The Influence of Carbon on the Structure of Preceramic Polymer Derived SiC

Kolaya, L.E.; Lewis, N.

doi:10.1002/9780470294444.ch55

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…The crystallization rates may be significantly higher in the slurry-derived composite matrix than in the pure polymer-derived powders, because of the presence of both ␣-SiC seeds and C-fiber surfaces. Evidence for enhanced grain growth during crystallization of the AHPCS polymer adjacent to graphite surfaces has been seen in other work, 14 while epitaxial growth of ␤-SiC on ␣ seed grains has been observed in reaction-sintered materials formed by infiltration of compacts of ␣-SiC and carbon with molten silicon. 15 Assessment of the importance of such effects would require quantitative analysis by TEM.…”

Section: Resultssupporting

confidence: 62%

“…Evidence for enhanced grain growth during crystallization of the AHPCS polymer adjacent to graphite surfaces has been seen in other work, 14 while epitaxial growth of ␤-SiC on ␣ seed grains has been observed in reaction-sintered materials formed by infiltration of compacts of ␣-SiC and carbon with molten silicon. 15 Assessment of the importance of such effects would require quantitative analysis by TEM.…”

Section: Resultsmentioning

confidence: 89%

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Transverse Thermal Conductivity of Thin C/SiC Composites Fabricated by Slurry Infiltration and Pyrolysis

Berbon

Dietrich

Marshall

et al. 2001

Journal of the American Ceramic Society

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Thin C/SiC composites were fabricated by infiltrating a woven carbon fiber fabric with a slurry of SiC powder and polymer precursor for SiC, followed by heat treatment for pyrolysis. The effects of heat treatment parameters on the crystallization of the polymer-derived SiC, the composite microstructure, and the transverse thermal properties were assessed. Whereas composites heat-treated at 1000°C were crack-free and nearly fully dense, composites that were subjected to further multiple reinfiltration and heat treatment cycles at 1600°C developed porosity and cracking. However, the transverse thermal conductivity was increased significantly by the highertemperature heat treatment, to values higher than that of a composite with a chemical-vapor-infiltration SiC matrix and the same fiber reinforcement.

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Section: Resultssupporting

confidence: 62%

Section: Resultsmentioning

confidence: 89%

Transverse Thermal Conductivity of Thin C/SiC Composites Fabricated by Slurry Infiltration and Pyrolysis

Berbon

Dietrich

Marshall

et al. 2001

Journal of the American Ceramic Society

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“…3(b)) and the pyrolytic carbon coating was reduced in thickness to ϳ0.2 m, suggesting possible reaction between the pyrolytic carbon coating and the AHPCS-derived matrix during the 1600°C treatment. 7 Although coating fracture was not directly observed within the limited area of TEM specimens, cracking and fracture of the coating at some places are expected to accommodate the circumferential strain as the coating debonded from the fiber. The large loss in strength of the polymerderived composite after the one cycle of 1600°C treatment may be correlated to the loss of effectiveness of the coating in protecting fibers from the environment and in promoting damage-tolerating behavior in the composite.…”

Section: Resultsmentioning

confidence: 99%

Effect of 1600°C Heat Treatment on C/SiC Composites Fabricated by Polymer Infiltration and Pyrolysis with Allylhydridopolycarbosilane

Berbon

Calabrese

2002

Journal of the American Ceramic Society

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Fiber‐coating debonding observed by transmission electron microscopy is suggested as the cause for an ∼60% reduction in strength after one cycle of 1600°C heat treatment in a carbon/silicon carbide (C/SiC) composite fabricated by polymer infiltration and pyrolysis with pure allylhydridopolycarbosilane polymer as the matrix precursor. Infiltration with a slurry of SiC powder and the polymer precursor was effective in preserving the coating integrity and composite strength. This study demonstrates that the addition of powder in polymer infiltration and pyrolysis process may impact composite mechanical properties significantly by altering the fiber‐matrix interface characteristics.

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Review of testing methods to inform materials selection in high‐temperature structural applications

Rossi,

Hilmas,

Josken

et al. 2024

Int J Applied Ceramic Tech

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Careful material selection is paramount to meet the significant challenges posed by harsh environments in advanced applications. Ceramic matrix composites (CMCs) have come to the forefront of consideration for many of these applications where environmental resistance needs to be combined with structural stability at high temperatures (1200°C+). Many gaps exist in understanding how material variations pose unique material and design challenges that affect the final performance in a particular application. Thorough materials testing at relevant temperatures is required for various candidate materials to realize an analytical approach to materials selection. This review will discuss mechanical and environmental tests and their use at high temperatures including tensile tests, flexure tests, lifetime testing methods, interlaminar tests, and environmentally relevant tests. Challenges for performing these tests at high temperatures and on CMCs will be discussed. A literature review will provide examples of state‐of‐the‐art testing, and the test results from historical work and improvement opportunities will be addressed. This review aims to provide an overview of the current capabilities and practices for high‐temperature testing and recommend best practices for performing high‐temperature tests and interpreting and sharing the results and metadata with the larger community to expand the CMC material property database.

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The Influence of Carbon on the Structure of Preceramic Polymer Derived SiC

Cited by 3 publications

References 1 publication

Transverse Thermal Conductivity of Thin C/SiC Composites Fabricated by Slurry Infiltration and Pyrolysis

Transverse Thermal Conductivity of Thin C/SiC Composites Fabricated by Slurry Infiltration and Pyrolysis

Effect of 1600°C Heat Treatment on C/SiC Composites Fabricated by Polymer Infiltration and Pyrolysis with Allylhydridopolycarbosilane

Review of testing methods to inform materials selection in high‐temperature structural applications

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