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Unraveling the hardening mechanism during laser-induced slip casting of lithium aluminate-microsilica slurry
- Additive manufacturing (AM) of alkali-activated materials is a promising method for producing ceramic precursors, construction elements and other parts. A recently introduced AM process is laser-induced slip casting of lithium aluminate/microsilica slurries, which yields parts with excellent mechanical strengths. To clarify the underlying mechanisms, μ-Raman spectroscopy was applied to parts produced by the process, and the dissolution and hydration of lithium aluminate was studied inter alia using conventional and in-situ X-ray diffraction. The results show that significant dissolution of lithium aluminate occurs, particularly at increased temperatures during laser interaction, which leads to an increase of pH and precipitation of an akopovaite-like Li-Al-CO3 layered double hydroxide. The increase of the pH is likely to induce dissolution of the microsilica and possibly formation of a hydrous lithium aluminosilicate gel. These observations explain the strength evolution of the studiedAdditive manufacturing (AM) of alkali-activated materials is a promising method for producing ceramic precursors, construction elements and other parts. A recently introduced AM process is laser-induced slip casting of lithium aluminate/microsilica slurries, which yields parts with excellent mechanical strengths. To clarify the underlying mechanisms, μ-Raman spectroscopy was applied to parts produced by the process, and the dissolution and hydration of lithium aluminate was studied inter alia using conventional and in-situ X-ray diffraction. The results show that significant dissolution of lithium aluminate occurs, particularly at increased temperatures during laser interaction, which leads to an increase of pH and precipitation of an akopovaite-like Li-Al-CO3 layered double hydroxide. The increase of the pH is likely to induce dissolution of the microsilica and possibly formation of a hydrous lithium aluminosilicate gel. These observations explain the strength evolution of the studied parts and can also aid the development and improvement of related AM methods.…
Autor*innen: | Sebastian SimonORCiD, Gregor GluthORCiD |
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Persönliche Herausgeber*innen: | S. Rossignol, Gregor GluthORCiD |
Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Open Ceramics |
Jahr der Erstveröffentlichung: | 2021 |
Organisationseinheit der BAM: | 7 Bauwerkssicherheit |
7 Bauwerkssicherheit / 7.4 Baustofftechnologie | |
Veröffentlichende Institution: | Bundesanstalt für Materialforschung und -prüfung (BAM) |
Herausgeber (Institution): | European Ceramic Society |
Verlag: | Elsevier |
Verlagsort: | Amsterdam |
Jahrgang/Band: | 5 |
Ausgabe/Heft: | Special issue: Alkali-activated materials and geopolymers in ceramics and beyond |
Aufsatznummer: | 100060 |
Erste Seite: | 1 |
Letzte Seite: | 7 |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
Freie Schlagwörter: | Additive manufacturing; Alkali-activated materials; Laser-induced slip casting; Layered double hydroxide; Lithium |
Themenfelder/Aktivitätsfelder der BAM: | Material |
Material / Additive Fertigung | |
DOI: | 10.1016/j.oceram.2021.100060 |
URN: | urn:nbn:de:kobv:b43-520557 |
ISSN: | 2666-5395 |
Zugehöriger Identifikator: | https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/51984 |
Verfügbarkeit des Dokuments: | Datei für die Öffentlichkeit verfügbar ("Open Access") |
Lizenz (Deutsch): | Creative Commons - CC BY - Namensnennung 4.0 International |
Datum der Freischaltung: | 01.02.2021 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 10.07.2024 |
Schriftenreihen ohne Nummerierung: | Wissenschaftliche Artikel der BAM |