Mechanical Behavior and High‐Temperature Performance of a Woven Nicalon™/Si‐N‐C Ceramic‐Matrix Composite

Lee, S. Steven; Zawada, Larry P.; Staehler, James M.; Folsom, Craig A.

doi:10.1111/j.1151-2916.1998.tb02550.x

Cited by 52 publications

(21 citation statements)

References 39 publications

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“…Most SiCfiber-containing CMCs exhibit longer life under static loading and shorter life under cyclic loading [27]. For these materials, fatigue is significantly more damaging than creep.…”

Section: Introductionmentioning

confidence: 99%

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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“…Most SiCfiber-containing CMCs exhibit longer life under static loading and shorter life under cyclic loading [27]. For these materials, fatigue is significantly more damaging than creep.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2009

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“…Oxide‐oxide composites with porous matrix display behavior tendencies that are markedly different from those reported for the composites with dense SiC‐based matrices and an interface between fibers and matrix. Most SiC/SiC CMCs display longer lifetimes under sustained loads and shorter lifetimes when subjected to cyclic fatigue . For these composites, cyclic loading is substantially more detrimental than sustained loading.…”

Section: Introductionmentioning

confidence: 99%

Creep of a Nextel™720/alumina ceramic composite containing an array of small holes at 1200°C in air and in steam

Ruggles‐Wrenn

Minor

Przybyla

et al. 2018

Int J Applied Ceramic Tech

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Tensile stress‐strain and tensile creep behaviors of an oxide‐oxide composite containing an array of small circular holes were evaluated at 1200°C. The composite consists of Nextel™720 alumina‐mullite fibers in a porous alumina matrix. Test specimens contained an array of 17 holes with 0.5‐mm diameter drilled using a CO2 laser. The presence of holes caused reduction in tensile strength and modulus. Tensile creep tests were conducted at 1200°C in air and in steam at creep stresses ranging from 38 to 140 MPa. Primary, secondary, and tertiary creep regimes were noted in air and in steam. The presence of the laser‐drilled holes accelerates the steady‐state creep rates. Creep run‐out, defined as 100 hours at creep stress, was attained for stress levels <60 MPa in air and for stresses <40 MPa in steam. The presence of the laser‐drilled holes significantly degrades creep resistance of the composite. The retained tensile properties of all specimens that attained run‐out were determined. Composite microstructure was examined; the damage and failure mechanisms were considered. The degradation of tensile properties and creep resistance are attributed to damage caused to composite microstructure by laser drilling.

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“…This behavior is very similar to that observed by other authors and supports the suggestion that the initial creep occurs because of load-sharing effects, after which only marginal creep strain occurs. [24][25][26][27] It also implies that a damage mechanism controls the creep of C/C composites. After the saturation of matrixcracking in the first stage of creep, the creep of composite is controlled by a combination of the energy dissipative mechanisms like fiber debonding, fracture and pull-out of the fibers, matrix microcracking, etc.…”

Section: Resultsmentioning

confidence: 99%

High-temperature mechanical behavior of carbon–silicide–carbide composites developed by alloyed melt infiltration

Esfehanian

Guenster

Heinrich

et al. 2008

Journal of the European Ceramic Society

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Mechanical Behavior and High‐Temperature Performance of a Woven Nicalon™/Si‐N‐C Ceramic‐Matrix Composite

Cited by 52 publications

References 39 publications

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

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

Creep of a Nextel™720/alumina ceramic composite containing an array of small holes at 1200°C in air and in steam

High-temperature mechanical behavior of carbon–silicide–carbide composites developed by alloyed melt infiltration

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