Aluminium acetate as alternative cross-linker for temperature controlled gel-casting and joining of ceramics
Veröffentlichungsdatum
2016-01-15
Zusammenfassung
In an earlier established gel-casting process, the biopolymer alginate is cross-linked with Ca2+-ions released through the temperature controlled dissolution of calcium iodate-particles (Ca(IO3)2). In this study, aluminum acetate (AlAc) is compared to Ca(IO3)2 as an alternative temperature controlled cross-linker for an alginate–alumina slurry. Both cross-linkers are characterized regarding gel-forming properties, resulting microstructure, impurities, mechanics of sintered parts and the ability of joining ceramic blocks in the green state via connecting gelation with and without adding slurry. Rheological measurements show that both cross-linker have a similar gelling behavior and lead to gelled blocks of high quality. AlAc-particle create a denser and more homogenous microstructure, while Ca(IO3)2-particles induce pores, abnormal grain growth and lower mechanical values. Nevertheless Ca(IO3)2 shows excellent joining properties which makes it a suitable alternative to pressure joining. In summary, AlAc is an excellent alternative cross-linker but Ca(IO3)2 remains the method of choice for joining gelled bodies.
Schlagwörter
Gel-casting
;
Ceramic joining
;
Ionotropic gelation
;
Gel-forming rheology
;
Microstructure
;
Mimenima
Verlag
Elsevier
Institution
Institute
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Band
36
Heft
5
Startseite
1241
Endseite
1251
Seitenzahl
11
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Sprache
Englisch
Dateien![Vorschaubild]()
Lade...
Name
C. Brandes, M. Hoog Antink, S. Kroll, L. Treccani, K. Rezwan, Aluminium acetate as alternative cross-linker_ 2016_accepted version.pdf
Size
3.33 MB
Format
Adobe PDF
Checksum
(MD5):317c3f43753783fdd9abcb4b627845df