Characterization and High‐Temperature Mechanical Behavior of an Oxide/Oxide Composite

Zawada, Larry P.; Hay, Randall S.; Lee, Shin S.; Staehler, James M.

doi:10.1111/j.1151-2916.2003.tb03406.x

Cited by 117 publications

(56 citation statements)

References 47 publications

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“…After the UTS is reached, appreciable inelastic strains develop at near constant stress. These observations are consistent with the results reported for the porousmatrix ceramic composites in the ±45°orientation [24,25]. The elastic modulus (46 GPa) and UTS (55 MPa) obtained for the ±45°orientation are considerably lower than the corresponding values for the 0°/90°specimens.…”

Section: Monotonic Tensionsupporting

confidence: 94%

Creep behavior of Nextel™720/alumina ceramic composite with ±45° fiber orientation at 1200°C

Ruggles‐Wrenn¹,

Siegert²,

Baek³

2008

Composites Science and Technology

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Section: Monotonic Tensionsupporting

confidence: 94%

Creep behavior of Nextel™720/alumina ceramic composite with ±45° fiber orientation at 1200°C

Ruggles‐Wrenn¹,

Siegert²,

Baek³

2008

Composites Science and Technology

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“…For these materials, fatigue is significantly more damaging than creep. Conversely, for porous-matrix oxide-oxide CMCs, creep is considerably more damaging than fatigue [28,29]. In addition, the prior studies [29,30] revealed that creep performance of the porous-matrix Nextel™720/alumina (N720/A) oxide-oxide composite deteriorates drastically in the presence of steam.…”

Section: Introductionmentioning

confidence: 96%

Effects of Steam Environment on Creep Behavior of Nextel™610/Monazite/Alumina Composite at 1,100°C

et al. 2009

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The tensile creep behavior of a N610™/LaPO 4 /Al 2 O 3 composite was investigated at 1,100°C in laboratory air and in steam. The composite consists of a porous alumina matrix reinforced with Nextel 610 fibers woven in an eight-harness satin weave fabric and coated with monazite. The tensile stress-strain behavior was investigated and the tensile properties measured at 1,100°C. The addition of monazite coating resulted in~33% improvement in ultimate tensile strength (UTS) at 1,100°C. Tensile creep behavior was examined for creep stresses in the 32-72 MPa range. Primary and secondary creep regimes were observed in all tests. Minimum creep rate was reached in all tests. In air, creep strains remained below 0.8% and creep strain rates approached 2×10 −8 s −1 . Creep run-out defined as 100 h at creep stress was achieved in all tests conducted in air. The presence of steam accelerated creep rates and significantly reduced creep lifetimes. In steam, creep strain reached 2.25%, and creep strain rate approached 2.6×10 −6 s −1 . In steam, creep run-out was not achieved. The retained strength and modulus of all specimens that achieved run-out were characterized. Comparison with results obtained for N610™/Al 2 O 3 (control) specimens revealed that the use of the monazite coating resulted in considerable improvement in creep resistance at 1,100°C both in air and in steam. Composite microstructure, as well as damage and failure mechanisms were investigated.

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“…Oxide–oxide CMCs exhibit damage tolerance combined with inherent oxidation resistance, and have good high‐temperature mechanical properties in air . However, recent studies show dramatic degradation of mechanical performance of oxide–oxide CMCs at elevated temperature in steam .…”

Section: Introductionmentioning

confidence: 99%

Creep of Nextel^™ 610 Fiber at 1100°C in Air and in Steam

Armani

Ruggles‐Wrenn

Fair

et al. 2012

Int J Applied Ceramic Tech

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Creep of Nextel™610 fibers was investigated at 1100°C and 100–500 MPa in air and in steam. The effect of loading rate on fiber tensile strength was also explored. The presence of steam accelerated creep and reduced fiber lifetimes. Loading rate had a considerable effect on tensile strength in steam, but not in air. A linear elastic crack growth model was used to predict the creep lifetimes from the constant loading rate data. The dependence of tensile strength on loading rate and the predictability of creep lifetimes suggest that the failure mechanism in steam was environmentally assisted subcritical crack growth. The creep‐rupture data were analyzed in terms of a Monkman‐Grant (MG) relationship. Monkman‐Grant parameters for creep‐rupture data were the same in steam and air, and predicted creep‐rupture at 1100°C in both environments. A grain‐size increase of about 25% was observed by TEM after 100 h at 1100°C in steam, which was about two times that observed in air.

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Characterization and High‐Temperature Mechanical Behavior of an Oxide/Oxide Composite

Cited by 117 publications

References 47 publications

Creep behavior of Nextel™720/alumina ceramic composite with ±45° fiber orientation at 1200°C

Creep behavior of Nextel™720/alumina ceramic composite with ±45° fiber orientation at 1200°C

Effects of Steam Environment on Creep Behavior of Nextel™610/Monazite/Alumina Composite at 1,100°C

Creep of Nextel^™ 610 Fiber at 1100°C in Air and in Steam

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Characterization and High‐Temperature Mechanical Behavior of an Oxide/Oxide Composite

Cited by 117 publications

References 47 publications

Creep behavior of Nextel™720/alumina ceramic composite with ±45° fiber orientation at 1200°C

Creep behavior of Nextel™720/alumina ceramic composite with ±45° fiber orientation at 1200°C

Effects of Steam Environment on Creep Behavior of Nextel™610/Monazite/Alumina Composite at 1,100°C

Creep of Nextel™ 610 Fiber at 1100°C in Air and in Steam

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Creep of Nextel^™ 610 Fiber at 1100°C in Air and in Steam