Open Ceramics最新文献_第8页

Alkaline attack of boro-alumino-silicate glass: New insights of the molecular mechanism of cold consolidation and new applications 硼铝硅酸盐玻璃的碱性侵蚀：冷固结分子机理的新认识及新应用

IF 2.9

Open Ceramics Pub Date : 2024-12-09 DOI: 10.1016/j.oceram.2024.100726

Giulia Tameni , Diana Lago , Hana Kaňková , Lenka Buňová , Jozef Kraxner , Dušan Galusek , Daniel M. Dawson , Sharon E. Ashbrook , Enrico Bernardo

{"title":"Alkaline attack of boro-alumino-silicate glass: New insights of the molecular mechanism of cold consolidation and new applications","authors":"Giulia Tameni , Diana Lago , Hana Kaňková , Lenka Buňová , Jozef Kraxner , Dušan Galusek , Daniel M. Dawson , Sharon E. Ashbrook , Enrico Bernardo","doi":"10.1016/j.oceram.2024.100726","DOIUrl":"10.1016/j.oceram.2024.100726","url":null,"abstract":"<div><div>This paper focuses on the activation of boro-alumino-silicate glass from discarded pharmaceutical containers as fine powders suspended in relatively diluted alkaline solutions (2.5 M NaOH/KOH), followed by drying at 40 °C for 7 days. A specific molecular mechanism of glass hardening is proposed. Unlike geopolymers, the hardening does not result from the condensation of products of extensive dissolution. Instead, condensation reactions occur in hydrated surface layers, leading to strong bonds (Si-O-Si, Al-O-Si, etc.) between individual glass particles. Silicates, borates, and aluminates from glass dissolution combine with alkaline ions, yielding additional soluble phases. This mechanism is supported by the results of solid-state NMR spectroscopy and elemental analysis using ICP-OES. Stable matrices prepared by direct foaming or by the inclusion of cenospheres or commercial expanded glass (Poraver®) can be exploited for the fabrication of lightweight components</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100726"},"PeriodicalIF":2.9,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160267","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}

引用次数: 0

Microstructure and thermal-mechanical evolution of high-entropy pyrochlore (A2B2O7) with dual crystalline phase 具有双晶相的高熵焦绿石（A2B2O7）的显微结构和热力学演化

IF 2.9

Open Ceramics Pub Date : 2024-12-07 DOI: 10.1016/j.oceram.2024.100723

Kun Yang , Minghao Zhao , Huan Li , Chengying Bai

引用次数: 0

A simple and industrially scalable process for recycling hexaferrite ceramic magnets 回收六铁氧体陶瓷磁体的简单和工业可扩展的过程

IF 2.9

Open Ceramics Pub Date : 2024-12-07 DOI: 10.1016/j.oceram.2024.100724

Alba Berja , Daniel Casaleiz , Cecilia Granados-Miralles , Karla Kosmač , Boris Saje , Tina Frangež , Slavko Dvoršak , Zoran Samardžija , Benjamin Podmiljšak , Jose Francisco Fernández , Adrián Quesada

{"title":"A simple and industrially scalable process for recycling hexaferrite ceramic magnets","authors":"Alba Berja , Daniel Casaleiz , Cecilia Granados-Miralles , Karla Kosmač , Boris Saje , Tina Frangež , Slavko Dvoršak , Zoran Samardžija , Benjamin Podmiljšak , Jose Francisco Fernández , Adrián Quesada","doi":"10.1016/j.oceram.2024.100724","DOIUrl":"10.1016/j.oceram.2024.100724","url":null,"abstract":"<div><div>The demand for hexaferrite (BaFe<sub>12</sub>O<sub>19</sub>/SrFe<sub>12</sub>O<sub>19</sub>) permanent magnets is expected to rise in the next 5–10 years due to their potential as a sustainable alternative to rare-earth magnets. Currently, less than 1 % of recycling of permanent magnets occurs worldwide. This study presents a successful method for recycling strontium ferrite magnets from end-of-life household appliances, fabricating recycled bonded magnets as a first step to implement a circular economy in the value chain. This industrially scalable method optimizes comminution and annealing of recovered ceramic magnets, yielding powders with particle sizes below 2 µm. Thermal treatment at 900–1000 °C recovers competitive magnetic properties. A pilot batch of recycled hexaferrite bonded magnets, produced via injection moulding, exhibited excellent mechanical and magnetic properties, with coercivity H<sub>cj</sub> of 190.1 kA/m, remanent polarization J<sub>r</sub> of 234.3 mT, and maximum energy product (<em>BH</em>)<sub>max</sub> of 10.4 kJ/m³, comparable to commercial ferrite bonded magnets.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100724"},"PeriodicalIF":2.9,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160270","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}

引用次数: 0

Negative dielectric constant and impedance analysis of novel self-generated Ti3AlC2 and Ti4AlN3 Max phase reinforced boron composites 新型自生成Ti3AlC2和Ti4AlN3 Max相增强硼复合材料的负介电常数和阻抗分析

IF 2.9

Open Ceramics Pub Date : 2024-12-06 DOI: 10.1016/j.oceram.2024.100721

Md. Shahinoor Alam , Mohammad Asaduzzaman Chowdhury , Md. Arefin Kowser , Md. Moynul Islam , M.A. Gafur , Md. Shofiqul Islam

引用次数: 0

Mesoscale simulations of aqueous suspension-based electrophoretic coating process 基于水悬浮液的电泳涂层过程的中尺度模拟

IF 2.9

Open Ceramics Pub Date : 2024-12-05 DOI: 10.1016/j.oceram.2024.100722

Mélina Noblesse , Lisa Pin , Sandrine Duluard , Florence Ansart , Céline Merlet

引用次数: 0

Water-based 8YSZ electrolyte suspension optimised by design of experiments 通过实验设计对水基8YSZ电解质悬浮液进行了优化

IF 2.9

Open Ceramics Pub Date : 2024-12-03 DOI: 10.1016/j.oceram.2024.100717

Bernardo Jordão Moreira Sarruf , Laura Buccoli , Zoé Barbry

{"title":"Water-based 8YSZ electrolyte suspension optimised by design of experiments","authors":"Bernardo Jordão Moreira Sarruf , Laura Buccoli , Zoé Barbry","doi":"10.1016/j.oceram.2024.100717","DOIUrl":"10.1016/j.oceram.2024.100717","url":null,"abstract":"<div><div>Solid oxide cells are approaching commercial viability, with most of the currently used materials representing state-of-the-art advancements. However, widespread market adoption hinges on reducing costs. In this context, manufacturing improvements—particularly those that minimise material waste during production—can play a crucial role in lowering the capital expenditure (CAPEX) of solid oxide cells, ultimately influencing the levelised cost of fuel for end users.</div><div>This study presents an optimisation of electrolyte slurry formulation for tape casting. By controlling variables such as solid loading, binder content, milling parameters, and casting conditions, we achieved reproducible results in electrolyte thickness, porosity, and electrical conductivity.</div><div>The slurries were prepared by ball milling, employing a range of compositions that included both low and high solid and binder contents. The resulting rheological profiles, tape quality, thickness, and porosity were carefully evaluated. The experimental design culminated in an optimised composition, for which electrical conductivity was measured using electrochemical impedance spectroscopy. The impedance data were deconvoluted into grain bulk and grain boundary contributions, enabling further refinement of the sintering temperature and subsequent microstructure.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100717"},"PeriodicalIF":2.9,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160271","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}

引用次数: 0

A concept for functional bioceramics with embedded metallization using cold sintering 一种采用冷烧结的嵌入式金属化功能生物陶瓷的概念

IF 2.9

Open Ceramics Pub Date : 2024-12-02 DOI: 10.1016/j.oceram.2024.100716

Aliya Sharipova, Andreas Böhme, Marco Fritsch, Matthias Ahlhelm

引用次数: 0

Development of porous ceramic moulds for hot slumping of astronomical glass mirror substrates 天文玻璃镜面基板热坍落用多孔陶瓷模具的研制

IF 2.9

Open Ceramics Pub Date : 2024-12-01 DOI: 10.1016/j.oceram.2024.100712

Veronika Stieglitz , Matthias Krödel , Stefan Menzel

{"title":"Development of porous ceramic moulds for hot slumping of astronomical glass mirror substrates","authors":"Veronika Stieglitz , Matthias Krödel , Stefan Menzel","doi":"10.1016/j.oceram.2024.100712","DOIUrl":"10.1016/j.oceram.2024.100712","url":null,"abstract":"<div><div>The key goal of this project was to develop a porous ceramic that could be used as a mould material for the heat bending of glass. Heat-bent – slumped – glass has a wide range of uses, from miniature lenses for smartphone cameras or elegantly shaped touch displays to precisely shaped mirrors. The project PräBieD (Präzisionsbiegen von Dünnglas, “precise bending of thin glass”) brought together different stakeholders from the fields of science and industry. The outcome of their cooperation was an exemplary mould for shaping glass segments for the experimental Wolter I X-ray telescope. Compared, for example, to nickel (XMM) or Zerodur (Chandra), telescope segments of this kind could have a much lower weight and thickness, and therefore also a higher collecting area. The most important requirements in terms of the material are a coefficient of thermal expansion close to that of the glass so as not to disturb the required shape during the hot slumping process, chemical and heat stability to prevent mirror contamination by outgassing during slumping, no adhesivity between the glass and the mould, porosity so that glass bending can be supported by pumping through the mould’s surface, and the possibility to machine the surface with sufficient accuracy. This paper briefly describes the process of manufacturing ceramics and the features of the material developed as they are revealed during its evolution.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100712"},"PeriodicalIF":2.9,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160272","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}

引用次数: 0

Effect of carbonate and silicate on the microstructural properties of the MgO-activated slag binder 碳酸盐和硅酸盐对氧化镁活性渣粘结剂微观结构性能的影响

IF 2.9

Open Ceramics Pub Date : 2024-12-01 DOI: 10.1016/j.oceram.2024.100715

Hongqiang Ma , Enyang Dai , Guangxue Liu , Xinhua Yuan , Jialong Wu , Jingjing Feng

引用次数: 0

Pressure-assisted sintering approaches for up-converting LiYF4:Er/Yb transparent oxyfluoride glass-ceramics 上转化LiYF4:Er/Yb透明氟氧玻璃陶瓷的压力辅助烧结方法

IF 2.9

Open Ceramics Pub Date : 2024-12-01 DOI: 10.1016/j.oceram.2024.100713

N.M.P. Truong , M. Michálková , M. Sedano , M.J. Pascual , R. Klement

{"title":"Pressure-assisted sintering approaches for up-converting LiYF4:Er/Yb transparent oxyfluoride glass-ceramics","authors":"N.M.P. Truong , M. Michálková , M. Sedano , M.J. Pascual , R. Klement","doi":"10.1016/j.oceram.2024.100713","DOIUrl":"10.1016/j.oceram.2024.100713","url":null,"abstract":"<div><div>Glasses of compositions 40SiO<sub>2</sub>-25Al<sub>2</sub>O<sub>3</sub>-18Li<sub>2</sub>O-7LiF-(10-x-y)YF<sub>3</sub>-xErF<sub>3</sub>-yYbF<sub>3</sub> (mol.%, <em>x</em> = 0.1, 0.5; <em>y</em> = 0, 0.4, 2, 4) were prepared by melt-quenching technique and milled into powders. Glass powder pellets were treated by hot pressing at defined temperatures to obtain the corresponding glass-ceramics (GCs). High-resolution TEM and XRD analysis revealed the crystallization of LiYF<sub>4</sub> and LiAlSiO<sub>4</sub> phases with nano-crystal size below 50 nm, resulting in translucent GCs. The density of GCs was 98–99.5 % compared to parent glasses. GCs exhibited intense up-conversion emission when excited by near-infrared light at 980 nm. As Er<sup>3+</sup> concentration increased from 0.1 to 0.5 mol.% in the samples, notable enhancement in green and red emission intensities was indicated. Yb<sup>3+</sup> ions significantly facilitated up-conversion emission through energy transfer to Er<sup>3+</sup> ions, resulting in a higher luminescence yield compared to Er<sup>3+</sup> single-doped GCs. The tuning of the red to green emission intensity ratio can be achieved by varying Er<sup>3+</sup> and Yb<sup>3+</sup> concentrations and Er<sup>3+</sup>/Yb<sup>3+</sup> ratio.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"20 ","pages":"Article 100713"},"PeriodicalIF":2.9,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746868","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}

引用次数: 0