Synthesis and slurry spray coating of barium strontium alumino silicate on SiC substrate

Rao, R. Ramachandra; Dange, Enoos; Udayakumar, A.

doi:10.1016/j.ceramint.2020.06.311

Cited by 8 publications

(3 citation statements)

References 59 publications

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“…11,24 As an alternative to APS, low-cost slurry-based techniques like dip coating, electrophoretic deposition, and slurry spraying have been used for developing EBCs. [25][26][27] Electrophoretic deposition is although useful in depositing complex shape geometries it is limited in the coating thickness because of the slow deposition rate. 28 Nasiri et al 29 have reported fabrication by slurry-based reactive sintering, where dip coating was used to deposit Yb 2 O 3 on a pre-oxidized CMC substrate.…”

Section: Introductionmentioning

confidence: 99%

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Functionally multilayered Yb‐silicate EBCs fabricated using slurry spraying‐reactive sintering technique

Waghmare,

Hastak,

Gandhi

2024

J Am Ceram Soc.

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Functionally multilayered environmental barrier coatings (EBCs) with the desired layer sequence of Yb2O3/Yb2SiO5/Yb2Si2O7/SiO2/Si were obtained using an unconventional yet simple technique of reactive sintering. Yb2O3 slurry was sprayed on polycrystalline silicon (used as a bond coat for SiCf/SiC composites) and reactive sintered to generate graded layers that provide a combination of mitigated thermal expansion mismatch as well as silica activity. The Yb2O3‐terpineol slurry produced a uniform deposit of the Yb2O3 topcoat. Reactive sintering of exploratory coatings (t ∼ 10–20 µm) was carried out in air by varying the temperature (1100–1400°C) and time (2–24 h). X‐ray diffraction and scanning electron microscopy‐energy‐dispersive spectroscopy technique confirmed the in situ formation of X2‐Yb2SiO5 and β‐Yb2Si2O7. Rietveld refinement was performed to know the volume fractions of the respective phases. The set of process parameters identified from the preliminary work was employed to fabricate EBCs with thickness ∼ 250 µm. The X2‐Yb2SiO5 and β‐Yb2Si2O7 phases formed next to the Si/SiO2 interface as two separate layers. Post‐sintering heat treatments in air at 1300, 1350, and 1400°C for 3–50 h elucidated the growth characteristics of the oxide layers to be a function of both temperature and time. The theoretical considerations of diffusional reactive phase formation of the EBC multilayer growth rates are discussed.

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Section: Introductionmentioning

confidence: 99%

“…As an alternative to APS, low‐cost slurry‐based techniques like dip coating, electrophoretic deposition, and slurry spraying have been used for developing EBCs 25–27 . Electrophoretic deposition is although useful in depositing complex shape geometries it is limited in the coating thickness because of the slow deposition rate 28 .…”

Section: Introductionmentioning

confidence: 99%

Functionally multilayered Yb‐silicate EBCs fabricated using slurry spraying‐reactive sintering technique

Waghmare,

Hastak,

Gandhi

2024

J Am Ceram Soc.

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“…The preparation and stability of the slurry significantly influence the characteristics of spray coating; the dispersion of additives in the slurry is particularly impacted [11][12][13]. In recent years, the awareness of environmental protection has increased the use of biopolymer materials, such as cellulose [14][15][16], chitosan [17,18], and gelatin [19,20].…”

Section: Introductionmentioning

confidence: 99%

Surface Characterization and Tribological Behavior of Graphene-Reinforced Cellulose Composites Prepared by Large-Area Spray Coating on Flexible Substrate

et al. 2020

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A large-area spray coating process is introduced to efficiently apply a graphene/Cu/cellulose composite on a flexible glass substrate. The dispersion characteristics of nano-additives are measured and the Tyndall effect observed. The characteristics of the composite coating such as the film thickness, surface roughness, water contact angle, and lubricating characteristics are measured. The tribological properties of the composite coating are measured using a ball-on-disk. The wear width of the abrasive parts, as well as the wear and friction coefficient of the grinding balls, are investigated. Adding graphene/Cu helps to improve the anti-wear ability of cellulose. The transfer layer was observed using the Raman spectroscopy and mapping technology. Finally, the lubricating mechanism is discussed, and the wear mechanism is proposed. Nanoparticles existed in the wear track as the third-body particles and improved the load capacity of the composites. The wear mechanism of the composites is discussed in terms of the worn surfaces and the analysis of the transfer film with the third-body approach.

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High temperature ceramic radomes (HTCR) – A review

Nag

Rao

Panda

2021

Ceramics International

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Synthesis and slurry spray coating of barium strontium alumino silicate on SiC substrate

Cited by 8 publications

References 59 publications

Functionally multilayered Yb‐silicate EBCs fabricated using slurry spraying‐reactive sintering technique

Functionally multilayered Yb‐silicate EBCs fabricated using slurry spraying‐reactive sintering technique

Surface Characterization and Tribological Behavior of Graphene-Reinforced Cellulose Composites Prepared by Large-Area Spray Coating on Flexible Substrate

High temperature ceramic radomes (HTCR) – A review

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