Dr. rer. nat. Ulf Betke
Dr. rer. nat. Ulf Betke
Chair of Ceramics
Current projects
Secondary phases in ceramics made of materials with adamantanoid crystal structure - doping, structural chemistry and properties
Duration: 01.08.2024 bis 31.07.2026
Adamantane-like compounds contain materials whose crystal structure can be derived from the adamantane base body or the structure of the diamond. Examples include ceramics such as SiC, AlN and ZnO, which all crystallize in the wurzite structure, the diamond lattice for binary compounds. The basic structure contains a tetrahedral environment for cations and anions. Due to the simple structure, the adamantane-like compounds have good phonon conductivity and, as a result, good thermal conductivity. Due to the large covalent bonding components, high temperatures and/or sintering additives are usually required for sintering these compounds.
Due to the complex composition of the ceramic raw material (base material + sintering aids), the formation of various secondary phases, for example Y-Al-O compounds in the system AlN-Y2O3, often occurs. These secondary phases significantly influence the properties of the base material. The phase evolution in the system AlN-Y2O3 is well studied, while for the system ZnO-Sb2O3-Bi2O3 phases of unknown structure often occur. At the same time, the phase equilibria are fundamentally influenced by the presence of other metal cations as dopants. Therefore, the investigation of the phase composition by means of powder diffraction is one focus. Another focus is the investigation of the structural-chemical influence of dopants introduced into corresponding secondary phases. This also includes the structural characterization of unknown phases - if purely representable - on the basis of data obtained from powder X-ray diffraction. These investigations are supported by quantum chemical (DFT) calculations.
This text was translated with DeepL
Completed projects
Sintering behavior of reticulated porous ceramics (RPCs)
Duration: 01.01.2020 bis 31.12.2022
Cellular ceramics are of great importance in the metalworking industry as a filter medium for molten metals in foundry processes. The Schwartzwalder or replica process is the state of the art for the production of these ceramic foams. The basis is the application of a ceramic dispersion to a polymer foam template, followed by burning out the template and sintering the green body. The resulting ceramic foams are characterized by cavities in the web material resulting from the burnout of the template structure and longitudinal cracks in the webs resulting from the incomplete coating of the template. These cavities and cracks offer the potential for functionalization of the cellular ceramic, for example by loading with active species, but also limit the mechanical stability of the structure.
There are isolated, qualitative descriptions of the formation of cracks in the bar material in the literature, which take into account factors such as the wetting of the polymer template as well as thermal expansion and gas development during the template burnout. However, a systematic investigation of the effects, which also includes the shrinkage of the web material, is lacking.
The aim of the project is to investigate the hollow web structure - on the one hand in simplified model systems and on the other hand in cellular structures - as a function of the sintering temperature. Polymer rods with different cross-sectional profiles are used as model systems, which can be coated with ceramic dispersion in a very defined way by dip coating. Model materials are common engineering ceramics such as alumina or zirconia. The samples - model bridges as well as cellular ceramics - are primarily examined using micro-computed tomography. This method allows the precise analysis of material thickness and cavities in the examined structures. The final aim of the project is to develop a model that can be used to predict the hollow web volume on the one hand, and the frequency and dimension of longitudinal cracks in the web material on the other, as a function of the sintering temperature for a ceramic material of known shrinkage. This allows the process optimization for the production of replica foams - both with regard to an improvement in strength (avoidance of cracks) and with regard to a hollow web functionalization (control of the hollow web accessibility).
This text was translated with DeepL
Cellular ceramics from adamantine compounds
Duration: 01.01.2020 bis 31.12.2022
Adamantane-like compounds contain materials whose crystal structure can be derived from the adamantane matrix or the structure of diamond. Examples are ceramics such as SiC, AlN but also ZnO, which all crystallize in the wurzite structure, the diamond lattice for binary compounds. The basic structure contains a tetrahedral environment for both cations and anions. Due to the simple structure, the adamantane-like compounds have good phonon conductivity and, as a result, good thermal conductivity. Due to the large covalent bond fractions, high temperatures and/or sintering additives are usually required for sintering these compounds. With the exception of SiC, hardly any cellular ceramics have been produced from these materials to date.
The aim of the project is the production and characterization of cellular ceramics - primarily from the adamantane-like compounds AlN and ZnO. This includes the development of suitable dispersions for the application of the Schwartzwalder process as well as the selection of suitable sintering additives and sintering conditions. The foams obtained will then be characterized with regard to their microstructure and properties (thermal conductivity, mechanical properties).
Due to the complex composition of the ceramic raw material (base material + sintering aids), the formation of various secondary phases, for example Y-Al-O compounds in the system AlN-Y2O3, often occurs. These secondary phases significantly influence the properties of the base material. The phase evolution in the system AlN-Y2O3 is well studied, while for the system ZnO-Sb2O3-Bi2O3 phases of unknown structure often occur. Therefore, the investigation of the phase composition in the ceramic web material of the foams produced using the powder diffraction method is a focal point. This also includes the structural characterization of unknown phases - if purely representable - on the basis of data obtained from powder X-ray diffraction.
This text was translated with DeepL
Novel composite materials for thermochemical energy storage, BMBF junior research group NEOTHERM
Duration: 01.06.2013 bis 31.05.2018
The interdisciplinary junior research group Novel Composite Materials for Thermochemical Energy Storage (NEOTHERM) develops, characterizes and evaluates micro-macro-porous composite materials for thermochemical energy storage. The aim is to provide sorption materials for the sorbate water with high storage density, effective heat transfer and application-adapted sorption temperature ("20-500 °C) and suitable temperature range both for the storage of solar heat and for energy recovery from technical processes. To this end, cellular materials are to be developed as carrier materials and optimized with regard to their chemical, morphological and thermal properties. In parallel, microporous crystalline compounds (metal organic frameworks = MOFs and zeolites) are to be developed and/or modified as active components of heat storage and fixed to the carrier, e.g. by means of in-situ crystallization or carrier-linker reaction. The junior research group will work on the following aspects of the new material composites: (1) Synthesis of new or (2) Development of manufacturing processes for macroporous monolithic materials with variable surface chemical and thermal properties and specifically adjusted, open porosity (carrier), (3) Coating/surface modification of open-cell foams to adjust the sorption properties of the composite material, (4) Control of adsorption and desorption processes in porous solids by controlling the pore size and shape, (5) Evaluation of the long-term behavior of the heat storage materials. The development of the new materials is carried out from the outset with a view to their technical application in terms of working temperature, charging/discharging behavior, long-term stability, storage density, costs and safety.
2025
Peer-reviewed journal article
Effects of Cr addition on Ti implant alloys (Ti-Cr/Ti-Al-V-Cr) to enhance corrosion and wear resistance
Herbster, Maria; Garke, Bernd; Harnisch, Karsten; Michael, Oliver; Lieb, Alexandra; Betke, Ulf; Könnecke, Mandy; Heyn, Andreas; Kriegel, Paulina; Thärichen, Henrike; Bertrand, Jessica; Krüger, Manja; Halle, Thorsten
In: Journal of the mechanical behavior of biomedical materials - Amsterdam [u.a.] : Elsevier, Bd. 164 (2025), Artikel 106899, insges. 23 S.
2024
Peer-reviewed journal article
Strength increase of alumina foams by a sodium aluminosilicate glass coating with subsequent Na+ ↔ K+ ion exchange (gorilla glass coating)
Betke, Ulf; Zander, Phillip Viet Duc; Scheffler, Michael
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl., Bd. 26 (2024), Heft 18, Artikel 2400521, insges. 8 S.
Heat treatment, microstructure, hardness and corrosion resistance of martensitic stainless steel X65Cr13 (1.4037)
Rosemann, P.; Sieber, P.; Kukuk, L. D.; Roßberg, S.; Betke, Ulf; Hütter, Sebastian; Jakob, P.; Sehnert, K.
In: HTM - journal of heat treatment and materials - München : Hanser, Bd. 79 (2024), Heft 1, S. 15-34
2023
Peer-reviewed journal article
Effect of powder processing and sintering conditions on the microstructural, thermal, and mechanical properties of reticulated zinc oxide ceramic foams
Betke, Ulf; Scheffler, Michael
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl., Bd. 25 (2023), Heft 16, Artikel 2300459, insges. 13 S.
Increased microporosity in ceramic and metal foams - a novel processing combination
Dammler, Kathleen; Sutygina, Alina; Scheffler, Franziska; Scheffler, Michael; Betke, Ulf
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl., Bd. 26 (2024), Heft 4, Artikel 2300799, insges. 9 S.
Efficient sintering of Mo matrix composites - a study of temperature dependences and the use of the sinter additive Ni
Solodkyi, Ievgen; Petrusha, Vadym; Grigoroscuta, Mihai Alexandru; Schmelzer, Janett; Hasemann, Georg; Betke, Ulf; Badica, Petre; Krüger, Manja
In: Metals - Basel : MDPI, Bd. 13 (2023), Heft 10, Artikel 1715, insges. 15 S.
Damage analysis of retrieved Biolox® delta components used in hard and soft bearings
Döring, Joachim; Buchholz, Adrian; Herbster, Maria; Gehring, Jennifer; Betke, Ulf; Chodór, Paweł; Zabrzyński, Jan; Bertrand, Jessica; Lohmann, Christoph H.; Łapaj, Łukasz
In: Acta biomaterialia - [Amsterdam] : Elsevier, Bd. 158 (2023), S. 827-842
2022
Abstract
Analyse von Art und Schwere der Schäden an ZTA-Keramik-Hüftimplantaten
Döring, Joachim; Buchholz, Adrian; Herbster, Maria; Gehring, Jennifer; Betke, Ulf; Bertrand, Jessica; Lohmann, Christoph H.; Łapaj, Łukasz
In: 12. Kongress der Deutschen Gesellschaft für Biomechanik (DGfB) - Köln : Deutsche Gesellschaft für Biomechanik ; Potthast, Wolfgang *1967-* . - 2022, S. 202, Artikel P26 [Kongress: 12. Kongress der Deutschen Gesellschaft für Biomechanik (DGfB), Köln, 28.-30. September 2022]
Peer-reviewed journal article
Reticulated open-cellular aluminum nitride ceramic foams - effect of sintering aids on microstructural, thermal, and mechanical properties
Betke, Ulf; Mendoza, Danielle Chazaro; Scheffler, Michael
In: International journal of applied ceramic technology - Westerville, Ohio : Wiley-Blackwell . - 2022, insges. 9 S. [Online first]
Effect of the cell count on geometrical, mechanical, and thermal properties of hierarchical-porous reticulated copper foams from a combination of sponge replication and freeze-drying techniques
Sutygina, Alina; Betke, Ulf; Scheffler, Michael
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl., Bd. 24 (2022), Heft 10, Artikel 2200230, insges. 7 S.
Reticulated ceramic foams from alumina-chromia solid solutions - a feasibility study
Betke, Ulf; Schrake, Daniel; Scheffler, Michael
In: International journal of applied ceramic technology - Westerville, Ohio : Wiley-Blackwell, Bd. 19 (2022), Heft 1, S. 188-199
Manufacturing of open-cell aluminium foams - comparing the sponge replication technique and its combination with the freezing method
Sutygina, Alina; Betke, Ulf; Scheffler, Michael
In: Materials - Basel : MDPI, Bd. 15 (2022), Heft 6, Artikel 2147, insges. 14 S.
2021
Abstract
Biocompatibility of pure refractory metals and their combination as high entropy alloys
Schmelzer, Janett; Hasemann, Georg; Regenberg, Maximilian; Betke, Ulf; Krüger, Manja; Walles, Heike; Scheffler, Michael
In: Intermetallics 2021 - International Conference, 04-08 October 2021 : Educational Center Kloster Banz, Germany : programme and abstracts , 2021 - Jena, Germany : Conventus Congressmanagement & Marketing GmbH ; Krüger, Manja, S. 172-173, Artikel P-13 [Intermetallics 2021, International Conference, 4th till 8th October 2021 : Educational Center Kloster Banz, Germany]
Peer-reviewed journal article
Open-cellular alumina foams with hierarchical strut porosity by ice templating - a thickening agent study
Dammler, Kathleen; Schelm, Katja; Betke, Ulf; Fey, Tobias; Scheffler, Michael
In: Materials - Basel : MDPI - Volume 14(2021), issue 5, article 1060, 14 Seiten
Missing piece in the crystal chemistry of ZnSb secondary phases in ZnOSb2O3Bi2O3 varistor ceramics: orthorhombic β-Zn7Sb2O12 - an experimental and theoretical study of the crystal structure and its thermal and vibrational spectroscopic characterization
Betke, Ulf
In: Inorganic chemistry - Washington, DC : American Chemical Society, Bd. 60 (2021), Heft 12, S. 8640-8650
Refractory metal coated alumina foams as support material for stem cell and fibroblasts cultivation
Hasemann, Georg; Betke, Ulf; Krüger, Manja; Walles, Heike; Scheffler, Michael
In: Materials - Basel : MDPI, Bd. 14 (2021), Heft 11, Artikel 2813
Hierarchicalporous copper foams by a combination of sponge replication and freezing techniques
Sutygina, Alina; Betke, Ulf; Scheffler, Michael
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl., Bd. 24 (2022), Heft 1, Artikel 2001516, insges. 12 S.
2020
Abstract
Al2O3/Cu- und Cu-Retikulatschäume mit lamellar aufgebauten Stegen
Reissig, E.; Sutygina, Alina; Dammler, Kathleen; Schelm, Katja; Betke, Ulf; Scheffler, Michael
In: Zellulare Werkstoffe - DGM . - 2020 [14. Sitzung des DGM-Fachausschusses Zellulare Werkstoffe am 09.07.2020]
Peer-reviewed journal article
Open-cell aluminum foams by the sponge replication technique - a starting powder particle study
Sutygina, Alina; Betke, Ulf; Scheffler, Michael
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl., Bd. 22 (2020), Heft 5, S. 1-8, Artikel 1901194
Microstructure and compression properties of VSSV3B2 eutectic alloys in the V-Si-B system
Müller, Christopher; Hasemann, Georg; Regenberg, Maximilian; Betke, Ulf; Krüger, Manja
In: Materials - Basel : MDPI - Volume 13 (2020), issue 9, article 2100, 12 Seiten
High-perfomance doctor bladed thermoelectric microlayers
Künzel, Christian; Dammler, Kathleen; Betke, Ulf; Urbaschok, Jens; Scheffler, Franziska
In: Materials and design - Amsterdam [u.a.] : Elsevier Science - Volume 196 (2020), article 109087
Influence of Nb, Ti and Mo on microstructure and mechanical properties of vanadium solid solutions
Müller, Christopher; Touzani, Rachid S.; Betke, Ulf; Krüger, Manja
In: IOP conference series / Institute of Physics - London [u.a.] : Institute of Physics - Vol. 882 (2020), 012012, insgesamt 10 Seiten [ Symposium: Symposium on Materials and Joining Technology, Magdeburg, Germany, 7-8 September 2020]
Novel Al/Al2O3 composite foams by direct oxidation conversion
Chen, Xiadong; Sun, R.; Betke, Ulf; Scheffler, Michael
In: IOP conference series / Institute of Physics - London [u.a.] : Institute of Physics - Vol. 882 (2020), Paper 012003, insgesamt 11 Seiten [Symposium: Symposium on Materials and Joining Technology, Magdeburg, Germany, 7-8 September 2020]
Manufacturing of open-cell metal foams by the sponge replication technique
Sutygina, Alina; Betke, Ulf; Hasemann, Georg; Scheffler, Michael
In: IOP conference series / Institute of Physics - London [u.a.] : Institute of Physics - Vol. 882 (2020), Paper 012022, insgesamt 11 Seiten [Symposium: Symposium on Materials and Joining Technology, Magdeburg, Germany, 7-8 September 2020]
An in vitro hemodynamic loop model to investigate the hemocytocompatibility and host cell activation of vascular medical devices
Wacker, Max; Betke, Ulf; Borucki, Katrin; Hülsmann, Jörn; Awad, George; Varghese, Sam; Scherner, Maximilian Philipp; Hansen, Michael; Wippermann, Jens; Veluswamy, Priya
In: JoVE. Video journal - [S.l.] : [s.n.] - 2020, 162, article e61570, 21 Seiten
Cellular Nickel-Yttria/Zirconia (NiYSZ) cermet foams - manufacturing, microstructure and properties
Betke, Ulf; Schelm, Katja; Rodak, Andreas; Scheffler, Michael
In: Materials - Basel : MDPI - Volume 13 (2020), issue 11, article 2437, 14 Seiten
Phase Evolution, Filler-Matrix Interactions, and Piezoelectric Properties in Lead Zirconate Titanate (PZT)-Filled Polymer-Derived Ceramics (PDCs)
Eichhorn, Franziska; Kellermann, Simone; Betke, Ulf; Fey, Tobias
In: Materials - Basel : MDPI - Volume 13 (2020), issue 7, article 1520, 14 Seiten
2019
Peer-reviewed journal article
Tailoring of the wetting behavior of alumina dispersions on polymer foams by methylcellulose addition - a route toward mechanically stable ceramic replica foams
Schelm, Katja; Dammler, Kathleen; Betke, Ulf; Scheffler, Michael
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl., Bd. 21 (2019), Heft 12, Artikel 1900635
Open-cell aluminum foams by the sponge replication technique
Sutygina, Alina; Betke, Ulf; Scheffler, Michael
In: Materials - Basel : MDPI - Volume 12, issue 23 (2019), article 3840, insgesamt 12 Seiten
Reticulated open-celled zinc oxide ceramic foams - manufacturing, microstructure, mechanical, and thermal properties
Betke, Ulf; Scheffler, Michael
In: Advances in materials science and engineering - New York, NY : Hindawi - (2019), Article ID 6570180, insgesamt 10 Seiten
Hierarchicalporous ceramic foams by a combination of replica and freeze technique
Schelm, Katja; Fey, Tobias; Dammler, Kathleen; Betke, Ulf; Scheffler, Michael
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl. - Vol. 21 (2019), 6, Artikelnummer 1802362
Refitting of zirconia toughening into open-cellular alumina foams by infiltration with zirconyl nitrate
Betke, Ulf; Scheunemann, Marcel; Scheffler, Michael
In: Materials - Basel : MDPI - Volume12 (2019), Issue 12, Artikel 1886, insgesamt 23 Seiten
2018
Abstract
Freeze cast alumina foams with hierarchical strut porosit
Dammler, Kathleen; Schelm, Katja; Fey, Tobias; Betke, Ulf; Scheffler, Michael
In: CellMAT 2018 , 2018 - Sankt Augustin, Germany : Deutsche Gesellschaft für Materialkunde e.V./German Materials Society, c/o INVENTUM GmbH ; Scheffler, Michael [Kongress: 5th Cellular Materials, Bad Staffelstein, Bavaria (Germany), 24-26 October 2018]
Manufacturing of open-celled aluminum foams by the sponge replication technique
Sutygina, Alina; Betke, Ulf; Scheffler, Michael
In: CellMAT 2018 - Sankt Augustin, Germany : Deutsche Gesellschaft für Materialkunde e.V./German Materials Society, c/o INVENTUM GmbH ; Scheffler, Michael [Kongress: 5th Cellular Materials, Bad Staffelstein, Bavaria (Germany), 24-26 October 2018]
Peer-reviewed journal article
Micro-macroporous composite materials - preparation techniques and selected applications - a review
Betke, Ulf; Lieb, Alexandra
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl. - Vol. 20.2018, 9, Art. 1800252
Alloying effects in Mo-5X (X=Zr, Ti,V) Microstructural modifications and mechanical properties
Becker, Julia; Betke, Ulf; Wessel, Egbert; Krüger, Manja
In: Materials today - Amsterdam [u.a.] : Elsevier, Bd. 15 (2018), S. 314-321
Density reduction of Mo-Si-B alloys by vanadium alloying
Becker, Julia; Betke, Ulf; Hoffmeister, Michael; Krüger, Manja
In: JOM - New York, NY : Springer Science + Business Media, Bd. 70 (2018), Heft 11, S. 2574-2581
MOFs meet macropores - dynamic direct crystallization of the microporous aluminum isophthalate CAU-10 on reticulated open-cellular alumina foams
Betke, Ulf; Klaus, Michael; Eggebrecht, Jakob G.; Scheffler, Michael; Lieb, Alexandra
In: Microporous and mesoporous materials - Amsterdam [u.a.] : Elsevier, Bd. 265 (2018), S. 43-56
Non-peer-reviewed journal article
Funktionalisierungsstrategien für keramische Replika-Schäume
Betke, Ulf; Scheffler, Michael
In: Dialog - [Lampertheim] : IWV . - 2018, S. 46-52
2017
Book chapter
Ein nachhaltiger Baustein im Fundament unseres Energiehaus(halt)es - Wärmespeicherung und Wärmetransformation
Betke, Ulf; Lieb, Alexander; Rannabauer, Stefan; Scheffler, Franziska; Scheffler, Michael
In: 16. Sommerkurs Werkstoffe und Fügen - Magdeburg, 08. und 09. September 2017 , 2017 , korrigierte Auflage - Magdeburg : Universitätsbibliothek ; Mook, Gerhard, S. 31-38
Keramische Schäume - Herstellung und Funktionalisierung
Schelm, Katja; Dammler, Kathleen; Chen, X.; Betke, Ulf; Rannabauer, Stefan; Scheffler, Michael
In: 16. Sommerkurs Werkstoffe und Fügen - Magdeburg, 08. und 09. September 2017 , 2017 , korrigierte Auflage - Magdeburg : Universitätsbibliothek ; Mook, Gerhard, S. 207-216
Hochleistungskeramiken für nachhaltige Wärmespeicherung und Kälteerzeugung
Betke, Ulf; Lieb, Alexandra; Rannabauer, Stefan; Scheffler, Franziska; Scheffler, Michael
In: Hochleistungskeramik 2017 / Deutsche Gesellschaft für Materialkunde e. V. - Lampertheim : ALPHA Informationsgesellschaft mbH ; Deutsche Gesellschaft für Materialkunde e. V., S. 22-27
Peer-reviewed journal article
Polymer derived ceramics with β-eucryptite fillers - filler-matrix interactions
Fedorova, Anna; Betke, Ulf; Scheffler, Michael
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl., Bd. 19 (2017), Heft 6, Artikel 1700079
Increased mechanical stability and thermal conductivity of alumina reticulated porous ceramics (RPC) by nanoparticle infiltration processing
Rannabauer, Stefan; Söffker, Gerrit-Maximilian; Scheunemann, Marcel; Betke, Ulf; Scheffler, Michael
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl. - Vol. 19.2017, 10, Art. 1700211, insgesamt 9 S. [Special Issue: Cellular Materials]
Reticulated replica ceramic foams - processing, functionalization, and characterization
Fey, Tobias; Betke, Ulf; Rannabauer, Stefan; Scheffler, Michael
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl., Bd. 19 (2017), Heft 10, Artikel 1700369, insges. 15 S.
Improving the strength of ZTA foams with different strategies - immersion infiltration and recoating
Chen, Xiaodong; Betke, Ulf; Rannabauer, Stefan; Peters, Paul; Söffker, Gerrit; Scheffler, Michael
In: Materials - Basel : MDPI, Bd. 10 (2017), Heft 7, S. 735
Impact of slurry composition on properties of cellular alumina - a computed tomographic study
Betke, Ulf; Dalicho, Sebastian; Rannabauer, Stefan; Lieb, Alexandra; Scheffler, Franziska; Scheffler, Michael
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl., Bd. 19 (2017), Heft 10, Artikel 1700138
2016
Book chapter
Partikelverstärkte Kupferlegierungen - physikalischen Eigenschaften und Einsatzpotential als Elektrodenkappenwerkstoffe zum Widerstandsschweißen
Sherepenko, Oleksii; Jüttner, Sven; Betke, Ulf; Mathiszik, Christian; Zschetzsche, Jörg; Füssel, Uwe
In: Widerstandsschweißen / DVS-Sondertagung Widerstandsschweißen , 2016 , Die Vorträge wurden als Manuskript gedruckt - Düsseldorf : DVS Media GmbH, S. 151-158 - (DVS Berichte; 1682) [Kongress: 23. Sondertagung Widerstandsschweißen, Duisburg, 29. - 30. Juni 2016]
Peer-reviewed journal article
Micro-macroporous composite materials - SiC ceramic foams functionalized with the metal organic framework HKUST-1
Betke, Ulf; Proemmel, Steven; Eggebrecht, Jakob G.; Rannabauer, Stefan; Lieb, Alexandra; Scheffler, Michael; Scheffler, Franziska
In: Chemie - Ingenieur - Technik - Weinheim : Wiley-VCH Verl., Bd. 88 (2016), Heft 3, S. 264-273
A novel processing route for alumina/mullite-based refactory materials
Betke, Ulf; Reschke, Kirsten; Scheffler, Michael
In: Refractories worldforum - Baden-Baden : Göller, Bd. 8 (2016), Heft 2, S. 81-85
Manufacturing of reticulated open-cellular aluminum nitride ceramic foams from aqueous AlN suspensions
Betke, Ulf; Lieb, Alexandra; Scheffler, Franziska; Scheffler, Michael
In: Advanced engineering materials - Weinheim : Wiley-VCH Verl., Bd. 19 (2017), Heft 3, Artikel 1600660, insges. 8 S.
Silane functionalized open-celled ceramic foams as support structure in metal organic framework composite materials
Betke, Ulf; Proemmel, Steven; Rannabauer, Stefan; Lieb, Alexandra; Scheffler, Michael; Scheffler, Franziska
In: Microporous and mesoporous materials - Amsterdam [u.a.] : Elsevier, Bd. 239 (2016), S. 209-220
Manufacturing of an electrically conducting cellular Cu-SiC material by metal salt infiltration and chemical reduction (MESCAL)
Betke, Ulf; Sharma, Kashyapa S. K.; Rodak, Andreas; Rannabauer, Stefan; Lieb, Alexandra; Scheffler, Franziska; Scheffler, Michael
In: Materials letters - New York, NY [u.a.] : Elsevier, Bd. 185 (2016), S. 201-203
2015
Book chapter
Kohlenstoffnanoröhren auf geometrisch einfachen und komplexen Trägerstrukturen
Mantzel, Niko; Reissig, Eric; Betke, Ulf; Rannabauer, Stefan; Scheffler, Michael
In: Smart, effizient, mobil - 12. Magdeburger Maschinenbau-Tage ; 30. September und 1. Oktober 2015 , 2015 - Magdeburg : Otto-von-Guericke-Universität Magdeburg
2012
Peer-reviewed journal article
Oleum and sulfuric acid as reaction media - the actinide examples UO 2(S 2O 7)-lt (low temperature), UO 2(S 2O 7)-ht (high temperature), UO 2(HSO 4) 2, An(SO 4) 2 (An - Th, U), Th 4(HSO 4) 2(SO 4) 7 and Th(HSO 4) 2(SO 4)
Betke, Ulf; Wickleder, Mathias S.
In: European journal of inorganic chemistry - Weinheim : Wiley-VCH . - 2012, Heft 2, S. 306-317
The oxidation of ReCl 5 with oleum - synthesis and crystal structure of Re 2 O 4 Cl 4 (SO 4 )
Betke, Ulf; Wickleder, Mathias S.
In: Zeitschrift für anorganische und allgemeine Chemie - Weinheim : Wiley-VCH, Bd. 638 (2012), Heft 1, S. 45-48
2011
Peer-reviewed journal article
Methanesulfonates of high-valent metals - syntheses and structural features of MoO 2(CH 3SO 3) 2, UO 2(CH 3SO 3) 2, ReO 3(CH 3SO 3), VO(CH 3SO 3) 2, and V 2O 3(CH 3SO 3) 4 and their thermal decomposition under N 2 and O 2 atmosphere
Betke, Ulf; Neuschulz, Kai; Wickleder, Mathias S.
In: Chemistry - a European journal - Weinheim : Wiley-VCH, Bd. 17 (2011), Heft 45, S. 12784-12801
Oleum and sulfuric acid as reaction media - structural features and thermal behavior of RE 2[W 2O 3(SO 4) 6] (RE - Sm-Gd, Ho), RE 2Nb 2O 2(SO 4) 3[H(SO 4) 2] 2 (RE - Y, Ce-Nd, Sm-Er), Sm 2Nb 2O 2(SO 4) 5(S 2O 7), and M 2Nb 4O 5(SO 4) 8 (M - Bi, Eu)
Betke, Ulf; Wickleder, Mathias S.
In: European journal of inorganic chemistry - Weinheim : Wiley-VCH . - 2011, Heft 28, S. 4400-4413
Stabilizing low-valent refractory metals in a strongly oxidizing medium - the first molybdenum(V) sulfate-MoO(HSO 4)(SO 4)-from Mo(CO) 6 in Oleum
Betke, Ulf; Neuschulz, Kai; Wickleder, Mathias S.
In: Chemistry - a European journal. - Weinheim : Wiley-VCH, Bd. 17.2011, 31, S. 8538-8541
Sulfates of the refractory metals - crystal structure and thermal behavior of Nb 2 O 2 (SO 4 ) 3 , MoO 2 (SO 4 ), WO(SO 4 ) 2 , and Two Modifications of Re 2 O 5 (SO 4 ) 2
Betke, Ulf; Wickleder, Mathias S.
In: Inorganic chemistry - Washington, DC : American Chemical Society, Bd. 50 (2011), Heft 3, S. 858-872
ReO 2Cl(S 2O 7), a molecular disulfate
Betke, Ulf; Dononelli, Wilke; Klüner, Thorsten; Wickleder, Mathias S.
In: Angewandte Chemie / International edition - Weinheim: Wiley-VCH, Bd. 50 (2011), 51, S. 12361-12363
- Energy sources and energy storage (Ü) ( Link zur LV im LSF )
- Mikroskopie und Werkstoffcharakterisierung ( Link zur LV im LSF )
- Mikroskopie und Werkstoffcharakterisierung ( Link zur LV im LSF )
- Regenerative Energien - Funktion, Komponenten und Werkstoffe (Ü) ( Link zur LV im LSF )
- Renewable Energies - Materials, Components, Function ( Link zur LV im LSF )
- Resources and Recycling (Ex) ( Link zur LV im LSF )