Behavior of Ni-Based Superalloys in an Actual Waste Incinerator Plant Under Cyclic Conditions for 1,000 h at 900°C

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

doi:10.5006/1163

Cited by 16 publications

(17 citation statements)

References 35 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 sample preparation, for hot corrosion testing and characterisation after hot corrosion testing, is similar to that reported in earlier publications. [1][2][3][4] The samples were exposed in the incinerator plant for 10 cycles which consist of 100 h duration each and were visually examined after each cycle. The weight change measurements were also recorded after each cycle.…”

Section: Characterisation and Hot Corrosion Studymentioning

confidence: 99%

“…In the waste incinerators and other similar environments, the presence of small concentration of chlorine accelerates the corrosion reactions through oxychlorination reactions known as 'active oxidation' phenomenon. [1][2][3][4] If 'active oxidation' takes place, then even small amount of chlorine circulating the coating may cause severe damage on bonding strength of the coating. [1][2][3][4]7 Schematic of 'active oxidation mechanism is reported in Fig.…”

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: Characterisation and Hot Corrosion Studymentioning

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

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“…The mounted specimens were mirror polished before further study by the similar techniques as reported by authors in earlier publications [18,20]. The microstructure of a newly developed coating was studied by using optical microscopy, SEM (BSEI) micrographs, EDX=elemental mental mapping analysis, XRD technique, Vicker's microhardness test, and surface roughness testing.…”

Section: Methodsmentioning

confidence: 99%

“…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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