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Cited by 112High-Temperature Coating BehaviorsSurface Modification and SuperhydrophobicitySurface Treatment and Coatings

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Molten‐Volcanic‐Ash‐Phobic Thermal Barrier Coating based on Biomimetic Structure

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Guo, Yiqian, Song, Wenjia, Guo, Lei, Li, Xinxin, He, Wenting, Yan, Xudong, Dingwell, Donald B., Guo, Hongbo·2023·Advanced Science
DOI 10.1002/advs.202205156PMC PMC10074056
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Abstract

Volcanic ash is a major threat to aviation safety. The softening/melting temperatures of volcanic ash lie far below typical aero‐engine operating temperatures. Thus, molten ash can accelerate the failure of thermal barrier coatings (TBCs). Here, inspired by natural superhydrophobic surfaces (e.g., the lotus leaf), a molten‐volcanic‐ash‐phobic TBC, which provides a large possibility to eliminate molten ash issues of TBCs, is developed. A hierarchically structured surface is first prepared on a (Gd 0.9 Yb 0.1)2 Zr 2 O 7 (GYbZ) pellet by ultrafast laser direct writing technology, aiming to confirm the feasibility of the biomimetic microstructure to repel molten volcanic ash wetting. Then biomimetic‐structured GYbZ TBCs are successfully fabricated using plasma spray physical vapor deposition, which reveals “silicate” phobicity at high temperatures. The exciting molten‐volcanic‐ash‐phobic attribute of the designed surfaces is attributed to the lotus‐leaf‐like dual‐scale microstructure, emulating in particular the existence of nanoparticles. These findings may be an important step toward the development of next‐generation aviation engines with greatly reduced vulnerability to environmental siliceous debris.

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Figure 1 Schematic illustration of CMAS mitigation strategy and fabrication of micro‐nanostructured CMAS‐phobic TBCs.
Figure 1 Schematic illustration of CMAS mitigation strategy and fabrication of micro‐nanostructured CMAS‐phobic TBCs.CC BY · PubMed Central
Figure 2 a) Optical images of as‐polished (left) and laser‐ablated (right) GYbZ bulks. The orange square shows the laser‐ablated area. b) SEM image of laser‐ablated GYbZ bulk with Δz = 60 µm. c) High magnification showing nanoparticles in laser‐ablated area. d) The 3D surface topography and corresponding 2D profile of laser‐ablated GYbZ bulk with Δz = 60 µm. The surface roughness is demonstrated by the Arithmetical mean height (S a). e) Characteristic geometrical parameters, FWHM, height, and H/W of laser‐ablated GYbZ bulks with different groove pitches. f) The ratio of nanoparticles of laser‐ablated GYbZ bulks with different groove pitches. g) Schematic of femtosecond laser ablation and deposition of nanoparticles.
Figure 2 a) Optical images of as‐polished (left) and laser‐ablated (right) GYbZ bulks. The orange square shows the laser‐ablated area. b) SEM image of laser‐ablated GYbZ bulk with Δz = 60 µm. c) High magnification showing nanoparticles in laser‐ablated area. d) The 3D surface topography and corresponding 2D profile of laser‐ablated GYbZ bulk with Δz = 60 µm. The surface roughness is demonstrated by the Arithmetical mean height (S a). e) Characteristic geometrical parameters, FWHM, height, and H/W of laser‐ablated GYbZ bulks with different groove pitches. f) The ratio of nanoparticles of laser‐ablated GYbZ bulks with different groove pitches. g) Schematic of femtosecond laser ablation and deposition of nanoparticles.CC BY · PubMed Central
Figure 3 Wetting properties of original and laser‐ablated GYbZ bulks. a) Hydrophilicity of original bulk and b) superhydrophobicity of femtosecond laser ablated bulk (∆z = 60 µm). Magnifications of interface between water droplet and solid surface (right). Variation of wettability at 1200 °C with dwelling time increasing: c,e) original GYbZ bulk and d,f) laser‐ablated GYbZ bulk (∆z = 60 µm). Actual photographs (left) and contact angles (right) of molten silicate droplet on c) original and d) laser‐ablated GYbZ bulk in furnace after heating to 1200 °C. Contact angles of molten silicate on e) original and f) laser‐ablated GYbZ bulk attacked with dwelling time of 300 s at 1200 °C.
Figure 3 Wetting properties of original and laser‐ablated GYbZ bulks. a) Hydrophilicity of original bulk and b) superhydrophobicity of femtosecond laser ablated bulk (∆z = 60 µm). Magnifications of interface between water droplet and solid surface (right). Variation of wettability at 1200 °C with dwelling time increasing: c,e) original GYbZ bulk and d,f) laser‐ablated GYbZ bulk (∆z = 60 µm). Actual photographs (left) and contact angles (right) of molten silicate droplet on c) original and d) laser‐ablated GYbZ bulk in furnace after heating to 1200 °C. Contact angles of molten silicate on e) original and f) laser‐ablated GYbZ bulk attacked with dwelling time of 300 s at 1200 °C.CC BY · PubMed Central
Figure 4 Wetting behavior of molten silicate on PS‐PVD GYbZ coating. a) Photograph of PS‐PVD plasma plume along with the axial direction. b) Surface morphology of PS‐PVD GYbZ coating sprayed at 1000 mm. c) Magnified nanoparticles on the surface of micropapilla in (b). d) Cross‐sectional SEM image of PS‐PVD GYbZ coating. e) Bright‐field TEM image of micropapillae encircled by yellow dash in (d). Electron diffraction pattern oriented along a [001]‐type zone axis confirming the presence of GYbZ fluorite phase within the dashed oval area (top right). f) Mean ratio of H/W (top) and contact angles of molten silicate on PS‐PVD coatings sprayed at different distance (bottom). g) Schematic of micro‐ and nanohierarchical structural coating performed by PS‐PVD. h) Photograph of silicate droplet of 2 mm onto the PS‐PVD coating at 1200 °C. Top right, contact angle of silicate droplet on the as‐sprayed coating.
Figure 4 Wetting behavior of molten silicate on PS‐PVD GYbZ coating. a) Photograph of PS‐PVD plasma plume along with the axial direction. b) Surface morphology of PS‐PVD GYbZ coating sprayed at 1000 mm. c) Magnified nanoparticles on the surface of micropapilla in (b). d) Cross‐sectional SEM image of PS‐PVD GYbZ coating. e) Bright‐field TEM image of micropapillae encircled by yellow dash in (d). Electron diffraction pattern oriented along a [001]‐type zone axis confirming the presence of GYbZ fluorite phase within the dashed oval area (top right). f) Mean ratio of H/W (top) and contact angles of molten silicate on PS‐PVD coatings sprayed at different distance (bottom). g) Schematic of micro‐ and nanohierarchical structural coating performed by PS‐PVD. h) Photograph of silicate droplet of 2 mm onto the PS‐PVD coating at 1200 °C. Top right, contact angle of silicate droplet on the as‐sprayed coating.CC BY · PubMed Central
Figure 5 a) Actual photographs of sample assembly before heating. b) Schematic diagram of geometrical evolution involving height, baseline length, and contact angle of silicate deposits at representative states during wetting process. c) Equilibrium contact angle and d) spreading process of molten silicate on polished GYbZ surface. e) Schematic diagram of molten silicate on micropapillae (with aspect ratio < 0.95). f) Schematic diagram of molten silicate on micropapillae (with aspect ratio > 1.25). g) Schematic diagram of silicate phobicity on micro/nanohierarchical structures.
Figure 5 a) Actual photographs of sample assembly before heating. b) Schematic diagram of geometrical evolution involving height, baseline length, and contact angle of silicate deposits at representative states during wetting process. c) Equilibrium contact angle and d) spreading process of molten silicate on polished GYbZ surface. e) Schematic diagram of molten silicate on micropapillae (with aspect ratio < 0.95). f) Schematic diagram of molten silicate on micropapillae (with aspect ratio > 1.25). g) Schematic diagram of silicate phobicity on micro/nanohierarchical structures.CC BY · PubMed Central

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Metadata

Authors
Guo, Y., Song, W., Guo, L., Li, X., He, W., Yan, X., Dingwell, D. B., & Guo, H.
Affiliations
  • Beihang University (CN)
  • Tianmushan Laboratory (CN)
  • Tianjin University (CN)
  • Ludwig-Maximilians-Universität München (DE)
Corresponding author
  • Song, Wenjia
  • Guo, Hongbo
ORCID
Venue
Advanced Science
Publisher
Wiley
Published
2023-02-02
Volume
10
Issue
10
Pages
e2205156-e2205156
ISSN
2198-3844 (ISSN-L)
DOI
10.1002/advs.202205156
PMC
PMC10074056
OpenAlex
W4318924034
Cited by
112
References
0
Citations by year
2026: 23 · 2025: 38 · 2024: 21 · 2023: 30
FWCI
13.62
Type
journal article
Language
en
Open access
Licence
Locations
  • Advanced Science (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Natural Science Foundation of China (52102057, U21B2052)
  • Natural Science Foundation of Zhejiang Province (LZ23E010003)
Topics
  • Physical Sciences › Materials Science › Surfaces, Coatings and Films › High-Temperature Coating Behaviors
  • Physical Sciences › Materials Science › Surfaces, Coatings and Films › Surface Modification and Superhydrophobicity
  • Physical Sciences › Engineering › Mechanical Engineering › Surface Treatment and Coatings
Keywords
thermal barrier coatings, biomimetic surfaces, lotus effect, superhydrophobic surfaces, hierarchical microstructure, plasma spray-physical vapor deposition

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