Microstructure and oxidation resistance of magnetron-sputtered nanocrystalline NiCoCrAlY coatings on nickel-based superalloy

Li, Zhiming; Qian, Shiqiang; Wang, Wei; Liu, Jihua

doi:10.1016/j.jallcom.2010.06.112

Cited by 33 publications

(4 citation statements)

References 21 publications

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“…Using bond coat of nanostructured Cr/Co–Al coatings on Superni-718 could increase the oxidation resistance as well as act as a diffusion barrier for the substrate element, which has been confirmed by XRD and EDS results. The lower oxidation rate of the nanostructured Cr/Co–Al coatings observed in the present work is in accordance with the results of Li et al 17 They have reported reduced oxidation rate for the sputtered nanocrystalline NiCoCrAlY coating.…”

Section: Resultssupporting

confidence: 93%

High temperature oxidation behaviour of Cr/Co–Al coated superalloy

Rahman

Chawla

Jayaganthan

et al. 2012

Surface Engineering

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The high temperature oxidation behaviour of nanostructured Cr/Co-Al coatings on Superni-718 substrate, deposited by sputtering, has been investigated. Cyclic high temperature oxidation tests were conducted on bare and coated samples at 900uC for up to 100 cycles. The results showed that a dense scale formed on the coated samples during thermal cycling at the peak temperature of 900uC. The external scale exhibited good spallation resistance during cyclic oxidation testing. The improvement in oxide scale spallation resistance is believed to be the fine grained structure of the coating. The Cr/Co-Al coating on the superalloy substrate showed better performance of cyclic high temperature oxidation resistance due to its possession of b-CoAl phase as Al reservoir and the formation of Al 2 O 3 and spinel phases, such as CoCr 2 O 4 and CoAl 2 O 4 , in the scale.

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Section: Resultssupporting

confidence: 93%

High temperature oxidation behaviour of Cr/Co–Al coated superalloy

Rahman

Chawla

Jayaganthan

et al. 2012

Surface Engineering

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“…According to the phase analysis, it mainly consists of (Cr, Fe) 2 O 3 , Ni(Cr, Al) 2 O 4 , FeCr 2 O 4 , NiCrO 3 . Usually, oxides such as Cr 2 O 3 , Al 2 O 3 grow slowly and have good stabilities at high temperature [15,16] , which is beneficial for the resistance of alloy. Fig.4 shows the SEM images of the oxidation products after 20 h. The EDS analysis reveals that they are rich of Cr, Fe, Ti, O.…”

Section: Discussion Of the Mechanismmentioning

confidence: 99%

Cyclic oxidation resistance of In718 superalloy treated by laser peening

Bai

Hua

Rong

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The aim of this study was to improve the cyclic oxidation resistance of In718 superalloy by laser peening(LP). Specimens were treated by LP from one to three times, respectively. The cyclic oxidation tests at 900 ℃ for periods up to 2 h were conducted. Changes of the top surface morphology and microstructure were analyzed by scanning electron microscope (SEM), energy-dispersive spectra (EDS), transmission electron microscope (TEM) and X-ray diffraction technique (XRD), respectively. The weights were measured between the oxidation cycles to assess the oxidation of the specimens. The top surface microstructure after LP was characterized by highly tangled and dense dislocation arrangements and a high amount of twins. Protective oxidation layer was generated more quickly on the surface treated by LP. The average oxidation rate was about 50 % lower. A tiny homogeneous oxidation layer containing (Fe,Cr) 2 O 3 , NiCrO 3 and Ni(Al,Cr) 2 O 4 spinel was generated on the surface. The experimental results of cyclic oxidation tests show that specimens treated by LP have a better high temperature oxidation resistance, and the antistrip performance of the oxidation layer improves. Moreover, the effects of LP are strengthened with the increase of laser peening.

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“…Physical vapour deposition (PVD) is one of the techniques in the alloys deposition processes [3]. PVD techniques can be used to deposit MCrAlY coatings; these include electron beam (EB-PVD) [4,5], magnetron sputtering (MS) [6] and cathodic arc deposition (CAD) [7,8]. In the CAD process, the difference between the chemical composition of the target and the coating is negligible; therefore, the alloys can be easily deposited [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effect of substrate temperature on the oxidation behaviour of NiCrAlY coating

Khakzadian

Hosseini

Madar

2020

Surface Engineering

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NiCrAlY coating was deposited on the IN-738LC Ni-based superalloy by cathodic arc deposition at the substrate temperatures of 400°C and 700°C. The effects of the substrate temperature on the microstructure and the isothermal oxidation behaviour of the coatings were then investigated. SEM image and XRD analysis were used to characterize the deposited coatings. It was found that when the substrate temperature was raised from 400°C to 700°C, the degree of coating crystallinity was increased from 23% to 58%. After the 20-hr oxidation at 1000°C in air, the γ ′ -depletion layer was formed in the substrate. The growth rate constants of the γ ′ -depletion layer after the 100-hr oxidation were 1.3×10 −4 μm (s b ) −1 and 6.4×10 −5 μm (s b ) −1 for the deposited coatings at 400°C and 700°C, respectively. The results, therefore, indicated that with increasing the substrate temperature from 400°C to 700°C, the oxidation resistance was improved.

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Microstructure and oxidation resistance of magnetron-sputtered nanocrystalline NiCoCrAlY coatings on nickel-based superalloy

Cited by 33 publications

References 21 publications

High temperature oxidation behaviour of Cr/Co–Al coated superalloy

High temperature oxidation behaviour of Cr/Co–Al coated superalloy

Cyclic oxidation resistance of In718 superalloy treated by laser peening

Effect of substrate temperature on the oxidation behaviour of NiCrAlY coating

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