"abstract":"<div><p>The booming of the electric mobility together with the need of storing renewable energies have increased the demand of lithium-ion batteries which will bring about increasing amounts of electronic waste. Besides, the need for alternative sources of certain raw materials considered critical has changed the perception of determined wastes, which are no longer considered residues but sources of raw materials. In this work, the active cathode material present in end-of-life lithium-ion batteries (Ni, Co, and Mn) was used as secondary raw material, after being properly separated, in the synthesis of a cobalt iron nickel manganese chromium black spinel ((Co, Fe, Ni, Mn) (Fe,Cr)₂O₄). The pigment was used in the formulation of a ceramic inkjet ink which was deposited over a single-fired porous tile and porcelain tile. Texture and brightness of the ink were not affected by the use of this waste, thus presenting excellent prospects for the industrial ceramic application.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100638"},"PeriodicalIF":2.9,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524001020/pdfft?md5=ef6e512beb49e27aeb9298db98b07e89&pid=1-s2.0-S2666539524001020-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141595010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of titanium carbide (TiC) using recycled precursor for potential scale-up of low-cost MXene","authors":"M.A. Zaed ,&nbsp;R. Saidur ,&nbsp;K.H. Tan ,&nbsp;Jayesh Cherusseri ,&nbsp;A.K. Pandey ,&nbsp;N. Abdullah ,&nbsp;Nurul Atiqah Izzati Md Ishak","doi":"10.1016/j.oceram.2024.100637","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100637","url":null,"abstract":"<div><p>In this study, we report the low-cost synthesis of titanium carbide (TiC) from recycled precursors and further used to synthesize MAX phase material, Ti₃AlC₂. The recycled precursor, carbon extracted from the used tyres using a few processes is used to synthesize TiC with high purity. The use of tyre-derived carbon offers several environmental benefits such as facile synthesis, low cost, environment-friendly, etc. The as-synthesized TiC is further used as a precursor to synthesize low-cost Ti₃AlC₂. The structure of TiC and Ti₃AlC₂ are characterized by UV–visible spectroscopy and X-ray diffraction analysis. The microstructure and surface morphology of the samples are examined using scanning electron microscope imaging and energy-dispersive X-ray spectroscopy. The chemical bonding information is analyzed by Fourier transform infrared spectroscopy and the thermal behaviour of the samples are examined using thermogravimetric analysis. The successful cost-effective synthesis of TiC and Ti₃AlC₂ are confirmed from XRD analysis and the samples show high purity. TiC and Ti₃AlC₂ show excellent thermal stability which helps in their potential applications in the future. This study proclaims a new strategy to synthesize low-cost Ti₃AlC₂ MXene for the large-scale production using TiC precursor where the TiC precursor is synthesized using carbon precursor.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100637"},"PeriodicalIF":2.9,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524001019/pdfft?md5=404c6849962d4f986de289c07216e327&pid=1-s2.0-S2666539524001019-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141606185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predicting hardness of graphene-added Si3N4 using machine learning: A data-driven approach","authors":"Awais Qadir ,&nbsp;Shoaib Ali ,&nbsp;Jan Dusza ,&nbsp;David Rafaja","doi":"10.1016/j.oceram.2024.100634","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100634","url":null,"abstract":"<div><p>This study presents a data-driven framework based on machine learning (ML) using extreme gradient boosting (XGBoost) for predicting the hardness of silicon nitride (Si₃N₄) ceramics reinforced with graphene. The XGBoost model takes into account various factors such as graphene type and content, characteristics of the raw Si₃N₄ powder, the parameters of the sintering process (sintering technique, temperature, pressure, holding time), and the characteristics of the sintered samples, i.e., the density, <span><math><mrow><mfrac><mi>α</mi><mi>β</mi></mfrac></mrow></math></span> content and Vickers hardness. The parameters that influence the Si₃N₄ hardness most strongly are identified, with sintering pressure, sintering time and density being the most influential. The addition of graphene content up to a certain threshold (1 wt%) has a positive impact on hardness. However, beyond that it leads to a lower density and a lower mechanical performance. Sintering parameters, particularly the sintering pressure, temperature, holding time and technique, strongly affect the density, final grain size, <span><math><mrow><mfrac><mi>α</mi><mi>β</mi></mfrac></mrow></math></span> Si₃N₄ composition and subsequently the hardness. The study highlights the importance of density and the densification process in achieving high hardness in Si₃N₄ ceramics. The developed ML model provides a valuable tool for predicting the hardness of Si₃N₄+graphene ceramics composites and offers insights into selecting suitable graphene type, content, and processing parameters. While the study primarily focuses on Si₃N₄+graphene composites, this novel approach holds promise for the <em>in-silico</em> design and analysis of diverse ceramic materials.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100634"},"PeriodicalIF":2.9,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524000981/pdfft?md5=9e185e76da149e516359f8ad1226922d&pid=1-s2.0-S2666539524000981-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141594997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Boron induced abnormal grain growth in alumina","authors":"Christian Bechteler ,&nbsp;Hannes Kühl ,&nbsp;Richard I. Todd","doi":"10.1016/j.oceram.2024.100636","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100636","url":null,"abstract":"<div><p>In this work, hot-pressing of alumina in contact with hexagonal boron nitride or doped with boron carbide was conducted at 1500 °C for 30 min. After hot-pressing, abnormal grain growth induced by boron diffusion from these substances into alumina was detected, as clearly demonstrated with SEM, EDS, EBSD, and Raman spectroscopy. Grain boundary complexion transformations, solute drag, or another mechanism relating to interface-controlled grain boundary mobility are presumed to be the fundamental mechanism responsible for abnormal grain growth observed in this work.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100636"},"PeriodicalIF":2.9,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524001007/pdfft?md5=b26b21b171cc4fbebf973981b1c51573&pid=1-s2.0-S2666539524001007-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141595011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Nb2O5 doping on low-temperature sintering of TiO2-Al2O3 ceramics","authors":"Huei-Jyun Shih ,&nbsp;Ying-Chieh Lee ,&nbsp;Yu-De Li ,&nbsp;Chang-Ting Yang","doi":"10.1016/j.oceram.2024.100635","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100635","url":null,"abstract":"<div><p>This study investigates the effects of Nb₂O₅ as a dopant in TiO₂–Al₂O₃ ceramics to lower sintering temperature and enhance performance, including the physical, mechanical, and dielectric properties of the ceramics at sintering temperatures 1250 °C–1350 °C. Specifically, TiO₂–Al₂O₃ ceramics doped with 1.5 wt% Nb₂O₅ and sintered at 1350 °C exhibit remarkable density 94 %, compressive strength 1372 MPa, and abrasion resistance 1.36 × 10⁻⁴ mm³/N·m, surpassing those of pure alumina ceramics. This improvement is attributed to enhanced grain boundary diffusion and strain energy resulting from Nb⁵⁺ cation substitution. The incorporation of Nb₂O₅ in TiO₂–Al₂O₃ ceramics reduce sintering temperatures by 150–200 °C. The dielectric constant of TiO₂–Al₂O₃ ceramics doped with 1.5 wt% Nb₂O₅ sintered at 1350 °C is found to be 13.4, with a dielectric loss of 2.56 × 10⁻² and insulation resistance 7.3 × 10¹² Ω. Nb₂O₅ is an effective additive for reducing sintering temperatures in Al₂O₃ based ceramic.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100635"},"PeriodicalIF":2.9,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524000993/pdfft?md5=b93a1afe2e27d962b9facb5f4dbca5fc&pid=1-s2.0-S2666539524000993-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141595013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"“Hexacelsian slurry development for 2D woven alumina fiber impregnation in CMC fabrication”","authors":"Arnaud Saintonge ,&nbsp;William Krikorian ,&nbsp;James Braun ,&nbsp;Alexandre Allemand ,&nbsp;Thierry Piquero ,&nbsp;Sophie Beaudet-Savignat ,&nbsp;Yann Lepetitcorps","doi":"10.1016/j.oceram.2024.100633","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100633","url":null,"abstract":"<div><p>The rheological properties of BAS (BaAl₂Si₂O₈) slurries are investigated in order to optimize the impregnation of an alumina preform to manufacture oxide/oxide composite materials. The fiber preform morphology has been deeply investigated, especially the fiber to fiber gap within tows and compared to the grain size of the matrix powder. The slurry viscosity is measured as a function of powder and organic additives concentration to find the best combination. The optimal combination is evaluated by different measurements including: zeta potential, sedimentation and wettability to verify the slurry behavior for the fibers infiltration. An aqueous slurry containing 20–25 vol% of BAS with 1 wt% of dispersing agent (Darvan 821-A™) improved the rheological properties for fibers infiltration. Finally, characterizations of the composite show a good infiltration in the fiber tows spaces and indicate a mean porosity of 37 vol%, including 9 vol% of macroporosity.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100633"},"PeriodicalIF":2.9,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266653952400097X/pdfft?md5=c862400e36e79bee7f1ba43427f71ba2&pid=1-s2.0-S266653952400097X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141595012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ceramic fused filament fabrication (CF3) of alumina: Influence of powder particle morphology on processing and microstructure","authors":"Kameswara Pavan Kumar Ajjarapu,&nbsp;Srimanta Barui,&nbsp;Kavish Sudan,&nbsp;Saleh Khanjar,&nbsp;Kunal Kate","doi":"10.1016/j.oceram.2024.100631","DOIUrl":"https://doi.org/10.1016/j.oceram.2024.100631","url":null,"abstract":"<div><p>This study investigates ceramic fused filament fabrication (CF³) 3D printing of alumina with an emphasis on the impact of particle morphology on feedstock preparation and printability. Spherical powder displayed superior flow with higher apparent density, tap density, and powder packing fraction compared to irregular powder. A 55 vol % powder loading was chosen to ensure good flowability during printing. Irregular powder-based feedstocks had 40X higher viscosity than spherical powder feedstocks at 400 s⁻¹ shear rate, posing potential printing challenges. Slow printing speed maintained low feed-rates for consistent material flow. The debinding and sintering process produced macroscopically defect-free alumina components with relative densities above 89 % for both powder morphologies. The focus of the work is on comparing two different powder particle morphologies influencing feedstock behavior, printing fidelity, and sintered part properties.</p></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"19 ","pages":"Article 100631"},"PeriodicalIF":2.9,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666539524000956/pdfft?md5=70146338c9e39e7c3c9143ea5f9f898e&pid=1-s2.0-S2666539524000956-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141606184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}