Microstructure and Adhesion Strength of Ni3Ti Coating Prepared by Mechanical Alloying and HVOF

Reddy, Nagaraja C.; Kumar, Bhupender; Рамеш, М. Р.; Koppad, Praveennath G.

doi:10.1134/s0031918x18050113

Cited by 24 publications

(5 citation statements)

References 25 publications

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“…Two nickel based coating materials, Ni 3 Ti and Ni 3 Ti+(Cr 3 C 2 +20NiCr) were prepared by ball milling and sprayed on the aforementioned substrates using HVOF technique. The complete fabrication details of coating materials by mechanical alloying and HVOF technique can be found in our previous publication but a brief details are provided here [21]. The average particle size of both the coating powders Ni 3 Ti and Ni 3 Ti+(Cr 3 C 2 +20NiCr) were in the range of 60-70 μm.…”

Section: Methodsmentioning

confidence: 99%

Hot corrosion behaviour of HVOF sprayed Ni₃Ti and Ni₃Ti + (Cr₃C₂ + 20NiCr) coatings in presence of Na₂SO₄-40%V₂O₅ at 650 °C

Reddy

Koppad

Reddappa

et al. 2019

Surf. Topogr.: Metrol. Prop.

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Ni 3 Ti and Ni 3 Ti+(Cr 3 C 2 +20NiCr) coatings were deposited on gas turbine based ASTM B265 titanium (Ti-15) and AISI 420 stainless steel (MDN-420) substrate materials using HVOF technique. Thermocyclic hot corrosion tests were carried out at 650 °C in molten salt environment of Na 2 SO 4 −40%V 2 O 5 for about 50 cycles. Thermogravimetric analysis was carried out to study the hot corrosion kinetics of uncoated and coated titanium and stainless steel substrates. The weight gain per unit area showed that the coated substrate materials displayed better resistance to hot corrosion when compared with that of uncoated substrate materials. The surface morphology of uncoated and coated substrate materials were analysed using scanning electron microscopy and elemental analysis. The formation of different types of oxides and compounds were analysed using x-ray diffraction. The uncoated substrates surface showed microspalling at several regions while coated substrates surface were composed of protective oxide layers. The presence of ternary NiCr 2 O 4 protective oxides on the surface of Ni 3 Ti+(Cr 3 C 2 +20NiCr) coated substrates leads to reduction in the diffusion of corrosive species inside the coating.

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Section: Methodsmentioning

confidence: 99%

Hot corrosion behaviour of HVOF sprayed Ni₃Ti and Ni₃Ti + (Cr₃C₂ + 20NiCr) coatings in presence of Na₂SO₄-40%V₂O₅ at 650 °C

Reddy

Koppad

Reddappa

et al. 2019

Surf. Topogr.: Metrol. Prop.

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“…Coatings based on Cr 3 C 2 -NiCr are used to protect the surface of parts operating at high temperatures and in corrosive environments from corrosion and wear [1,2], which is provided by the ability to bind the solid phase of Cr 3 C 2 carbide with the NiCr matrix and to create a high density of the coating material [3,4]. Various spray technologies are used for coating deposition: atmospheric plasma spraying (APS), high velocity oxygen fuel spraying, air-fuel spraying (HVOF, HVAF), and detonation spraying [5][6][7][8]. In the process of coating Cr 3 C 2 -NiCr powder by thermal methods, a change in the chemical composition of the material is observed due to a decrease in the carbide content in the coating due to elastic rebound [9][10][11][12][13][14][15] and due to oxidation [16,17] caused by the presence of oxygen and superheated water vapor in the combustion products [18,19].…”

Section: Introductionmentioning

confidence: 99%

Influence of Spraying Parameters on the Structure and Tribological Properties of Cr3C2-NiCr Detonation Coatings

Rakhadilov

Kakimzhanov

Dautbekov

et al. 2023

Advances in Tribology

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In this work, the influence of spray parameters on the formation of the microstructure, phase composition, and the tribological properties of detonation flame sprayed coatings was studied. It was determined that the chemical composition of Cr3C2-NiCr coatings during detonation spraying depends on the degree of filling the barrel with an explosive gas mixture. The degree of filling the barrel with an explosive gas mixture at 73% leads to a decrease in the content of carbide phases, and at 57% filling of the barrel, an increase in carbide phases is observed. It is established that the decrease of the filling degree leads to the increase of hardness and wear resistance of the Cr3C2-NiCr coatings since the hardness and wear resistance of the coating material deposited at 57% is higher than at 65% and 73%; this is due to the increase in the carbide phase Cr3C2. Detonation flame sprayed Cr3C2-NiCr gradient coatings have been developed in this study, which is carried out by varying the spray parameters. It was found that in the gradient coating, Cr3C2-NiCr carbide phases gradually increase from the depth to the surface. The obtained gradient coating closer to the substrate consists of the CrNi3 phase, while the coating surface consists of CrNi3 and Cr3C2 phases.

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“…20,21 The nickel-based coatings such as Ni 3 Ti and Cr 3 C 2 -25NiCr + Ni 3 Ti achieve better cohesion strength, less than 2% porosity in the coatings and coated samples with higher corrosion resistance than uncoated samples. 22,23 The NiCrBSi/flyash + Cr 2 O 3 , and NiCrBSi/flyash + Mo advanced coatings using the APS technique have higher microhardness and a lower coefficient of friction. 24 In this research, deposits by the HVOF technique are achieved within 2% of pores, and a dense microstructure of around 300 µm is obtained.…”

Section: Introductionmentioning

confidence: 99%

Hot-corrosion behaviour of CNT reinforced Cr₃C₂-NiCr coatings working under high-temperature sprayed by HVOF method

Kuruba¹,

Gaikwad²,

Shivalingappa³

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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The thermal power plant boiler tubes experience degradation of their surfaces due to oxidation and molten salt corrosion while working at elevated temperatures. The formation of protective coating layers can overcome such surface degradation. In the current research, protective coated layers composed of Cr3C2-25% NiCr/Carbon nanotube coatings are deposited on the ASTM SA-213T12 boiler tube substrate by the High-Velocity Oxy-Fuel (HVOF) thermal method. The coating powder Cr3C2-25%NiCr is reinforced with 3, 5 and 7 wt% of Multi-Wall Carbon Nano-Tube (MWCNT) prior to deposition. The uncoated and coated specimens are evaluated for hot corrosion behaviour in the molten salt environment (Na2SO4 + 60%V2O5) for 50 cycles, constituting 1 h of heating at 600 °C. Thermogravimetric analysis is used to investigate the kinetics of hot corrosion behaviour in both coated and uncoated samples. Coatings are characterized with the help of X-ray diffraction and Scanning Electron Microscope/Energy Dispersive Spectroscopy (SEM/EDS) techniques. Microstructural investigations with the help of SEM/EDS and X-ray diffraction of coated and uncoated samples revealed that 7 wt% of CNT coated samples minimized the voids and pores of the coatings, leading to better interlocking with the substrate surface. Furthermore, it is observed in the studies that the appreciable corrosion resistance of 7 wt% of CNT composite coatings is higher than 3 and 5 wt% of CNT-coated and uncoated samples.

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Microstructure and Adhesion Strength of Ni3Ti Coating Prepared by Mechanical Alloying and HVOF

Cited by 24 publications

References 25 publications

Hot corrosion behaviour of HVOF sprayed Ni₃Ti and Ni₃Ti + (Cr₃C₂ + 20NiCr) coatings in presence of Na₂SO₄-40%V₂O₅ at 650 °C

Hot corrosion behaviour of HVOF sprayed Ni₃Ti and Ni₃Ti + (Cr₃C₂ + 20NiCr) coatings in presence of Na₂SO₄-40%V₂O₅ at 650 °C

Influence of Spraying Parameters on the Structure and Tribological Properties of Cr3C2-NiCr Detonation Coatings

Hot-corrosion behaviour of CNT reinforced Cr₃C₂-NiCr coatings working under high-temperature sprayed by HVOF method

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Microstructure and Adhesion Strength of Ni3Ti Coating Prepared by Mechanical Alloying and HVOF

Cited by 24 publications

References 25 publications

Hot corrosion behaviour of HVOF sprayed Ni3Ti and Ni3Ti + (Cr3C2 + 20NiCr) coatings in presence of Na2SO4-40%V2O5 at 650 °C

Hot corrosion behaviour of HVOF sprayed Ni3Ti and Ni3Ti + (Cr3C2 + 20NiCr) coatings in presence of Na2SO4-40%V2O5 at 650 °C

Influence of Spraying Parameters on the Structure and Tribological Properties of Cr3C2-NiCr Detonation Coatings

Hot-corrosion behaviour of CNT reinforced Cr3C2-NiCr coatings working under high-temperature sprayed by HVOF method

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Product

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Hot corrosion behaviour of HVOF sprayed Ni₃Ti and Ni₃Ti + (Cr₃C₂ + 20NiCr) coatings in presence of Na₂SO₄-40%V₂O₅ at 650 °C

Hot corrosion behaviour of HVOF sprayed Ni₃Ti and Ni₃Ti + (Cr₃C₂ + 20NiCr) coatings in presence of Na₂SO₄-40%V₂O₅ at 650 °C

Hot-corrosion behaviour of CNT reinforced Cr₃C₂-NiCr coatings working under high-temperature sprayed by HVOF method