Effect of microstructure and chemical composition on subcritical crack growth in SiC-based fiber tows

Mazerat, S.; Pailler, R.

doi:10.1016/j.ceramint.2020.09.052

Cited by 10 publications

(3 citation statements)

References 29 publications

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“…4 ). When oxygen free (Hi-Ni-S, Hi-Ni and ZE), a K IC larger than 1.2 MPa m 1/2 was calculated whereas this value is lower in presence of SiCO glassy phase (>5at.% O) [7] . Oxygen rich fibers can further be classified in two families.…”

Section: Data Descriptionmentioning

confidence: 91%

Dataset on fractographic analysis of various SiC-based fibers

Mazerat¹,

Pailler²

2021

Data in Brief

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Section: Data Descriptionmentioning

confidence: 91%

Dataset on fractographic analysis of various SiC-based fibers

Mazerat¹,

Pailler²

2021

Data in Brief

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“…As mentioned above, three different types of fibers were used for this work: Tyranno Grade S (UBE Industries Ltd.), Nicalon, and Hi‐Nicalon (NGS Advanced Fibers Co. Ltd.), respectively, named TS, NL, and HNL afterward. Their chemical composition and physical properties are gathered in Table 1 70–72 . Two types of oxidation tests were performed in ambient atmosphere (P H2O ranging from 0.35 to 1.35 KPa, averaging to 0.70 KPa at 22°C).…”

Section: Methodsmentioning

confidence: 99%

“…Their chemical composition and physical properties are gathered in Table 1. [70][71][72] Two types of oxidation tests were performed in ambient atmosphere (P H2O ranging from 0.35 to 1.35 KPa, averaging to 0.70 KPa at 22 • C). Static oxidation tests were conducted on 10 mm long multifilament tows placed on an alumina holder and pushed in the hot segment of a 2-zones resistive furnace beforehand heated.…”

Section: Methodsmentioning

confidence: 99%

Oxidation under stress of SiC‐based fibers at intermediate temperature and ambient air

Mazerat,

El‐Morsli,

Sarrazin

et al. 2024

J Am Ceram Soc.

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If the temperature and environment effects on the oxidation of SiC fibers have been extensively documented, the impact of external stresses (stress‐oxidation coupling effect) remains questioned. Therefore, interrupted static fatigue tests were conducted on filaments. Surviving specimens (>60%) were subsequently tensile tested and fracture surfaces recovered for analysis. The external stress was found to have no impact on the oxidation regime (linear or parabolic) nor on its rate, which is comparable to literature data. As long as the slow crack growth (SCG) incubates (negligible growth rate), the oxidation was shown to govern the embrittlement. Fracture surface analysis revealed tensile residual stresses, attributed to a wedge effect when specimens were unloaded. Rare tests (<2%) were interrupted while the crack had significantly grown highlighting the successive crack fronts. Sources of residual stresses and differences between fiber types (flaw position inducing a bias on lifetime prediction) are discussed. In these circumstances, a coupling effect between the oxidation embrittlement and the SCG could be assumed for moderate stress levels, which is pertinent for most of ceramic matrix composite applications.

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