Glass Europe最新文献

Open Electrode Thermal Poling Setup for Treating Lithium-Aluminosilicate Glass-Ceramics Using Gas Discharge 利用气体放电处理锂铝硅酸盐玻璃陶瓷的开放电极热极化装置

Glass Europe Pub Date : 2024-08-09 DOI: 10.52825/glass-europe.v2i.1320

Jonas Hildebrand, Christian Roos

{"title":"Open Electrode Thermal Poling Setup for Treating Lithium-Aluminosilicate Glass-Ceramics Using Gas Discharge","authors":"Jonas Hildebrand, Christian Roos","doi":"10.52825/glass-europe.v2i.1320","DOIUrl":"https://doi.org/10.52825/glass-europe.v2i.1320","url":null,"abstract":"A setup for thermal poling treatment of glass and glass-ceramic via gas discharge using an open electrode configuration was built and tested successfully. In the setup a thin Pt-wire is used as a top electrode with adjustable distance to the glass sample. The glass rests on a Pt-sheet acting as bottom electrode which again rests on transporting rolls made of alumina. The setup is implemented in a specially built furnace in which the sample is moved underneath the static wire electrode. With this setup, lithium-aluminosilicate (LAS) glass samples were thermally poled at 200 °C for 20 min, 60 min and 180 min with discharge currents ranging from 25 µA to 300 µA. Over time the process gets more unstable but without any major breakdowns. The measured crystallinity at the anode side surface of the post-poling ceramised samples shows a decrease with both treatment time and poling current (i.e. electrical field strength). This is explained with the depletion of Li from the anode side surface layer which becomes stronger with higher electrical fields and continues over time. In scanning electron microscopy (SEM) images of cross sections of the anode sides a mostly glassy layer is observed which adds to the point aforementioned. As a key result this work proved that with an open electrode setup for thermal poling treatments of LAS glasses similar results can be achieved as with a blocking setup. This opens the door to the modification of glasses and corresponding glass-ceramics in an inline and continuous process that can be used industrially.","PeriodicalId":130330,"journal":{"name":"Glass Europe","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141923022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phosphate/Silicate Ratio Allows for Fine-Tuning of Bioactive Glass Crystallisation and Glass-Ceramic Microstructure 磷酸盐/硅酸盐比例可微调生物活性玻璃结晶和玻璃陶瓷微观结构

Glass Europe Pub Date : 2024-06-03 DOI: 10.52825/glass-europe.v2i.1187

A. C. Contreras Jaimes, Gloria Kirste, Christian Patzig, J. Martins de Souza e Silva, J. Massera, N. Karpukhina, Robert G. Hill, A. de Pablos-Martín, D. Brauer

{"title":"Phosphate/Silicate Ratio Allows for Fine-Tuning of Bioactive Glass Crystallisation and Glass-Ceramic Microstructure","authors":"A. C. Contreras Jaimes, Gloria Kirste, Christian Patzig, J. Martins de Souza e Silva, J. Massera, N. Karpukhina, Robert G. Hill, A. de Pablos-Martín, D. Brauer","doi":"10.52825/glass-europe.v2i.1187","DOIUrl":"https://doi.org/10.52825/glass-europe.v2i.1187","url":null,"abstract":"A combination of XRD, solid-state NMR and state-of-the-art imaging techniques were used to investigate how the calcium orthophosphate/calcium silicate ratio affects the crystallisation of bioactive glasses in the system SiO2-P2O5-CaO-CaF2. In the phosphate-free glass, xonotlite, wollastonite and cuspidine crystallised. From 2.4 mol% P2O5, fluorapatite also formed, while the amount of wollastonite decreased. Crystallisation tendency was low for low phosphate contents, while above 3 mol% P2O5 it increased. The phosphate-free glass showed a volume crystallisation mechanism with constant activation energy. By contrast, the glass with the largest phosphate to silicate ratio showed both volume and surface crystallisation, causing a pronounced decrease in activation energy with crystallisation degree. This work shows that by changing the phosphate/silicate ratio we can determine which crystal phases form, obtaining for example fluorapatite-free or wollastonite-free glass-ceramics, depending on the desired application and properties such as mechanical strength or activity in contact with physiological solutions.","PeriodicalId":130330,"journal":{"name":"Glass Europe","volume":"13 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141272093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of the Thermal Shock Resistance of Neodymium Doped Alumino-Phosphate Laser Glasses 评估掺钕磷铝激光玻璃的抗热震性

Glass Europe Pub Date : 2023-12-06 DOI: 10.52825/glass-europe.v1i.890

Crystal Guillet, Rafael José Jiménez-Riobóo, Francisco Muñoz

{"title":"Assessment of the Thermal Shock Resistance of Neodymium Doped Alumino-Phosphate Laser Glasses","authors":"Crystal Guillet, Rafael José Jiménez-Riobóo, Francisco Muñoz","doi":"10.52825/glass-europe.v1i.890","DOIUrl":"https://doi.org/10.52825/glass-europe.v1i.890","url":null,"abstract":"The resistance to thermal shock is one of the main properties to be considered in the design of glasses for their application as high power and high energy laser glasses. Neodymium doped phosphate glasses have inherent spectroscopic advantages for their use as laser hosts, however, their rather low mechanical performance can be a limiting factor for their use. It is very important to characterise the thermo-mechanical resistance of proprietary phosphate glass compositions as laser glasses, however, it is not common to find systematic studies on the influence of glass composition on the thermal shock resistance in phosphate glasses, which is defined as the mechanical resistance of the material to the stresses generated by thermal fluctuations. This includes considering the elastic properties of the medium, its thermal conductivity, the coefficient of thermal expansion and the fracture toughness. In the present work we have studied these properties in a series of alumino-phosphate glasses doped with Nd2O3 as a function of the alumina content. The above properties have been determined by Brillouin spectroscopy, dilatometry and thermal diffusivity, while the fracture toughness has been approached by means of a theoretical model that uses the calculation of the energy necessary to create a new surface while a pre-existing crack progresses. The results showed that the calculated fracture toughness agrees with the one of similar commercial laser glass compositions, and that the thermal shock resistance calculated in the metaphosphate glasses increases with the addition of Al2O3.","PeriodicalId":130330,"journal":{"name":"Glass Europe","volume":"58 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138596840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Viscous Sintering of Acid Leached Glass Powders 酸浸玻璃粉的粘性烧结

Glass Europe Pub Date : 2023-11-23 DOI: 10.52825/glass-europe.v1i.681

Roger Gomes Fernandes, R. Al-Mukadam, H. Bornhöft, S. Reinsch, Ralf Müller, Susanne Selle, J. Deubener

{"title":"Viscous Sintering of Acid Leached Glass Powders","authors":"Roger Gomes Fernandes, R. Al-Mukadam, H. Bornhöft, S. Reinsch, Ralf Müller, Susanne Selle, J. Deubener","doi":"10.52825/glass-europe.v1i.681","DOIUrl":"https://doi.org/10.52825/glass-europe.v1i.681","url":null,"abstract":"The process of viscous flow sintering is a phenomenon that is closely linked to the surface properties of the glass particles. In this work, we studied the extreme case of acid-leaching of soda-lime-silicate glass beads of two different particle size distributions and its effects on non-isothermal viscous sintering of powder compacts. Depth profiling of the chemical composition after leaching revealed a near-surface layer depleted in alkali and alkaline earth ions, associated with concurrent hydration as mass loss was detected by thermogravimetry. Heating microscopy showed that acid treatment of glasses shifted the sinter curves to higher temperatures with increasing leaching time. Modelling of the shrinkage with the cluster model predicted a higher viscosity of the altered surface layer, while analysis of the time scales of mass transport of mobile species (Na+, Ca2+ and H2O) during isochronous sintering revealed that diffusion of Na+ can compensate for concentration gradients before sintering begins. Also, exchanged water species can diffuse out of the altered layer, but the depletion of Ca2+ in the altered surface layer persists during the sinter interval, resulting in a glass with higher viscosity, which causes sintering to slow down.","PeriodicalId":130330,"journal":{"name":"Glass Europe","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139245795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface Hardness and Abrasion Threshold of Chemically Strengthened Soda-Lime Silicate Glasses After Steam Processing 蒸汽处理后化学强化钠石灰硅酸盐玻璃的表面硬度和磨损阈值

Glass Europe Pub Date : 2023-08-16 DOI: 10.52825/glass-europe.v1i.435

Gohar Sani, Roman Sajzew, R. Limbach, S. Sawamura, A. Koike, L. Wondraczek

引用次数: 0

Hydrogen Permeability of Tectosilicate Glasses for Tank Barrier Liners 储罐屏障衬里用构造硅酸盐玻璃的透氢性能

Glass Europe Pub Date : 2023-06-26 DOI: 10.52825/glass-europe.v1i.425

S. Reinsch, T. Welter, R. Müller, J. Deubener

引用次数: 0