55245
2022
eng
1
11
article
Wiley online library
1
--
--
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Sintering and foaming of bioactive glasses
Sintering, crystallization, and foaming of 44.8SiO2–2.5P2O3–36.5CaO–6.6Na2O–6.6K2O–3.0CaF2 (F3) and 54.6SiO2–1.7P2O3–22.1CaO–6.0Na2O–7.9K2O–7.7MgO (13–93) bioactive glass powders milled in isopropanol and CO2 were studied via heating microscopy, differential thermal analysis, vacuum hot extraction (VHE), Infrared spectroscopy, and time-of-flight secondary ion mass spectrometry. Full densification was reached in any case and followed by significant foaming.
VHE studies show that foaming is driven by carbon gases and carbonates were detected by Infrared spectroscopy to provide the major foaming source. Carbonates could be detected even after heating to 750◦C, which hints on a thermally very stable species or mechanical trapping. Otherwise, dark gray compact colors for milling in isopropanol indicate the presence of residual carbon as well. Its significant contribution to foaming, however, could not be proved and might be
limited by the diffusivity of oxygen needed for carbon oxidation to carbon gas.
Journal of American Ceramic Society
0002-7820
10.1111/jace.18626
urn:nbn:de:kobv:b43-552454
publish
13.07.2022
false
true
Creative Commons - CC BY - Namensnennung 4.0 International
Carsten Blaeß
Ralf Müller
eng
uncontrolled
Bioactive Glass
eng
uncontrolled
Crystallization
eng
uncontrolled
Foaming
eng
uncontrolled
Sintering
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.6 Glas
Material
Degradation von Werkstoffen
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/55245/2022 Blaess Sintering and foaming of bioactive glasses.pdf
54881
2022
eng
1
5
14
article
Elsevier B.V.
0
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--
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Internal nucleation tendency and crystal surface energy obtained from bond energies and crystal lattice data
We present an easy-to-apply method to predict structural trends in the internal nucleation tendency of oxide glasses. The approach is based on calculated crystal fracture surface energies derived from easily accessible diatomic bond energy and crystal lattice data. The applicability of the method is demonstrated on literature nucleation data for isochemically crystallizing oxide glasses.
Journal of Non-Crystalline Solids: X
10.1016/j.nocx.2022.100093
2590-1591
urn:nbn:de:kobv:b43-548814
publish
Creative Commons - CC BY - Namensnennung 4.0 International
Christopher Tielemann
Stefan Reinsch
Robert Maaß
J. Deubener
Ralf Müller
eng
uncontrolled
Glass
eng
uncontrolled
Nucleation tendency
eng
uncontrolled
Fracture surface energy
eng
uncontrolled
Crystal lattice
eng
uncontrolled
Bond energy
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.6 Glas
Material
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
5.0 Abteilungsleitung und andere
Materialdesign
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/54881/Internal nucleation tendency and crystal surface energy.pdf
55253
2022
eng
lecture
0
--
--
--
3D printing of crystallizing bioactive glasses
Artificial bone replacement by individual customized three-dimensional resorbable bioactive glass has not yet been widely established in the clinical use. This is mainly due to the antagonism of sintering ability and suitable bioactivity. Competitive crystallization often prevents the generation of dense sintered bodies, especially for additive manufactured 3D structures. Previous studies of the fluoride-containing glass F3 have shown its potential to combine both sintering ability and suitable bioactivity. Furthermore, the occurring sintering blockade by surface crystallization of Na2CaSi2O6 was tunable by glass particle size.
In this study the glasses F3, F3-Cu with 1 mol% CuO added at the expense of CaO and the well-known 13-93 were chosen to determine the influence of surface crystallization on 3D printed sinter bodies. For this purpose, grain size fractions in range of smaller 32 µm to 315 µm in fraction size of 6-20 µm were sieved from jaw crushed glass frit as well as glass cubes were cut from casted blocks for all glasses. Sintering behavior of both pressed and printed powder compacts was observed via heating microscopy. Crystallization was determined by DTA and crystallization progress was monitored on fractured sinter bodies and polished cubes via electron and laser scanning microscopy as well as with diffractometry.
Depending on grain size the formation of crystalline support framework along former grain boundaries shows the capability to stabilize fully densified sinter bodies before softening. Beside of this, the generation of complex hierarchic porosity was possible as well.
ICG Berlin 2022
Berlin, Germany
03.07.2022
08.07.2022
publish
false
true
0
Carsten Blaeß
eng
uncontrolled
Bioactive Glass
eng
uncontrolled
Crystallization
eng
uncontrolled
Sintering
eng
uncontrolled
3D printing
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.4 Multimateriale Fertigungsprozesse
5.6 Glas
Material
Degradation von Werkstoffen
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
56280
2022
eng
lecture
0
--
--
--
Glass Screening for the systematic development of new glasses
Die technischen Möglichkeiten der robotischen Glasschmelzanlage der BAM werden vorgestellt.
26th International Conference on Glass
Berlin, Germany
04.07.2022
08.07.2022
publish
false
true
0
M. Kilo
deu
uncontrolled
Material Digital
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.6 Glas
Material
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
Materialdesign
56282
2022
deu
lecture
0
--
--
--
GlasDigital - Datengetriebener Workflow für die beschleunigte Entwicklung von Glas
Das Projekt GlasDigital im Rahmen der BMBF Initiative MaterialDigital wird vorgestellt.
MatFo22
Berlin, Germany
14.11.2022
publish
false
true
0
Ralf Müller
deu
uncontrolled
Material Digital
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.6 Glas
Material
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
Materialdesign
56070
2022
eng
lecture
0
--
--
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Surface-Initiated Microstructure Formation in Glass Ceramics
Up to now, oriented surface crystallization phenomena are discussed controversially, and related studies are restricted to few glasses. For silicate glasses we found a good correlation between the calculated surface energy of crystal faces and oriented surface nucleation. Surface energies were estimated assuming that crystal surfaces resemble minimum energy crack paths along the given crystal plane. This concept was successfully applied by Rouxel in calculating fracture surface energies of glasses. Several oriented nucleation phenomena can be herby explained assuming that high energy crystal surfaces tend to be wetted by the melt. This would minimize the total interfacial energy of the nucleus. Furthermore, we will discuss the evolution of the microstructure and its effect on the preferred crystal orientation.
26th International Congress on Glass
Berlin, Germany
03.07.2022
08.07.2022
publish
false
true
0
Stefan Reinsch
eng
uncontrolled
Glass
eng
uncontrolled
Oriented surface crystallization
eng
uncontrolled
Surface energy
eng
uncontrolled
Bond energy
eng
uncontrolled
Nucleation mode
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.6 Glas
Material
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
56074
2022
eng
poster
0
--
--
--
Oriented Surface Crystallization
Up to now, oriented surface crystallization phenomena are discussed controversially, and related studies are restricted to few glasses. For silicate glasses we found a good correlation between the calculated surface energy of crystal faces and oriented surface nucleation. Surface energies were estimated assuming that crystal surfaces resemble minimum energy crack paths along the given crystal plane. This concept was successfully applied by Rouxel in calculating fracture surface energies of glasses. Several oriented nucleation phenomena can be herby explained assuming that high energy crystal surfaces tend to be wetted by the melt. This would minimize the total interfacial energy of the nucleus. Furthermore, we will discuss the evolution of the microstructure and its effect on the preferred crystal orientation.
26th International Congress on Glass
Berlin, Germany
03.07.2022
08.07.2022
publish
false
true
Christopher Tielemann
eng
uncontrolled
Glass
eng
uncontrolled
Surface energy
eng
uncontrolled
Crystal orientation
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.6 Glas
Material
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
56485
2022
eng
lecture
0
--
--
--
Vacuum crack growth in silicate glasses
Although the slow crack growth in glass is dominated by stress-corrosion phenomena, it also should reflect the underlaying intrinsic fracture behavior controlled by glass chemistry and structure. To investigate such underlaying phenomena, crack growth velocity in alkali silicate glasses was measured in vacuum across 10 orders of magnitude with double cantilever beam technique. Measured and literature crack growth data were compared with calculated intrinsic fracture toughness data obtained from Young’s moduli and theoretical fracture surface energy. Data analysis reveals slight correlation with the packing density and significant deviations from the intrinsic brittle fracture behavior. These deviations do not follow simple compositional trends. Two opposing processes may explain this finding: a decrease in the apparent fracture surface energy due to stress-induced chemical changes at the crack tip and its increase due to energy dissipation during fracture.
26th International Congress on Glass
Berlin, Germany
03.07.2022
08.07.2022
publish
false
true
0
Tina Waurischk
eng
uncontrolled
Oxide glass
eng
uncontrolled
Fracture toughness
eng
uncontrolled
Fracture surface
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.6 Glas
Material
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
Materialdesign
56489
2022
eng
poster
0
--
--
--
Data-driven Workflow for Accelerated Glass Development (GlasDigital)
As part of a joint project involving the Fraunhofer Institute for Silicate Research (ISC), the Friedrich Schiller University of Jena, the Clausthal University of Technology and the Federal Institute for Materials Research and Testing (BAM), digital tools are to be created for the development of new types of glass materials. Current processes for the production of glasses with improved properties are usually very cost- and energy-intensive due to the low degree of automation and are subject to long development cycles. The use of robotic synthesis processes in combination with self-learning machines is intended to overcome these problems in the long term. The development of new types of glass can then not only be accelerated considerably, but also be achieved with much less effort.
In this talk, data generation via a robotic high-throughput glass melting system is presented, which should be the experimental basis for the ontology developed within the project GlasDigital.
Materials Science and Engineering Congress (MSE 2022)
Darmstadt, Germany
27.09.2022
publish
29.09.2022
false
true
Tina Waurischk
deu
uncontrolled
Oxidglas
deu
uncontrolled
Robotische Glasschmelzanlage
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.6 Glas
Material
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
Materialdesign
56491
2022
deu
poster
0
--
--
--
Datengetriebener Workflow für die beschleunigte Entwicklung von Glas (GlasDigital)
Das Projekt GlasDigital wurde im allgemeinen vorgestellt, sowie die einzelnen Zwischenstände der verschiedenen Arbeitspakete aller Projektpartner präsentiert. Die allgemeine Porjektvorstellung ist auf deutsch. Die Zwischenstände der Arbeitsinhalte sind auf englisch.
PMD Vollversammlung
Berlin, Germany
03.11.2022
publish
false
true
Tina Waurischk
Stefan Reinsch
Ralf Müller
Y.-F. Chen
A. Contreras Jaimes
deu
uncontrolled
Oxidglas
deu
uncontrolled
Robotische Glasschmelzanlage
deu
uncontrolled
ML
deu
uncontrolled
Ontologie
deu
uncontrolled
Digitaler Zwilling
deu
uncontrolled
Bildanalyse
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.6 Glas
Material
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
Materialdesign