Alternative low-power plasma-sprayed inconel 625 coatings for thermal solar receivers: Effects of high temperature exposure on adhesion and solar absorptivity

Merino-Millan, David; Múnez, C.J.; Garrido-Maneiro, Miguel Ángel; Poza, P.

doi:10.1016/j.solmat.2022.111839

Cited by 15 publications

(7 citation statements)

References 71 publications

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“…This is different from what is commonly observed in coatings generated by thermal spraying. The cohesion between the molten splats is higher than the adhesion with the substrate, and the failure is usually driven by adhesive mechanism [2,3]. It can be ascribed to the presence of porosities and internal discontinuities inside the coating, which weakens the bonding between the splats [37].…”

Section: Resultsmentioning

confidence: 99%

“…However, the measured hardness is consistent with the one obtained by Huang [29] by using LPCS, which reported values around 120 HV. Further improvement can be potentially achieved by adopting higher pressure (middle-pressure cold spray, for instance), by using harder additives [37], or by post-deposition heat treatment [2]. It is interesting to note that the hardness, measured from the substrate to the surface, was quite uniform, ranging between 155 and 197 HV, with a peak value located at 300 μm from the substrate.…”

Section: Optimisation Of the Coatingmentioning

confidence: 99%

“…Nowadays, Thermal spray processes (like High Velocity Oxygen Fuel (HVOF), flame arc, and plasma spray) are emerging as suitable technology to produce solar selective coatings for CSP receivers and as corrosion-resistant coatings in energy storage system components, balancing the required optical properties and the structural integrity necessary to withstand harsh working conditions [1]. Compact or low-power alternatives of thermal spraying, with, have also been investigated on different material systems because of their less demanding operative requirements and being suitable for in-situ applications [2,3]. They also prevent the deterioration of the substrate and reduce the oxidation and dissolution of the constituents of the powders [3].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical optimisation of Ni coatings produced by low-pressure cold spray

Rubino,

Merino-Millan,

Tucci

et al. 2023

Surface Engineering

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Nickel-based coatings are widely used as thermal barriers in several sectors thanks to their remarkable corrosion and wear resistance and outstanding stability at high temperatures. Recently, Ni coatings, produced with thermal spraying and vacuum techniques, have been investigated for solar power energy applications. In the present manuscript, low-pressure cold spray (LPCS) was used to deposit pure Nickel onto a steel substrate. The influence of gas temperature, nozzle stand-off distance, and advancing speed on morphological and mechanical properties were studied. The optimal deposition conditions were derived by ANOVA analysis. The hardness and the adhesion strength were approximately 160 HV and 26 MPa, respectively. The highest thickness obtained under the optimised deposition with a single pass was around 900 µm.

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Section: Resultsmentioning

confidence: 99%

Section: Optimisation Of the Coatingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical optimisation of Ni coatings produced by low-pressure cold spray

Rubino,

Merino-Millan,

Tucci

et al. 2023

Surface Engineering

Self Cite

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“…The deposits were performed onto AISI 316L stainless steel coupons with dimensions of 40 x 40 x 5 mm (width x height x thickness). The process parameters were previously optimized [9] and are presented in Table 2.…”

Section: Fabricationmentioning

confidence: 99%

Development of Compact Plasma Sprayed Coatings for High Temperature Solar Tower Receivers

Merino-Millan,

Múnez,

Garrido-Maneiro

et al. 2023

SolarPACES Conf Proc

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The current developments in concentrating solar power are focused in the third generation. Increase the working temperature of the plants is the main objective for this new generation. For this new condition, alternative materials for the receivers must be explored. In this work, a nickel alloy coating has been fabricated using a compact plasma spray system to be used on the receiver. This thermal spray system could be used for in-situ maintenance and overhaul as it is portable. Then the coatings have been exposed at high temperature of 800 ºC, as expected in the third generation, during different exposure times. The evolution of the coating solar absorptivity and adherence have been studied over the selected exposure times. A maximum value of solar absorptivity 0.93 was reported for the longer exposure time studied. The adherence increment was remarkable reaching a value of about 57 MPa. These results show that these coatings could represent a durable alternative while the solar absorptivity maintains high values.

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“…X-ray analysis revealed various intermetallic and oxide formations in the coating, which improves the wettability of the plates. The effect of temperature on the adhesive strength of the Inconel 625 coating on steel obtained by plasma spraying was studied [4]. The coatings were heat treated at two temperatures: 520 °C and 800 °C, with different holding times.…”

Section: Introductionmentioning

confidence: 99%

Modeling of laser reflow of a powder heat-protective coating on a carbon composite

Alisin

Roshchin

2022

J. Phys.: Conf. Ser.

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The article discusses the issues of creating a heat-shielding coating to protect carbon composites from oxidation and ablation in high-temperature gas flows. The prospects of creating a framework structure containing a refractory zirconium dioxide powder in a metal matrix are substantiated. Particular attention is paid to the distribution of heat fluxes in the process of laser melting of the coating. The temperature in the coating is calculated as the melt front propagates, which opens up the possibility of optimizing the parameters of the coating laser processing technology. The developed technology is promising for the protection of carbon composites in the conditions of their use in the flow path of turbine engines.

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Alternative low-power plasma-sprayed inconel 625 coatings for thermal solar receivers: Effects of high temperature exposure on adhesion and solar absorptivity

Cited by 15 publications

References 71 publications

Mechanical optimisation of Ni coatings produced by low-pressure cold spray

Mechanical optimisation of Ni coatings produced by low-pressure cold spray

Development of Compact Plasma Sprayed Coatings for High Temperature Solar Tower Receivers

Modeling of laser reflow of a powder heat-protective coating on a carbon composite

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