Solid state additive manufacture of highly-reflective Al coatings using cold spray

Jenkins, R.G.; Aldwell, Barry; Yin, Shuo; Chandra, Sudhir; Morgan, Gary; Lupoi, Rocco

doi:10.1016/j.optlastec.2019.02.011

Cited by 20 publications

(10 citation statements)

References 30 publications

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“…26,27 Spray coating technique has recently been reported in which the luminescent species were sprayed on the surface of cells. 28 A photocurable fluoropolymer-deposited coating system is also incorporated. 14 During the photo-conversion process, these LDS layers absorb the short-wavelength UV photons (which are not efficiently and properly utilized by the devices) and then re-emit them at higher wavelengths.…”

Section: Luminescent Down-shifting (Lds)mentioning

confidence: 99%

Enhancing the Photovoltaic Performance of Solid-State Dye-Sensitized Solar Cells with Composite Materials and Luminescent Down-Shifting

Rehman

Aslam

Khan

et al. 2020

Journal of Elec Materi

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Dye-sensitized solar cells produce saturation of electrons and holes when exposed to high-intensity UV photons. These photon energies do not match the bandgap of the semiconductor materials, which not only degrades the dye and electrolyte but also disrupts the electron kinetics. In this work, graphene oxide (GO) was incorporated into TiO 2 to form a composite photoanode structure. The results indicated that a composite photoanode based on GO/TiO 2 enhanced the power conversion efficiency of a solid-state dye-sensitized solar cell (ss-DSSC) by 62% compared to that of pure TiO 2. This enhancement is attributed to the high conductivity of graphene oxide. Further improvement in device performance was obtained by plasmonic luminescent down-shifting (LDS), where the UV region of the solar spectrum is shifted hundreds of nanometers. The multifunctional LDS coating layer was fabricated with a composite of ZnSe quantum dots and Ag nanoparticles. The experimental results demonstrated the ability of LDS to absorb photons at wavelengths below 400 nm and re-emit them at longer wavelengths (above 400 nm), where the cell has better photovoltaic response. When compared to a bare ss-DSSC, the power conversion efficiency (PCE) is enhanced by 37.62% for cells with a Ag/ZnSe coating layer. Moreover, the LDS-coated device exhibits 16.45% increased photon-to-current conversion efficiency compared to the LDS-free device for wavelengths lower than 500 nm. The 240-h aging tests confirmed that the LDS-coated ss-DSSC retained $ 83% of its original PCE value. This potential LDS coating layer not only leads to excellent device stability but also improves the cell performance, which increases the market value of the ss-DSSCs.

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Section: Luminescent Down-shifting (Lds)mentioning

confidence: 99%

Enhancing the Photovoltaic Performance of Solid-State Dye-Sensitized Solar Cells with Composite Materials and Luminescent Down-Shifting

Rehman

Aslam

Khan

et al. 2020

Journal of Elec Materi

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“…Two metal particles were simulated from experimentally demonstrated conditions. The titanium conditions were replicated from a report by Marrocco et al, and the aluminum conditions were from Jenkins et al [13,26]. The material properties of the particles are given in Table 2.…”

Section: Lsmentioning

confidence: 99%

“…The aluminum particle was injected before the nozzle throat, while the titanium particle was injected after the nozzle throat according to the experimental conditions [13,26,31]. Both particles show Biot numbers lower than the 0.1 lumped thermal capacitance threshold along the length of the nozzle.…”

Section: Metal Particle Simulationsmentioning

confidence: 99%

Cold Spray Additive Manufacturing of Polymers: Temperature Profiles Dictate Properties Upon Deposition

Henning¹,

Haas²,

Stanzione³

et al. 2020

SAMPE 2020 | Virtual Series

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The cold spray additive manufacturing process enables deposition of coatings and structures by impact bonding microparticles to surfaces through preheated, nozzle-accelerated gas flow. Most established models of gas-particle heat transfer in cold spray assume lumped thermal capacitance, which ignores particle temperature distributions and is typically valid for metals. However, recent advances in cold spray consider polymeric systems that differ categorically and considerably in thermophysical properties compared to metals. Particularly, the low Biot number (Bi) assumption may be invalid, impacting efficiency and quality of polymeric particle deposition. We describe herein a 1D transient gas-particle heat transfer model that simulates temperature profile evolution in a representative particle traveling through a cold spray nozzle. With this model, we simulated thermal histories of polymeric materials at realistic processing conditions. Polymer sprays with Bi consistently near 10 -1 or greater demonstrated thermal inhomogeneities, in some cases straddling the glass transition temperature. Thermal stratification provides insight into physical conditions of a particle before deposition, which can guide processing parameters to improve deposition efficiency and quality of polymer cold sprays.

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“…Single coatings, such as Al coatings [ 33 ] and Cr coatings, [ 34 ] have been difficult to meet the requirements of industrial applications. Composite coatings have become a research hotspot because of their excellent comprehensive properties.…”

Section: Introductionmentioning

confidence: 99%

High‐temperature corrosion of mechanically alloyed Cr–AlSi12 composite coatings on Ti–6Al–4V alloy substrate

Jiang

Feng

Shen

2022

Materials & Corrosion

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In the present work, the Cr-AlSi12 composite coatings were successfully synthesized on the Ti-6Al-4V alloy substrate by using the mechanical alloying method. The effects of raw Cr particle size, milling duration, and annealing treatment on the preparation of the coatings were investigated. The asprepared coatings consisted of the inner coating layer with coarse Cr particles and the outer coating layer with refined and highly homogenized structure. The annealing treatment could promote element diffusion and alloying; it was favorable to the densification and oxidation resistance of the coatings. There is a highly densified alloyed layer in the outer coating. The annealed coating showed excellent friction and wear resistance. After the oxidation process, the annealed coating showed the best high-temperature oxidation resistance. The oxidized annealed coating exhibited four layers, which included the thin Al 2 O 3 oxide film, the homogenized alloyed layer, the composite layer consisted of Al 2 O 3 and coarse Cr particles surrounded by alloyed layer, and the Al 3 Ti diffusion layer. This was favorable to the improvement of high-temperature oxidation resistance. The oxidation process of the annealed coating was elaborated.

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Solid state additive manufacture of highly-reflective Al coatings using cold spray

Cited by 20 publications

References 30 publications

Enhancing the Photovoltaic Performance of Solid-State Dye-Sensitized Solar Cells with Composite Materials and Luminescent Down-Shifting

Enhancing the Photovoltaic Performance of Solid-State Dye-Sensitized Solar Cells with Composite Materials and Luminescent Down-Shifting

Cold Spray Additive Manufacturing of Polymers: Temperature Profiles Dictate Properties Upon Deposition

High‐temperature corrosion of mechanically alloyed Cr–AlSi12 composite coatings on Ti–6Al–4V alloy substrate

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