Performance of cold spray coating in industrial medical waste incinerator

Kalsi, Sachin; Sidhu, T. S.; Singh, Harminder

doi:10.1179/1743294414y.0000000259

Cited by 18 publications

(21 citation statements)

References 16 publications

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“…Owing to this unique coating structure, the chlorine present on the surface deposits from the incinerator environment is noticed to be unable to start the oxychlorination reactions based active oxidation mechanism. This mechanism first reported by Miller et al 18 and is reported [1][2][3][4]7 widely for the chlorine based corrosive environment similar to incinerators (Fig. 1).…”

Section: Mechanismsupporting

confidence: 62%

“…The role of the coating is to provide a metal surface composition which reacts with the environment to produce a protective scale and block the penetration of corrosive species towards the substrate. [4][5][6] The highly dense microstructure with low open porosity, along with resistance to spallation and cracks due to thermal fluctuations and erosivity of the flue gases, is the requirement of coatings. Effective coatings also need to restrict the diffusion of substrate elements towards the exposed surface.…”

Section: Introductionmentioning

confidence: 99%

“…3,4,7 Unlike other traditional members of thermal spray family, this is a low temperature coating deposition technology. [7][8][9][10][11][12][13][14][15][16] Thus, this solid state coating technique is foreseen as a viable solution to the development of coatings for the boiler tubes used in the corrosive environment of energy generation systems.…”

Section: Introductionmentioning

confidence: 99%

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Behaviour of cold sprayed superalloy in incinerator at 900°C

Singh

Sidhu²,

Kalsi

2015

Surface Engineering

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The present study tested the ability of a novel, facile and relatively less reported cold spray technique to develop the coatings for high temperature applications in the boiler tubes. The behaviour of the coating depends upon its microstructure, which further is decided by the coating deposition technique. The coating-substrate system material composition also affects its behaviour. For current investigation, 75Cr 3 C 2 -25(Ni-20Cr) coating is cold sprayed on Superni 75 superalloy and its behaviour is studied in a hot corrosive chlorine based aggressive environment of actual waste incinerator at 900uC. The coating microstructure obtained by cold spray process is noticed to be suitable for preventing the transport of environmental corrosive species towards the superalloy substrate.

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Section: Mechanismsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Behaviour of cold sprayed superalloy in incinerator at 900°C

Singh

Sidhu²,

Kalsi

2015

Surface Engineering

Self Cite

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“…If the microstructure is not good enough, then the environmental species can reach the coatingsubstrate interface. This can trigger the failure of the bonding between the coating and the substrate [13][14][15][16][17][18][19][20][21][22]. The microstructure is mainly decided by the coating deposition technique.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Microstructure by High Velocity Impacts of Particles by Cold Spray

Singh

Sidhu²,

Kalsi

et al. 2015

Materials and Manufacturing Processes

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The cold spray technique is still in its innovation stage. This process is similar to other thermal coating techniques with the additional benefit of lower working temperature than the melting energy of the feedstock material. In this study, a new coating-substrate system is developed by using the 80%Ni-20%Cr feedstock powder sprayed by this technique on a superni 601 superalloy substrate. The coating microstructure depends upon both the substrate and coating material properties, and thus, coating obtained in this study has a unique microstructure. The coating microstructure developed and tested in this study by scanning electron microscopy/energy-dispersive x-ray spectroscopy (SEM/EDX) and X-ray diffraction (XRD) techniques is found to be suitable for boilers and incinerators. INTRODUCTIONThe cold spray coating deposition technique is a relatively new member of the thermal spray family but with the added advantage that coating particles remained in the solid state in the as-sprayed coating [1][2][3][4][5][6][7][8][9][10][11][12]. This property of the cold spray process prompted the authors to develop and study the new coating-substrate system by this process for different applications, especially for corrosive environments at temperatures near to 900 C. The study related to the cold spray process is reported in detail in the earlier publications of the authors [8,9].The base material chosen in this study for cold spraying (superni 601 grade superalloy) is for providing strength to the newly developed system, at high working temperature of boilers and incinerators. The 80Ni-20Cr (wt.%) coating composition is selected for providing elements for the formation of the corrosion resistant oxide scale at high operating temperature. Though, the coating composition is good enough for the corrosive environment, the composition is not a sole criterion for providing effective corrosion protection. The development of the required coating microstructure is equally important for this purpose. The microstructure of the coating should be able to block the transport of ionic species and elements from both the environment and the substrate. If the microstructure is not good enough,

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“…It was found that the minor alloying elements such as Mo, present in the coatings can support the formation of protective chromia [49], [50]. Zahs et al studied [40] the chlorine-induced high temperature corrosion of a wide range of alloys with focus on the behaviour of the alloying elements between 400-700 °C.…”

Section: Structure and Surface Morphology Of Corrosion Productsmentioning

confidence: 99%

Effect of SiO2 Dispersion on Chlorine-Induced High-Temperature Corrosion of High-Velocity Air-Fuel Sprayed NiCrMo Coating

et al. 2018

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NiCrMo coatings with and without dispersed SiO2 were deposited using high velocity air-fuel (HVAF) technique. Thermogravimetric experiments were conducted in 5% O2+500 vppm HCl+N2 with and without a KCl deposit at 600 °C for up to 168 h. The SiO2-containing coating showed lower weight change due to formation of a protective and adherent Cr-rich oxide scale. SiO2 decelerated short-circuit diffusion of Cr 3+ through scale's defects, e.g., vacancies, and promoted the selective oxidation of Cr to form the protective Cr-rich oxide scale. Furthermore, the presence of SiO2 led to less subsurface depletion of Cr in the coating, and accordingly less corrosion of the substrate. The formed corrosion product on the SiO2-free coating was highly porous, non-adherent, and thick.

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Performance of cold spray coating in industrial medical waste incinerator

Cited by 18 publications

References 16 publications

Behaviour of cold sprayed superalloy in incinerator at 900°C

Behaviour of cold sprayed superalloy in incinerator at 900°C

Evolution of the Microstructure by High Velocity Impacts of Particles by Cold Spray

Effect of SiO2 Dispersion on Chlorine-Induced High-Temperature Corrosion of High-Velocity Air-Fuel Sprayed NiCrMo Coating

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