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Development and Characterization of Photocatalytic GaN Coatings by Cold Spray Process
- Source :
- Journal of Thermal Spray Technology, Journal of Thermal Spray Technology, ASM International/Springer, In press, ⟨10.1007/s11666-021-01207-w⟩
- Publication Year :
- 2021
- Publisher :
- HAL CCSD, 2021.
-
Abstract
- International audience; For the first time, the low-pressure cold spray (LPCS) process was used to manufacture Gallium Nitride (GaN) films to enhance its photocatalytic properties and decrease its manufacturing cost. The deposition behavior of the GaN powder on stainless steel substrates was investigated. Several specimens, with sparsely deposited agglomerated GaN particles, were prepared under different spray conditions. Quantitative analysis of the evolution of the coverage area, deposited particle count, and average sectional area shows that, upon impact, agglomerated GaN particles disintegrate, leading to large deposition of small particles. By analyzing the cross-sectional area of the deposited 2 particle, no discernible permanent deformation of the substrate was observed. In addition, X-ray diffraction analysis of the coatings and powder indicated that no phase transformation occurred during the process. Based on Williamson-Hall analysis, the broader peaks of the coatings were mainly attributed to the distortions in the GaN lattice rather than changes in the crystallite size. At 400°C and 0.6 MPa, the deposition efficiency reached 5.3%, and the photocatalytic activities of the coating were about 33% (+9% compared to the powder). It is attributed to the higher specific surface area and roughness that the coatings exhibit after the breakage of the particles during the cold spray.
- Subjects :
- Materials science
Gas dynamic cold spray
Gallium nitride
02 engineering and technology
Substrate (electronics)
engineering.material
01 natural sciences
chemistry.chemical_compound
0203 mechanical engineering
Coating
Specific surface area
0103 physical sciences
Materials Chemistry
[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering
Composite material
Photocatalysis
Splat test
Ceramic powder
Agglomerated powder
010302 applied physics
Cold spray
Condensed Matter Physics
Surfaces, Coatings and Films
020303 mechanical engineering & transports
chemistry
Gallium nitride (GaN)
engineering
Particle
Crystallite
Subjects
Details
- Language :
- English
- ISSN :
- 10599630 and 15441016
- Database :
- OpenAIRE
- Journal :
- Journal of Thermal Spray Technology, Journal of Thermal Spray Technology, ASM International/Springer, In press, ⟨10.1007/s11666-021-01207-w⟩
- Accession number :
- edsair.doi.dedup.....13d3a6764e5495426308e6c9818dbd38