Experimental investigation of passive/active oxidation behavior of SiC based ceramic thermal protection materials exposed to high enthalpy plasma

Sakraker, Isil; Asma, C. O.

doi:10.1016/j.jeurceramsoc.2012.09.002

Cited by 58 publications

(18 citation statements)

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“…Severe strength degradation is common after passive oxidation with formation of a crystalline scale . Severe degradation is also observed after active oxidation, which is a concern for SiC‐based CMCs used in hypersonic or nuclear applications . Suggested degradation mechanisms are stress corrosion cracking under load, unspecified damage developed during active oxidation, or decomposition of an SiOC glass second phase .…”

Section: Introductionmentioning

confidence: 99%

“…14,23 Severe degradation is also observed after active oxidation, [18][19][20]22,[23][24][25][26] which is a concern for SiC-based CMCs used in hypersonic or nuclear applications. [27][28][29][30] Suggested degradation mechanisms are stress corrosion cracking under load, 19 unspecified damage developed during active oxidation, 20,24 or decomposition of an SiOC glass second phase. 18,23,25,26 Active oxidation produces rough SiC fiber surfaces that have been characterized by SEM, but characterization by TEM that could specifically identify fine-scale microstructural changes is lacking.…”

Section: Introductionmentioning

confidence: 99%

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SiC fiber strength after low pO₂ oxidation

Hay

2017

J Am Ceram Soc

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Hi‐Nicalon™‐S SiC fiber was heat treated for 1 hour at 1300°C, 1400°C, and 1500°C in argon with pO2 of 3.7, 10, 20, 50, 100, and 200 ppm. Fiber strengths were measured by 30 single‐filament tensile tests. Fiber microstructure and surface morphology were characterized by TEM. Active oxidation occurred in all cases except at 1500°C with 200 ppm pO2, 1400°C with 100 ppm pO2 or higher, and 1300°C with 50 ppm pO2 or higher. When active oxidation did not occur, a glass SiO2 scale formed at 1300°C and 1400°C, and a cristobalite scale formed at 1500°C. The thickness of these scales was much larger than that predicted by linear dependence of oxidation rate on pO2. Fiber strengths were lowest after heat treatment at 1300°C and a pO2 of 3.7 ppm, 1400°C and a pO2 of 20 ppm, and 1500°C and a pO2 of 200 ppm. Active oxidation caused fiber surface roughening, but no obvious changes to the internal fiber microstructure. Decreased fiber strength correlated with increased fiber surface roughness, but roughness magnitudes were not large enough to explain the amount by which strength was degraded. Fiber strengths, surface roughness, scale thicknesses, and the passive‐active oxidation transition for SiC are compared with previous observations. Possible strength degradation mechanisms are discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

SiC fiber strength after low pO₂ oxidation

Hay

2017

J Am Ceram Soc

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“…To simulate these extreme conditions, special facilities such as arc jets are necessary. Most of the reported experience with arc jet testing has focused on HfB 2 and ZrB 2 and their composites with SiC (128,129). The main findings after relatively short exposure times of minutes at temperatures of up to 2,000 • C are ablation and erosion of the surface and a near surface layer zone that extends for 100 μm or more where the composite has been altered from the bulk microstructure.…”

Section: Arc Jet Exposurementioning

confidence: 99%

Surface Engineering of Mo-Base Alloys for Elevated-Temperature Environmental Resistance

Perepezko

2015

Annu. Rev. Mater. Res.

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The synthesis of robust coatings that provide protection against environmental attack at ultrahigh temperatures is a difficult challenge. To achieve this goal for Mo-base alloys, the fundamental concepts of reactive diffusion pathway analysis and kinetic biasing are used to design a multilayer Mo-Si-B-base coating with a phase sequencing that allows for structural and thermodynamic compatibility and an underlying diffusion barrier to maintain coating integrity. The coating design concepts have a general applicability. The coating structure evolution during high-temperature exposure facilitates a prolonged lifetime as well as self-healing capability. The borosilicide coatings that can be synthesized by a pack cementation process yield superior environmental resistance for Mo-base systems at temperatures up to at least 1,700 • C and can be adapted to apply to other refractory metal and ceramic systems. 9.1

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“…Particularly, the use of composites for high‐temperature heat shielding in aerospace applications has become essential in certain areas—as the nose, wings and fin leading edges of suborbital Reusable Launch Vehicles—where high reentry temperatures of 900°C–1200°C jointly with mechanical loads develop . Although C f /C and C f /SiC are the more promising materials for those zones, their rapid degradation in oxidizing atmospheres above 500°C makes mandatory their protection by means of ablative coatings . The major concerns regarding aerospace coatings include reducing weight, decreasing vulnerability to orbital debris, while keeping minimal thermal conductivity and high emissivity to ensure the maximum rejection of incoming convective heat through radiative heat transfer .…”

Section: Introductionmentioning

confidence: 99%

“…1,2 Although C f /C and C f /SiC are the more promising materials for those zones, their rapid degradation in oxidizing atmospheres above 500°C makes mandatory their protection by means of ablative coatings. [6][7][8][9] The major concerns regarding aerospace coatings include reducing weight, decreasing vulnerability to orbital debris, while keeping minimal thermal conductivity and high emissivity to ensure the maximum rejection of incoming convective heat through radiative heat transfer. 4 In that context, we see hybrid graphene/glass-ceramic coatings as very promising materials because of the exceptional properties of carbon allotropes as well as the heat resistance and self-healing capability of glass-ceramics.…”

Section: Introductionmentioning

confidence: 99%

Superior Performance of Ablative Glass Coatings Containing Graphene Nanosheets

et al. 2016

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Glass compositions in the Y2O3–Al2O3–SiO2 (YAS) system are envisaged as promising coatings for high‐temperature protection, in particular for the thermal protection systems (TPS) looked for aerospace applications. Recently, thermally sprayed YAS hybrid coatings containing a small amount of graphene nanoplateletes (GNPs) showed enhanced performance as compared to the blank YAS coating, demonstrated by the occurrence of unusual electrical conductivity for these glasses and the development of better mechanical compliance, both phenomena associated with the presence of GNPs. Nevertheless, a crucial issue is to demonstrate if these kinds of coatings would also have superior behavior under ablation conditions, particularly regarding the mentioned TPS applications. This work goes far beyond, exploring the ablative behavior of new YAS/GNPs coatings flame sprayed over SiC substrates. These essential tests were carried out under laboratory conditions, reaching limit temperatures of 1350°C while blowing gas. Results evidence that hybrid coatings having just 1.05 vol% GNPs show enhanced ablation resistance, actually withstanding up to 30 thermal cycles (between 200°C and 1350°C) without apparent damage. This satisfactory performance is linked to the benefits of the GNP additions, and fundamentally to the higher emissivity and the directional thermal conduction characteristics of the hybrid coatings—produced by the formation of a GNP network with a preferential surface parallel arrangement—that preclude the creation of hot spots and also hinder heat propagation toward the substrate; accordingly, coating degradation is constrained to the uppermost layer of these coatings.

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Experimental investigation of passive/active oxidation behavior of SiC based ceramic thermal protection materials exposed to high enthalpy plasma

Cited by 58 publications

References 18 publications

SiC fiber strength after low pO₂ oxidation

SiC fiber strength after low pO₂ oxidation

Surface Engineering of Mo-Base Alloys for Elevated-Temperature Environmental Resistance

Superior Performance of Ablative Glass Coatings Containing Graphene Nanosheets

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Experimental investigation of passive/active oxidation behavior of SiC based ceramic thermal protection materials exposed to high enthalpy plasma

Cited by 58 publications

References 18 publications

SiC fiber strength after low pO2 oxidation

SiC fiber strength after low pO2 oxidation

Surface Engineering of Mo-Base Alloys for Elevated-Temperature Environmental Resistance

Superior Performance of Ablative Glass Coatings Containing Graphene Nanosheets

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Product

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SiC fiber strength after low pO₂ oxidation

SiC fiber strength after low pO₂ oxidation