A Review of Thermally Sprayed Polymer Coatings

Koivuluoto, Heli

doi:10.1007/s11666-022-01404-1

Cited by 37 publications

(28 citation statements)

References 62 publications

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“…Thermal spray technologies with extensive possibilities can deposit versatile coating materials from soft polymeric materials to hard, brittle ceramics that meet the demands of the industry (Ref 18,25). The efforts to fabricate nonwetting surfaces using thermal spray technologies consist of two main strategies: surface texturing and chemical modification of the surfaces ( Ref 12,[26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Wetting Behavior and Functionality Restoration of Cold-Sprayed Aluminum-Quasicrystalline Composite Coatings

et al. 2023

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Coating design is an efficient strategy to engineer wettability of surfaces and adjustment of the functionality to the necessities in industrial sectors. The current study reveals the feasibility of functional aluminum/quasicrystalline (Al-QC) composite coatings fabrication by cold spray technology. A commercially available Al-based quasicrystalline powder (Al-Cr-Fe-Cu) was combined with aluminum alloy (Al6061) feedstock materials to make coatings with various compositions. A set of cold spray process parameters was employed to deposit composite coatings with different QC-Al ratios and Al6061 coatings as counterparts. The wettability of the coating surfaces was measured by static water droplet contact angles using a droplet shape analyzer and investigation of the dynamic of water droplet impact by high-speed imaging. Through microstructural studies, the Al-QC composites revealed dense structure, well-integrated and adherent deposits, providing structural reliability and enhanced hydrophobic behavior. In the last step of this work, composite coatings were deposited over eroded cold-sprayed Al6061 and a selected composite to demonstrate the feasibility of repairing the damaged part and function restoring. The results and approach used in this work provide understanding of cold-sprayed Al-QC composite coatings manufacturing and their wetting behavior state for cross-field applications.

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Section: Introductionmentioning

confidence: 99%

“…Despite its many benefits, cold spraying is not as much explored as thermal spraying for fabricating non-wetting surfaces. (Ref 18,25,42,43). These advantages can be used for successful fabrication Al-based alloys (Ref 44), as widely used engineering alloys used in industry with naturally hydrophilic behavior (Ref 45).…”

Section: Introductionmentioning

confidence: 99%

Wetting Behavior and Functionality Restoration of Cold-Sprayed Aluminum-Quasicrystalline Composite Coatings

et al. 2023

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“…This opens the possibility of using them to coat substrates that span a range of sizes. Ultimately, this is advantageous in terms of upscaling the fabrication of electrochromic devices by large-scale-processing techniques such as roll-to-roll printing [ 24 , 25 , 26 ], spray coating [ 27 , 28 ], ink-jet printing [ 29 , 30 , 31 ], and slot-die coating [ 32 ].…”

Section: Overviewmentioning

confidence: 99%

Survey of Recent Advances in Molecular Fluorophores, Unconjugated Polymers, and Emerging Functional Materials Designed for Electrofluorochromic Use

2023

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In this review, recent advances that exploit the intrinsic emission of organic materials for reversibly modulating their intensity with applied potential are surveyed. Key design strategies that have been adopted during the past five years for developing such electrofluorochromic materials are presented, focusing on molecular fluorophores that are coupled with redox-active moieties, intrinsically electroactive molecular fluorophores, and unconjugated emissive organic polymers. The structural effects, main challenges, and strides toward addressing the limitations of emerging fluorescent materials that are electrochemically responsive are surveyed, along with how these can be adapted for their use in electrofluorochromic devices.

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“…However, the working environment is usually harsh, and the steel surface is subject to wear, cracks and other defects. The common repair methods in the market are laser cladding [ 4 ], brush plating [ 5 ], spraying process [ 6 ], etc. However, the brush plating coating is shallow, the strength of the bond is low, there is a large residual stress generated, and the coating easily falls off [ 7 ]; the spraying process itself is low strength, not up to the strength of the metal itself, and the spraying layer will produce certain porosity, flow hanging, bubbles, unevenness and other problems [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study of Multi-Field Coupling for Laser Cladding of Shaft Parts

Zhao

Yang

et al. 2023

Micromachines

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Since shaft parts operate under harsh environments for a long time, many critical parts suffer from corrosion, wear and other problems, leading to part failure and inability to continue in service. It is imperative to repair failed parts and increase their service life. An orthogonal experimental scheme is designed to numerically simulate the process of laser cladding of Inconel 718 alloy powder on 4140 alloy structural steel based on the ANSYS simulation platform, derive the relationship equation of cladding layer thickness according to the heat balance principle, establish a finite element model, couple three modules of temperature field, stress field and fluid field, and analyze different modules to realize the monitoring of different processes of laser cladding. The optimal cladding parameters were laser power 1000 W, scanning speed 15 rad/s, spot radius 1.5 mm, thermal stress maximum value of 696 Mpa, residual stress minimum value of 281 Mpa, and the degree of influence of three factors on thermal stress maximum value: laser power > spot radius > scanning speed. The pool in the melting process appears to melt the “sharp corner” phenomenon, the internal shows a double vortex effect, with a maximum flow rate of 0.02 m/s. The solidification process shows a different shape at each stage due to the different driving forces. In this paper, multi-field-coupled numerical simulations of the laser cladding process were performed to obtain optimal cladding parameters with low residual stresses in the clad layer. The melt pool grows and expands gradually during melting, but the laser loading time is limited, and the size and shape of the melt pool are eventually fixed, and there is a vortex flowing from the center to both sides of the cross-section inside the melt pool, forming a double vortex effect. The solidification is divided into four stages to complete the transformation of the liquid phase of the melt pool to the solid phase, and the cladding layer is formed. The multi-field-coupled numerical simulation technique is used to analyze the temperature, stress and fluid fields to provide a theoretical basis for the residual stress and surface quality of the clad layer for subsequent laser cladding experiments.

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A Review of Thermally Sprayed Polymer Coatings

Cited by 37 publications

References 62 publications

Wetting Behavior and Functionality Restoration of Cold-Sprayed Aluminum-Quasicrystalline Composite Coatings

Wetting Behavior and Functionality Restoration of Cold-Sprayed Aluminum-Quasicrystalline Composite Coatings

Survey of Recent Advances in Molecular Fluorophores, Unconjugated Polymers, and Emerging Functional Materials Designed for Electrofluorochromic Use

Numerical Simulation Study of Multi-Field Coupling for Laser Cladding of Shaft Parts

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