SiC and Si3N4 recession due to SiO2 scale volatility under combustor conditions

Smialek, James L.; Robinson, R. Craig; Opila, Elizabeth J.; Fox, Dennis S.; Jacobson, Nathan

doi:10.1163/156855199x00056

Cited by 160 publications

(115 citation statements)

References 4 publications

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“…Ideally, this should show a parabolic (or cubic for the case of Ti 2 AlC) initial growth behavior, pass through a maximum, then approach a constant linear rate of weight decrease. This behavior has been demonstrated for SiC and Si 3 N 4 [5,6,34]. However, the burner rig data in the present study does not show a maximum and appears to follow cubic kinetics for the full 50 h, albeit at a rate less than that provided by static dry TGA tests.…”

Section: Volatility Rates and Cubic-linear Behaviorsupporting

confidence: 61%

“…The method for estimating the volatility rate follows that presented by Opila, et al [5,4,34] based on transport phenomena [35,36]. Fluid flow transport equations describe the diffusive flux (of the volatile species) from a flat plate into a moving boundary layer.…”

Section: Appendix a : Estimates Of Scale Volatility And Recession Ratesmentioning

confidence: 99%

“…A number of test techniques have evolved to study the phenomenon, including standard furnace thermogravimetric (TGA) and steam-jet [3,4]. Early demonstrations also used high pressure burner rigs where jet fuel was combusted and projected at high velocity over SiC and Si 3 N 4 based samples [5][6][7][8], as well as a turbine combustor demonstration test [9]. SiO 2 scale volatility issues have since achieved a level of prominence.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Environmental resistance of a Ti2AlC-type MAX phase in a high pressure burner rig

Smialek

2017

Journal of the European Ceramic Society

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Section: Volatility Rates and Cubic-linear Behaviorsupporting

confidence: 61%

Section: Appendix a : Estimates Of Scale Volatility And Recession Ratesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Environmental resistance of a Ti2AlC-type MAX phase in a high pressure burner rig

Smialek

2017

Journal of the European Ceramic Society

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“…Ironically, although the understanding between processing, phase equilibria and properties have lead to significant improvements in its high temperature mechanical properties, one major problem, only recognized within recent years, is the physical recession 54 Both of these reactions were well know, 55 but the significance of the second Eq. 3 was not recognized until real engine testing at ŋ1200c C resulted in weight and dimensional changes of the SiN and SiC components.…”

Section: Discussionmentioning

confidence: 99%

The Sophistication of Ceramic Science Through Silicon Nitride Studies

Lange

2006

J. Ceram. Soc. Japan

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The historical understanding of polyphase silicon nitride, abbreviated throughout as SiN, has been a multidisciplinary effort that contributed to the sophistication of Ceramic Science over the last 50 years. This understanding and the development of SiN leading to significantly improved properties has been linked by uncovering relations between phase equilibrium, processing science, microstructural development and properties. The understanding of how to represent phase relations between Si 3 N 4 , other phases, eutectics and other important constituents in different Si-N-O-M systems was pioneered by G äunter Petzow, his students, post-docs and co-workers at the Max-Planck-Institut fur Metallforschung in St äuttgart. It will be seen that this representation was one key to unlock the understanding of SiN properties as related to composition and its development into one of the modern ceramics of today. Major events and discoveries concerning these silicon nitride materials will be reviewed with reference major contributors to its science and technology.

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“…An enhanced recession rate of the CMCs in high pressure and high gas velocity combustion atmospheres reveals the requirement of protective environmental barrier coatings (EBCs) for their long-term use under these conditions [7][8][9]. The establishment of environmentally stable (i) and well-adhering coatings on the CMC substrate (ii) that have a chemical compatibility within the layers (iii), and that develop minor stresses as a result of thermal expansion mismatch and phase transformations etc; (iv) are desired for this purpose [10].…”

Section: Introductionmentioning

confidence: 99%

Application of High-Velocity Oxygen-Fuel (HVOF) Spraying to the Fabrication of Yb-Silicate Environmental Barrier Coatings

et al. 2017

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From the literature, it is known that due to their glass formation tendency, it is not possible to deposit fully-crystalline silicate coatings when the conventional atmospheric plasma spraying (APS) process is employed. In APS, rapid quenching of the sprayed material on the substrate facilitates the amorphous deposit formation, which shrinks when exposed to heat and forms pores and/or cracks. This paper explores the feasibility of using a high-velocity oxygen-fuel (HVOF) process for the cost-effective fabrication of dense, stoichiometric, and crystalline Yb 2 Si 2 O 7 environmental barrier coatings. We report our findings on the HVOF process optimization and its resultant influence on the microstructure development and crystallinity of the Yb 2 Si 2 O 7 coatings. The results reveal that partially crystalline, dense, and vertical crack-free EBCs can be produced by the HVOF technique. However, the furnace thermal cycling results revealed that the bonding of the Yb 2 Si 2 O 7 layer to the Silicon bond coat needs to be improved.

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SiC and Si3N4 recession due to SiO2 scale volatility under combustor conditions

Cited by 160 publications

References 4 publications

Environmental resistance of a Ti2AlC-type MAX phase in a high pressure burner rig

Environmental resistance of a Ti2AlC-type MAX phase in a high pressure burner rig

The Sophistication of Ceramic Science Through Silicon Nitride Studies

Application of High-Velocity Oxygen-Fuel (HVOF) Spraying to the Fabrication of Yb-Silicate Environmental Barrier Coatings

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