Creep in Interlaminar Shear of a Nextel<sup>™</sup>720/aluminosilicate Composite at 1100°C in Air and in Steam

Ruggles‐Wrenn, M. B.; Hilburn, Skyler

doi:10.1111/ijac.12357

Cited by 7 publications

(3 citation statements)

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“…For example, CMCs that contain Nextel™ 610 fibers (alumina) have higher creep rates and shorter creep rupture times in steam . CMCs that contain Nextel™ 720 fibers (alumina‐mullite) have higher creep rates and shorter creep rupture times in steam and in argon . Mechanical property degradation is due to the effects of steam on oxide fibers.…”

Section: Introductionmentioning

confidence: 99%

“…13 CMCs that contain Nextel TM 720 fibers (alumina-mullite) have higher creep rates and shorter creep rupture times in steam and in argon. [14][15][16][17] Mechanical property degradation is due to the effects of steam on oxide fibers. Creep and creep rupture rates are higher for Nextel TM 610 fibers in steam than in air, and fiber grain growth rates are higher.…”

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confidence: 99%

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Degradation of Nextel™ 610‐based oxide‐oxide ceramic composites by aluminum oxychloride decomposition products

et al. 2018

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Nextel™ 610 alumina fibers and alumina‐YAG (yttrium‐aluminum garnet) matrices were used to make oxide‐oxide ceramic matrix composites (CMCs) with and without monazite (LaPO4) fiber‐matrix interfaces. Twelve sequential aluminum oxychloride (AlOCl) infiltrations with 1 hour heat treatments at 1100°C and a final 1 hour heat treatment at 1200°C were used for matrix densification. This matrix processing sequence severely degraded CMC mechanical properties. CMC tensile strengths and interlaminar tensile (ILT) strengths were less than 10 MPa and 1 MPa, respectively. Axial fracture of Nextel™ 610 fibers was observed after ILT testing, highlighting the extreme degradation of fiber strength. Extensive characterization was done to attempt to determine the responsible degradation mechanisms. Changes in Nextel™ 610 fiber microstructure after CMC processing were characterized by optical microscopy, SEM, and extensively by TEM. In AlOCl degraded fibers, grain boundaries near the fiber surface were wetted with a glass that contained Y2O3/SiO2 or Y2O3/La2O3/P2O5/SiO2, and near‐surface pores were partially filled with Al2O3. This glass must also contain some Al2O3 and initially some chlorine. AlOCl decomposition products were predicted using the FactSage® Thermochemical code, and were characterized by mass spectrometry. Effects of AlOCl precursors on monazite coated and uncoated Nextel™ 610 fibers tow and filament strength were evaluated. A mechanism for the severe degradation of the oxide‐oxide CMCs and Nextel™ 610 fibers that involves subcritical crack growth promoted by release of chlorine containing species during breakdown of intergranular glasses in an anhydrous environment is proposed.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Degradation of Nextel™ 610‐based oxide‐oxide ceramic composites by aluminum oxychloride decomposition products

et al. 2018

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“…All experimental data reported by Choi and co-workers were obtained at elevated temperature in air. Recently, Ruggles-Wrenn et al [33][34][35] studied creep behavior in interlaminar shear of oxide/oxides composite and of a CVI Hi-Nicalon TM / SiC-B 4 C CMC at 1200 C in air and in steam. While the creep lifetimes of the oxide/oxide CMCs were drastically reduced in the presence of steam, the creep lifetimes of the SiC/SiC composite were only moderately affected by steam.…”

Section: Introductionmentioning

confidence: 99%

Creep in interlaminar shear of an Hi-Nicalon™/SiC–B₄C composite at 1300℃ in air and in steam

Ruggles‐Wrenn

Wallis

2019

Journal of Composite Materials

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Creep behavior in interlaminar shear of an advanced SiC/SiC composite with a self-healing matrix was investigated at 1300℃ in laboratory air and in steam. The composite was processed via chemical vapor infiltration (CVI). The composite has a self-healing oxidation-inhibited matrix comprising alternating layers of silicon carbide and boron carbide and is reinforced with laminated woven Hi-Nicalon™ fibers. Fiber preforms were coated with pyrolytic carbon followed by a boron carbon overlay. The interlaminar shear properties were evaluated at 1300℃. The creep behavior was examined for interlaminar shear stresses ranging from 13 to 20 MPa in air and in steam. Primary and secondary creep regimes were observed in all tests conducted in air and in steam. Creep run-out (defined as 100 h at creep stress) was achieved at 13 MPa in air and in steam. Presence of steam had little influence on creep strain rates and creep lifetimes. However, larger creep strains were accumulated in steam than in air. The retained properties of all specimens that achieved creep run-out were characterized. Composite microstructure and damage and failure mechanisms were investigated.

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Failure of Ceramic Composites

Parthasarathy¹,

Kerans²

2016

Reference Module in Materials Science and Materials Engineering

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Creep in Interlaminar Shear of a Nextel^™720/aluminosilicate Composite at 1100°C in Air and in Steam

Cited by 7 publications

References 40 publications

Degradation of Nextel™ 610‐based oxide‐oxide ceramic composites by aluminum oxychloride decomposition products

Degradation of Nextel™ 610‐based oxide‐oxide ceramic composites by aluminum oxychloride decomposition products

Creep in interlaminar shear of an Hi-Nicalon™/SiC–B₄C composite at 1300℃ in air and in steam

Failure of Ceramic Composites

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Creep in Interlaminar Shear of a Nextel™720/aluminosilicate Composite at 1100°C in Air and in Steam

Cited by 7 publications

References 40 publications

Degradation of Nextel™ 610‐based oxide‐oxide ceramic composites by aluminum oxychloride decomposition products

Degradation of Nextel™ 610‐based oxide‐oxide ceramic composites by aluminum oxychloride decomposition products

Creep in interlaminar shear of an Hi-Nicalon™/SiC–B4C composite at 1300℃ in air and in steam

Failure of Ceramic Composites

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Creep in Interlaminar Shear of a Nextel^™720/aluminosilicate Composite at 1100°C in Air and in Steam

Creep in interlaminar shear of an Hi-Nicalon™/SiC–B₄C composite at 1300℃ in air and in steam