Microstructural characteristics and mechanical properties of HVOF sprayed NiCrAl coating on superalloys

Mahesh, R.; Jayaganthan, R.; Prakash, S.

doi:10.1016/j.jallcom.2008.01.025

Cited by 40 publications

(18 citation statements)

References 20 publications

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“…8b, c, it was observed that the O-ring-like extra parts are attached on the outer surface of the nanotubes, with a compact layer of 272-nm thickness under the tubular layer. Elemental EDX mapping in the scanning electron microscope [34] was further used to test the elemental distribution in the compact layer and the tubular layer. The distribution of oxygen is not homogeneous as more oxygen exists in the tubular layer than the compact layer, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Fabrication parameter-dependent morphologies of self-organized ZrO2 nanotubes during anodization

Dong

Luo

et al. 2011

J Solid State Electrochem

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Zirconia (ZrO 2 ) nanotubes have been synthesized using a facile anodizing process in organic electrolyte systems containing a low content of fluoride. The nanotube architecture evolution was recorded at different anodization periods (1-24 h) by scanning electron microscopy. A compact layer was found between the Zr substrate and its upper tubular layer after 1 h of anodization, whereas after further anodization for 3 h the compact layer disappeared. Meanwhile, ZrO 2 nanotubes turned to a uniform structure from top to bottom. However, after 18-24-h-long anodization, the uniform tubular layer was replaced by a random layer composed of various structural defects. Since the compact layer was not completely dissolved, the retained compact layer yielded O-rings with double walls on the outer surface of the nanotubes.

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Section: Resultsmentioning

confidence: 99%

Fabrication parameter-dependent morphologies of self-organized ZrO2 nanotubes during anodization

Dong

Luo

et al. 2011

J Solid State Electrochem

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“…Mahesh et al 22 observed a porosity level around 1?7% for the HVOF NiCrAl coatings. Thus, the porosity level of NiCrAlC coatings can be considered good when compared with values from the literature for HVOF thermal spray process.…”

Section: Resultsmentioning

confidence: 97%

Abrasion and corrosion resistance of new Ni–based coating deposited by HVOF thermal spray process

Benegra

Magnani

Goldenstein

et al. 2010

Surface Engineering

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Coatings based on NiCrAlC intermetallic based alloy were applied on AISI 316L stainless steel substrates using a high velocity oxygen fuel torch. The influence of the spray parameters on friction and abrasive wear resistance were investigated using an instrumented rubber wheel abrasion test, able to measure the friction forces. The corrosion behaviour of the coatings were studied with electrochemical techniques and compared with the corrosion resistance of the substrate material. Specimens prepared using lower O 2 /C 3 H 8 ratios showed smaller porosity values. The abrasion wear rate of the NiCrAlC coatings was much smaller than that described in the literature for bulk as cast materials with similar composition and one order of magnitude higher than bulk cast and heat treated (aged) NiCrAlC alloy. All coatings showed higher corrosion resistance than the AISI 316L substrate in HCl (5%) aqueous solution at 40uC.

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“…[1][2][3][4][5][6] High velocity oxyfuel spray technique enables higher kinetic energy of the particulates, resulting in consistent microstructure 7 and a homogeneous coating. 8 The actual formation of the coating particle involves multiple physicalchemical interactions between materials and gases and between droplets and substrate.…”

Section: Introductionmentioning

confidence: 99%

Effect of zirconium addition in HVOF sprayed Ni–20Cr coating

Kaushal

Kaur

Singh

et al. 2013

Surface Engineering

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High velocity oxyfuel spraying was used to deposit Ni-20Cr coating on an ASTM-SA213-T22 boiler steel with and without 1%Zr addition. High temperature oxidation behaviour of both coatings was evaluated under cyclic thermal loading conditions at an elevated temperature of 900uC. Mass change data were measured to formulate the kinetics of oxidation for the specimens. The exposed specimens were characterised by X-ray diffraction and field emission scanning electron microscopy/energy dispersive spectroscopy. It was observed that mass loss was reduced by 46% after the Zr addition in the commercially available Ni-20Cr coating. The formation of Zr rich pegs in the blended coating might have resulted in beneficial results.

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Microstructural characteristics and mechanical properties of HVOF sprayed NiCrAl coating on superalloys

Cited by 40 publications

References 20 publications

Fabrication parameter-dependent morphologies of self-organized ZrO2 nanotubes during anodization

Fabrication parameter-dependent morphologies of self-organized ZrO2 nanotubes during anodization

Abrasion and corrosion resistance of new Ni–based coating deposited by HVOF thermal spray process

Effect of zirconium addition in HVOF sprayed Ni–20Cr coating

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