Oxide Fiber‐Coatings for Interface Control in Ceramic Composites

Kerans, Ronald J.; Hay, Randall S.; Boakye, Emmanuel E.; Keller, Kirsten M.; Mah, Tai‐Il; Parthasarathy, Triplicane A.; Cinibulk, Michael K.

doi:10.1002/3527605622.ch22

Cited by 26 publications

(37 citation statements)

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“…In fact, Hi Nicalon fibers are constituted by a polycarbosilane-derived amorphous/microcrystalline Si-C-O that suffers a degradation as it transforms to equilibrium products during exposure to high temperatures. 16 Concerning the overall densification mechanisms, the following considerations can be stated. On the basis of thermodynamic calculations 17 for the system Zr-B-Si-O-N, ZrB 2 and Si 3 N 4 phases cannot coexist under the process conditions.…”

Section: Microstructurementioning

confidence: 99%

Toughened ZrB2-based ceramics through SiC whisker or SiC chopped fiber additions

Silvestroni¹,

Sciti²,

Melandri³

et al. 2010

Journal of the European Ceramic Society

187

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Section: Microstructurementioning

confidence: 99%

Toughened ZrB2-based ceramics through SiC whisker or SiC chopped fiber additions

Silvestroni¹,

Sciti²,

Melandri³

et al. 2010

Journal of the European Ceramic Society

187

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“…(2). Each finite element was assigned a local E level depending on its through-thickness position, as measured by nanoindentation (Fig.…”

Section: Room Temperature Behaviormentioning

confidence: 99%

“…This drawback is suppressed in SiC/SiC composites, one of the most advanced forms of SiC-based materials. These materials result from the development of the last generation of small diameter fibers, chemical vapor infiltrated (CVI) matrix and interphase, the interlayer material responsible for the non-brittle behavior of these composites [1,2].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of monolithic CVD-SiC tubes

Drieux

Chollon

Jacques

et al. 2016

Journal of the European Ceramic Society

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International audience† The authors dedicate this article to the memory of our colleague P. Weisbecker who has recently passed away Abstract : The high open porosity of SiC/SiC composites is problematic for uses in advanced thermal or confinement systems. A strong and gas-tight SiC sheath would helpfully complete the composite structure. The aim of this work was to prepare and characterize long, free standing and high strength SiC tubes prepared through a rapid near net shape manufacturing process. The tubes were produced by continuous chemical vapor deposition (CVD) at atmospheric pressure using CH 3 SiHCl 2 /C 3 H 6 /H 2 mixtures. The composition, morphology and microstructure of the CVD-SiC tubes were analyzed in details. The Si/C ratio and crystalline state through wall thickness are related to the progress of gas phase reactions during continuous deposition. The silicon excess in the CVD-SiC coating can be reduced by preheating gases and adding C 3 H 6. C-ring specimens cut from the obtained tubes were submitted to compressive tests at room and high temperature to assess the failure properties and thermomechanical behavior

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“…This type of model is also employed in conjunction with the fiber pushout and pullout tests to evaluate the frictional characteristics and the strength/toughness of the interface. Mechanics analyses vary in complexity from shear lag (Greszczuk, 1969;Kerans et al 1989, Kerans andParthasarathy, 1991) to theory of elasticity solutions (Liang and Hutchinson, 1993), and from variational stress solutions (Pagano, 1991;Tandon and Pagano, 1996) to displacement-based finite element methods (Pochiraju et al, 1994(Pochiraju et al, , 1995. The inability of several of these methods to model the multivalued stress field at cracks and corners leads, at best, to approximate stress fields in these locations.…”

Section: Introductionmentioning

confidence: 98%

Extraction of singular stress fields using the axisymmetric single-fiber micromechanics model

Pochiraju

Tandon

2005

Int J Fract

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The stress distributions near the points of singularity in a single-fiber micromechanics model as obtained by local asymptotic methods and global (numerical solutions to full-field boundary value problem) methods are described. While the numerical/analytical solutions (without special treatment of the singularity) can capture higher order terms and are sufficiently accurate away from points of singularity, the solutions are approximate in the neighborhood of the singularity due to the inherent assumptions (single-valued at the point of singularity) about the nature of the stress fields. The study focuses on a methodology for accurate determination of generalized stress intensity factors from the "approximate" methods of stress analysis with relatively coarse discretizations and without any special modeling of the singularity. The approach adopted entails the comparison of the angular distribution of the stress components at varying radial distances near the point of singularity and identifying a region in which the numerical/analytical solutions have the best ability to determine the stress intensity factor. Determination of the generalized stress intensity factors is illustrated for a penny-shaped crack in a homogeneous medium and for a crack in fiber terminating at the fiber-matrix interface (fiber-break problem).

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Oxide Fiber‐Coatings for Interface Control in Ceramic Composites

Cited by 26 publications

References 0 publications

Toughened ZrB2-based ceramics through SiC whisker or SiC chopped fiber additions

Toughened ZrB2-based ceramics through SiC whisker or SiC chopped fiber additions

Synthesis and characterization of monolithic CVD-SiC tubes

Extraction of singular stress fields using the axisymmetric single-fiber micromechanics model

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