Filtern
Erscheinungsjahr
Dokumenttyp
- Zeitschriftenartikel (79)
- Vortrag (52)
- Beitrag zu einem Tagungsband (18)
- Beitrag zu einem Sammelband (13)
- Posterpräsentation (12)
- Buchkapitel (2)
- Forschungsbericht (1)
Sprache
- Englisch (113)
- Deutsch (61)
- Mongolisch (3)
Schlagworte
- Glass (26)
- Sintering (20)
- Crystallization (10)
- LTCC (9)
- Foaming (7)
- Glas (7)
- Sintern (7)
- Viscosity (7)
- Water content (5)
- Crystal growth (4)
- EBSD (4)
- Inclusions (4)
- Internal friction (4)
- Kristallisation (4)
- Permeability (4)
- Solubility (4)
- Vickers indentation (4)
- Degassing (3)
- Glass matrix composites (3)
- Glass powder (3)
- Hydrogen (3)
- Modeling (3)
- Ontologie (3)
- Robotic melting (3)
- SOFC (3)
- Simulation (3)
- Sintering kinetics (3)
- Soda-lime-silica (3)
- Water (3)
- Workflow (3)
- Aluminosilicate glasses (2)
- Bildanalyse (2)
- Bioactive glass (2)
- Crack growth (2)
- Crack healing (2)
- DCB (2)
- Data Space (2)
- Diffusion (2)
- Diffusion coefficient (2)
- Diffusivity (2)
- Digitaler Zwilling (2)
- Diopsid (2)
- Fatigue (2)
- Fracture surface energy (2)
- Fragility (2)
- Glasmatrixkomposite (2)
- Glaspulver (2)
- Glass ceramic composites (2)
- Glass ceramics (2)
- Glass transition (2)
- Glasses (2)
- Hydrogen storage (2)
- Incinerator ash (2)
- Infrared spectroscopy (2)
- Ionic porosity (2)
- Lösung (2)
- ML (2)
- Mechanical properties (2)
- Modelling (2)
- NMR spectroscopy (2)
- Ontology (2)
- Oxide glasses (2)
- Oxidglas (2)
- Powder (2)
- Powders (2)
- Relaxation (2)
- Reprecipitation (2)
- Sewage sludge ash (2)
- Silicate glass (2)
- Silicates (2)
- Silikatgläser (2)
- Silver (2)
- Soda-lime silicate glass (2)
- Stress intensity factor (2)
- Viskosität (2)
- Wasser (2)
- Wassergehalt (2)
- Water in glass (2)
- Water speciation (2)
- 3D High-temperature shape screening (1)
- 3D etching (1)
- 3D-Formerkennung (1)
- Acid-leaching (1)
- Additive manufacturing (1)
- Al2O3-inclusions (1)
- Alkali aluminosilicate glasses (1)
- Alkali and alkaline earth silicate and borate glass (1)
- Alkali silicates (1)
- Alkali zinc borate glasses (1)
- Alpha-cordierite (1)
- Alumina dissolution (1)
- Aluminium phosphate (1)
- Aluminoborosilicate glass (1)
- Aluminum phosphate (1)
- Analytical scanning electron microscopy (1)
- Ash (1)
- Automated analysis (1)
- Back-filling specimen mount technique (1)
- Barium and calcium silicate plass powders (1)
- Batch reactions (1)
- Bioactive Glass (1)
- Blähen (1)
- Bond energy (1)
- Borate (1)
- Borate glasses (1)
- Boratgläser (1)
- Borosilicate glass (1)
- Brittle fracture (1)
- Bubble formation (1)
- Bulk diffusion (1)
- Burst test (1)
- Calculated intrinsic fracture toughness (1)
- Carrier gas analysis (1)
- Chemical durability (1)
- Chemical properties (1)
- Chemical stabilization of high-temperature forms (1)
- Coating (1)
- Cordierite (1)
- Corrosion (1)
- Crack growth in air (1)
- Cristobalite form (1)
- Crystal lattice (1)
- Crystal morphology (1)
- Crystal orientation (1)
- DCB geometry (1)
- DTA (1)
- Debindering (1)
- Deformationen (1)
- Densification (1)
- Diopside (1)
- Dissolved water (1)
- Dynamic mechanical analysis (1)
- Dynamisch Mechanische Analyse (1)
- Effective Viscosity (1)
- Efficiency (1)
- Elastic constants (1)
- Embedded cavities (1)
- Epoxy resin (1)
- Finite Differenzen (1)
- Fluorescence properties (1)
- Fly ash (1)
- Formerkennung (1)
- Formmessung (1)
- Fresnoite (1)
- Gas bubble formation (1)
- Gas calibration (1)
- Gasabgabe (1)
- Gasgehalt (1)
- Gehalt volatiler Spezies (1)
- Glas Matrix Composites (1)
- Glasig-kristalline Sinterwerkstoffe (1)
- Glasmatrix-Komposit (1)
- Glasmatrixkomposit (1)
- Glass Ceramic (1)
- Glass Matrix Composites (1)
- Glass capillaries (1)
- Glass ceramic (1)
- Glass crystallization stress (1)
- Glass forming melts (1)
- Glass liner (1)
- Glass manufacturing (1)
- Glass-ceramic (1)
- Glass-ceramics definition (1)
- Goldcluster (1)
- Hardness (1)
- Heißextraktion (1)
- Heißgasextraktion (1)
- High pressure (1)
- High temperature laser profilometry (1)
- Hochtemperatur (1)
- Hochtemperaturformerkennung (1)
- Horizontaldilatometer (1)
- Hydrogen diffusivity (1)
- Hydrogen gas (1)
- Hydrogen permeation (1)
- Hydrogen storage tank (1)
- Hydrous glass (1)
- Indentation (1)
- Indentation fracture toughness (1)
- Indialite (1)
- Ion beam erosion Sectioning (1)
- Keramikherstellung (1)
- Kinetic Modelling (1)
- Kinetik (1)
- Komposite (1)
- Kontur (1)
- Kristallwachstumsgeschwindigkeit (1)
- LTCC multilayer (1)
- Laser (1)
- Laser profilometry (1)
- Lasermesstechnik (1)
- Lasertriangulationssensor (1)
- Lead borate glasses (1)
- Lithiumionen-Batterie (1)
- Long-term calculation (1)
- Low pressure lamination (1)
- Luminescence (1)
- Mass spectroscopy (1)
- Master curve (1)
- Material Digital (1)
- Melting (1)
- Metallnanocluster (1)
- Micro fluidics (1)
- Microhardness (1)
- Microindentation (1)
- Microscopy (1)
- Milling (1)
- Mixing (1)
- Multilayer-Technik (1)
- Nanoparticles (1)
- Nanophotonik (1)
- Nanopowder (1)
- Non-desired foaming (1)
- Nucleation (1)
- Nucleation tendency (1)
- Nydrogen melting (1)
- Oberflächenkeimbildung (1)
- Optical microscopy (1)
- Optical properties (1)
- Optical solids (1)
- Optical spectroscopy (1)
- Optische Eigenschaften (1)
- Orientation (1)
- Phasenentwicklung (1)
- Phosphate (1)
- Photovoltaic modules (1)
- Polymer coating (1)
- Porosity (1)
- Powder preparation (1)
- Precursor chemistry (1)
- Prozessbegleitende Prüfung (1)
- Pulvermethode (1)
- Raman spectroscopy (1)
- Relaxationsphänomene (1)
- Rheology (1)
- Rietveld analysis (1)
- Rigid Inclusion (1)
- Robotische Glasschmelzanlage (1)
- Roughness (1)
- SEM (1)
- Sample preparation (1)
- Sand blasting (1)
- Scaffolds (1)
- Scanning electron microscopy (1)
- Schwindungsinhomogenitäten (1)
- Schwindungsverhalten (1)
- Shaping (1)
- Shear thinning (1)
- SiO2 (1)
- Silicate glass powders (1)
- Silicate glasses and crystals (1)
- Silicatglas (1)
- Silicatgläser (1)
- Silicoborate glasses (1)
- Silver metallization paste (1)
- Sinter retardation (1)
- Sinterglaskeramik (1)
- Sintering Kinetics (1)
- Sintering glass composit bio material (1)
- Sintermodelle (1)
- Sinterung (1)
- Slow crack growth (1)
- Soda lime silicate glass (1)
- Soda-lime-silica glass (1)
- Sodium ion batteries (1)
- Sol-gel (1)
- Solid-state reaction (1)
- Stable crack growth (1)
- Stacking disorder (1)
- Standard material (1)
- Steel (1)
- Storage (1)
- Strength (1)
- Stress intensity (1)
- Stress-corrosion (1)
- Structural relaxation (1)
- Struktur (1)
- Subcritical crack growth (1)
- Surface crystallization (1)
- Surface energy (1)
- Surface nucleation (1)
- Surface plasmon resonance (1)
- Surfaces and interfaces (1)
- Synchrotron radiation (1)
- Thermal analysis (1)
- Thermische Analyse (1)
- Thermo gravimetry (1)
- Thermoanalytical Methods (1)
- Titanium hydride (1)
- Toughness (1)
- Transmittance (1)
- Tridymite form (1)
- Ultrasonic relaxation (1)
- Unterschiedliche Atmosphären (1)
- Vacuum hot extraction (1)
- Viscous sintering (1)
- Viskoses Sintern (1)
- Wasserhaltige Gläser (1)
- Water-bearing glasses (1)
- X-ray lithography (1)
- hydrogen storage (1)
- robotische Glasschmelzanlage (1)
Organisationseinheit der BAM
Silicate glass fracture surface energy calculated from crystal structure and bond-energy data
(2023)
We present a novel method to predict the fracture surface energy, γ, of isochemically crystallizing silicate glasses using readily available crystallographic structure data of their crystalline counterpart and tabled diatomic chemical bond energies, D0. The method assumes that γ equals the fracture surface energy of the most likely cleavage plane of the crystal. Calculated values were in excellent agreement with those calculated from glass density, network connectivity and D0 data in earlier work. This finding demonstrates a remarkable equivalence between crystal cleavage planes and glass fracture surfaces.
Controlled oriented crystallization of glass surfaces is desired for high precision applications, since the uppermost crystal layer significantly influences the properties of the material. In contrast to previous studies, the data presented here deal with separated crystals growing at defect-free surfaces in four atmospheres with different degrees of humidity (ambient/dry air, argon and vacuum). A glass with the composition 2 BaO–TiO2–2.75 SiO2 was heat-treated at 825 °C until fresnoite (Ba2TiSi2O8) grew to a significant size. The crystal growth rate is found to increase with increasing humidity. The morphology of the crystals changes from highly distorted dendrites in the driest atmosphere (vacuum) to circular/spear-head-shaped crystals in the wettest atmosphere (ambient air), which we attribute to a decrease in viscosity of the glass surface due to water uptake. The least distorted crystals appear in the form of depressions of up to 6 µm. This has an influence on the observed crystal orientation, as measured by electron backscatter diffraction (EBSD). The pulled-in crystals change the orientation during growth relative to the flat glass surface due to an enrichment in SiO2 at the crystal fronts. This confirms that the orientation of crystals is not fixed following nucleation.
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.
This study investigates the sintering and crystallization behavior and kinetic of the bioactive glass (BG) 13–93 with nominal composition (in mol%): 54.6 SiO2 - 1.7 P2O3 - 22.1 CaO - 6.0 Na2O - 7.9 K2O - 7.7 MgO. Sintering and crystallization were investigated non-isothermally for various particle size fractions smaller than 315 μm as well as for bulk samples. Densification was not hindered by the presence of crystalline phases across all particle size fractions. Afterwards, wollastonite was found as the dominant crystal phase at higher temperature which resorb primary surface precipitation-like quartz crystallites. The growth direction shifts into volume when the sample surface is nearly covered. The crystal growth rate of wollastonite was calculated from the crystalline surface layer thickness measured during heating. The findings of this study are relevant for the high temperature processing of BG 13–93.
Glasses stand out by their wide and continuously tunable chemical composition and large variety of unique shaping techniques making them a key component of modern high technologies. Glass development, however, is still often too cost-, time- and energy-intensive. The use of robotic melting systems embedded in an ontology-based digital environment is intended to overcome these problems in future. As part of the German research initiative MaterialDigital, the joint project GlasDigital takes first steps in this direction. The project consortium involves the Fraunhofer ISC in Würzburg, the Friedrich Schiller University Jena (OSIM), the Clausthal University of Technology (INW), and the Federal Institute for Materials Research and Testing (BAM, Division Glasses) and aims to combine all main basic components required for accelerated data driven glass development. For this purpose, a robotic high throughput glass melting system is equipped with novel inline sensors for process monitoring, machine learning (ML)-based, adaptive algorithms for process monitoring and optimization, novel tools for high throughput glass analysis and ML-based algorithms for glass design, including software tools for data mining as well as property and process modelling. The talk gives an overview how all these tools are interconnected and illustrates their usability with some examples.
Gläser zeichnen sich durch eine breite und kontinuierlich abstimmbare chemische Zusammensetzung sowie einzigartige Formgebungstechniken aus, was sie oft zur Schlüsselkomponente moderner Hochtechnologien macht. Die Glasentwicklung ist jedoch oft noch zu kosten-, zeit- und energieintensiv. Der Einsatz von robotergestützten Schmelzsystemen, eingebettet in eine Ontologie-basierte digitale Umgebung, soll diese Probleme in Zukunft überwinden. Im Rahmen der BMBF Forschungsinitiative MaterialDigital unternimmt das Verbundprojekt GlasDigital „Datengetriebener Workflow für die beschleunigte Entwicklung von Glas“ erste Schritte in diese Richtung. Das Projektkonsortium, an dem das Fraunhofer ISC in Würzburg, die Friedrich-Schiller-Universität Jena (OSIM), die Technische Universität Clausthal (INW) und die Bundesanstalt für Materialforschung und -prüfung (BAM, Fachgruppe Glas) beteiligt sind, will alle wesentlichen Basiskomponenten für eine beschleunigte datengetriebene Glasentwicklung zusammenführen. Zu diesem Zweck wird ein robotergestütztes Hochdurchsatz-Glasschmelzsystem mit neuartigen Inline-Sensoren zur Prozessüberwachung, auf maschinellem Lernen (ML) basierenden adaptiven Algorithmen zur Prozessüberwachung und -optimierung, neuartigen Werkzeugen für die Hochdurchsatz-Glasanalyse sowie ML-basierten Algorithmen zum Glasdesign, Data Mining sowie Eigenschafts- und Prozessmodellierung ausgestattet. Der Vortrag gibt einen Überblick darüber, wie all diese Komponenten miteinander verzahnt sind, und veranschaulicht ihre Nutzbarkeit anhand einiger Beispiele.
lasses stand out by their wide and continuously tunable chemical composition and large variety of unique shaping techniques making them a key component of modern high technologies. Glass development, however, is still often too cost-, time- and energy-intensive. The use of robotic melting systems embedded in an ontology-based digital environment is intended to overcome these problems in future. As part of the German research initiative MaterialDigital, the joint project GlasDigital takes first steps in this direction. The project consortium involves the Fraunhofer ISC in Würzburg, the Friedrich Schiller University Jena (OSIM), the Clausthal University of Technology (INW), and the Federal Institute for Materials Research and Testing (BAM, Division Glasses) and aims to combine all main basic components required for accelerated data driven glass development. For this purpose, a robotic high throughput glass melting system is equipped with novel inline sensors for process monitoring, machine learning (ML)-based, adaptive algorithms for process monitoring and optimization, novel tools for high throughput glass analysis and ML-based algorithms for glass design, including software tools for data mining as well as property and process modelling. The talk gives an overview how all these tools are interconnected and illustrates their usability with some examples.