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  4. Thermal exposure effects on the long‐term behavior of a mullite fiber at high temperature
 
Zitierlink DOI
10.26092/elib/2628
Verlagslink DOI
10.1111/jace.14922

Thermal exposure effects on the long‐term behavior of a mullite fiber at high temperature

Veröffentlichungsdatum
2017-04-04
Autoren
Saint Martin Almeida, Renato  
Bergmüller, Eduardo L.  
Lührs, Hanna  
Wendschuh, Michael  
Clauß, Bernd  
Tushtev, Kamen  
Rezwan, Kurosch  
Zusammenfassung
The behavior of an oxide fiber at elevated temperatures was analyzed before and after thermal exposures. The material studied was a mullite fiber developed for high-temperature applications, CeraFib 75. Heat treatments were performed at temperatures ranging from 1200°C to 1400°C for 25 hours. Quantitative high-temperature X-ray analysis and creep tests at 1200°C were carried out to analyze the effect of previous heat treatment on the thermal stability of the fibers. The as-received fibers presented a metastable microstructure of mullite grains with traces of alumina. Starting at 1200°C, grain growth and phase transformations occurred, including the initial formation of mullite, followed by the dissociation of the previous alumina-rich mullite phase. The observed transformations are continuous and occur until the mullite phase reaches a state near the stoichiometric 3/2 mullite. Only the fibers previously heat treated at 1400°C did not show further changes when exposed again to 1200°C. Overall, the heat treatments increased the fiber stability and creep resistance but reduced the tensile strength. Changes observed in the creep strain vs. time curves of the fibers were related to the observed microstructural transformations. Based on these results, the chemical composition of the stable mullite fiber is suggested.
Schlagwörter
Creep

; 

Fibers

; 

Heat Treatment

; 

Microstructure

; 

Mullite

; 

Mimenima
Institution
Universität Bremen  
Fachbereich
Zentrale Wissenschaftliche Einrichtungen und Kooperationen  
Fachbereich 05: Geowissenschaften (FB 05)  
Institute
MAPEX Center for Materials and Processes  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Journal of the American Ceramic Society  
Band
100
Heft
9
Startseite
4101
Endseite
4109
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Lizenz
Alle Rechte vorbehalten
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

ALMEIDA - Thermal exposure effects_Deckblatt_pdfa1.pdf

Size

5.04 MB

Format

Adobe PDF

Checksum

(MD5):27f4c422aa866e817110d5aa9a0f6611

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