Evaluation of Thermocyclic Oxidation Behavior of HVOF Sprayed WC-CrC-Ni Coatings

Somasundaram, B.; Kadoli, Ravikiran; Рамеш, М. Р.; Ramesh, C.S.

doi:10.9756/bijiems.10413

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…It is also reported by Chatha et al [31]; Yin et al [48]; Song et al [24]; Alia et al [33]; Bai et al [35]; that Cr 2 O 3 obstructs the corrosion of substrate alloys by preventing the dissemination of oxidizing species. The presence of NiCr 2 O 4 spinels in the surface oxide scale also helps increase corrosion endurance, since these phases have lower anion and cation diffusion coefficients than their parent oxides [67]. The Cr exhibits better affinity towards oxygen and develops more enduring oxide.…”

Section: Discussionmentioning

confidence: 99%

Effect of burnishing on HVOF coated boiler steel against hot corrosion in actual boiler environment

Agnihotri,

Kalsi,

Kansal

2023

Surface Engineering

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Hot corrosion of boiler tubes used in steam-generating systems has been recognized as a severe problem, resulting in tube wall thinning and premature failure. In this study, the effect of burnishing the thermal sprayed coatings against high-temperature corrosion of SA213-T22 boiler steel in actual environmental conditions of coal-fired boiler has been investigated. An experimental study was carried out for ten cycles, where the individual cycle consists of one-hundred hours of exposure trailed by one hour of ambient cooling. The hot corroded specimens are visually inspected at the end of each cycle to check for any variation in colour, luster, spalling tendency, and other physical changes in scale. The tested specimens were characterized through Thermogravimetric Technique, Microhardness Tester, Optical Microscope, Scanning Electron Microscope, and X-Ray Diffractometer to study their hot corrosion performance. The findings of this work suggest that burnishing can be potentially used for providing superior hot corrosion protection to any of the thermal sprayed coated specimens.

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Section: Discussionmentioning

confidence: 99%

Effect of burnishing on HVOF coated boiler steel against hot corrosion in actual boiler environment

Agnihotri,

Kalsi,

Kansal

2023

Surface Engineering

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“…The other branch uses a metal alloy with 95.6% nickel, 4.4% silicon, and 0.1% magnesium. The coated steel substrates were investigated [23] using XRD, SEM-EDAX, and other techniques. Cr, Ni, and their oxides may prevent oxidising species from penetrating coated surfaces.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Temperature Drift with Thermocyclic Oxidation on K-Type Bare Thermocouples

2024

Teh. vjesn.

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The irrevocable variations in the thermoelectric properties arise in normally used bare type-K thermocouples that are subjected to high temperatures. Over an extended period of time, these long-term modifications may manifest themselves as a systematic shift in the thermocouple's characteristics. This paper investigates the temporal instability of thermocouple output at temperatures over 800 °C. This investigation focuses on the change in temperature output that occurs in thermocouples of varying diameters after they have been subjected to high temperatures for more than 365 hours. This data was used to assess the relationship between the amount of temperature drift with different lead diameters and the degradation of the material compositions of thermocouple thermoelements. It is critical to determine the pace at which the thermocouple material degrades over time. This paper concentrates in detail on the drift analysis of thermocouples of different diameters which were tested at high temperatures with their segmental material compositions. Within the scope of this investigation, the elemental analysis of the thermocouple could be carried out using scanning electron microscopy in conjunction with an energy dispersive X-ray (SEM-EDAX) both before and after the thermocouple had degraded. The results show that the thermoelectric response decreases dramatically and the highest drift reaches to about 196.4 µV for (Ø0.51 mm), about 118.6 µV for (Ø1.29 mm) and 79.2 µV for (Ø2.05 mm) thermocouples, respectively at 800 °C after prolonged usage of 365 hours. The highest thermal drift was achieved with [90-10] vol% Ni-Cr / [95-05] vol % Ni-Al, Mn, Si composite thermocouples, which related to the increased amount of the 2-3 oxide layers that were formed in the composite of bare thermoelements.

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Study of thermal shock resistance of HVAF spraying thickness gradient WC-Cr3C2-Ni coating on crystallizer surface

Zhang,

Hu,

Peng

et al. 2024

J Aust Ceram Soc

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Evaluation of Thermocyclic Oxidation Behavior of HVOF Sprayed WC-CrC-Ni Coatings

Abstract: Abstract---

Cited by 4 publications

References 19 publications

Effect of burnishing on HVOF coated boiler steel against hot corrosion in actual boiler environment

Effect of burnishing on HVOF coated boiler steel against hot corrosion in actual boiler environment

Investigation of Temperature Drift with Thermocyclic Oxidation on K-Type Bare Thermocouples

Study of thermal shock resistance of HVAF spraying thickness gradient WC-Cr3C2-Ni coating on crystallizer surface

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