Tensile and creep performance of a novel mullite fiber at high temperatures

Almeida, Renato S.M.; Tushtev, Kamen; Clauß, Bernd; Grathwohl, Georg; Rezwan, Kurosch

doi:10.1016/j.compositesa.2015.05.013

Cited by 37 publications

(21 citation statements)

References 32 publications

(40 reference statements)

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“…For a better comparison, Figure shows the minimum creep rates measured for the fibers under different applied stresses. The values of the as‐received Nextel 720 fibers are also given, since this oxide fiber is credited to have the highest creep resistance. The low creep rates of Nextel 720 are a result of its microstructure of 0.5 μm mosaic mullite grains .…”

Section: Discussionmentioning

confidence: 99%

“…Minimum creep rate vs applied stress for the as‐received CeraFib 75 fibers and the fibers after heat treatment for 25 hours at temperatures of 1200°C‐1400°C. Data for the as‐received Nextel 720 were included for comparison…”

Section: Discussionmentioning

confidence: 99%

“…The fiber exhibits a microstructure of mullite grains with traces of γ‐alumina. Further details/properties of the fiber have been published elsewhere . For the methodology described below, fibers were tested before (as‐received) and after heat treatment for 25 hours at temperatures of 1200°C (HT 1200), 1300°C (HT 1300) and 1400°C (HT 1400).…”

Section: Methodsmentioning

confidence: 99%

“…The samples were tested until failure or until reaching the run‐out time of 50 hours. This run‐out time was chosen based on previous studies, as the fibers reach the secondary creep stage within this time . Three different weights were used to apply different creep loads.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the Institute of Textile Chemistry and Chemical Fibers (ITCF, Denkendorf, Germany), together with the German company CeraFib GmbH (Olbersdorf, Germany), has produced the nearly pure mullite fiber CeraFib 75. At the current state of development, this fiber shows a lower room‐temperature strength than Nextel 720 but higher strength retention at temperatures above 1200°C …”

Section: Introductionmentioning

confidence: 92%

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

et al. 2017

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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.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

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