Compositional effects on the high-temperature oxidation lifetime of MCrAlY type coating alloys

Salam, S.; Hou, P.Y.; Zhang, Y.-D.; Wang, H.-F.; Zhang, C.; Yang, Zhengang

doi:10.1016/j.corsci.2015.03.011

Cited by 75 publications

(11 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mutual infiltration of the coatings and TiAl alloy was rigorous. The interdiffusion of elements can induce to form brittle interlayer, and the new formation debases the adhesive force between coatings and substrate at high temperature [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior of Al-Y Coating on γ-TiAl at 900°C

et al. 2019

View full text Add to dashboard Cite

In this study, an Al-Y coating was applied to enhance the property of oxidation resistance on the surface of γ-TiAl alloys by rf magnetron sputtering. The isothermal oxidation tests were investigated at 900 °C for 100 h. The coating characteristics and microstructure of coating after isothermal oxidation were inspected by XRD and SEM methods respectively, and coating bonding strength was investigated by scratch tester. Results show that Al 2 O 3 and Y 2 O 3 were produced on the surface of γ-TiAl alloys to enhance oxidation resistance during the isothermal oxidation test. Diffusion layer with rich element of Al provides abundant Al to surface for formation of a continuous Al 2 O 3 layer which increases oxidation resistance effectively. Oxides of YAlO 3 and YAG were formed during the oxidation tests, which were beneficial for the strength, hardness and fracture toughness of crystal grain of Al 2 O 3. Furthermore, Element of Ti diffused into surface from substrate was restrained by Al because of the formation of TiAl 3 and TiAl, which avoid the layer-broken by titanium oxides with porous structure

show abstract

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior of Al-Y Coating on γ-TiAl at 900°C

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Among all of the reactive elements, Cerium's (Ce) effect on improving oxidation performance has drawn attention in recent years. It has been reported that the adherence of the oxide film formed on Ni-20Cr alloys is improved by small additions of Ce and Si near the formation of root-shape protrusions, which inhibits the propagation of cracks at the TGO and increases the spallation resistance [14,15]. On the other hand, substrate interdiffusion between the coating and the substrate also depletes the β phase, which is greatly dependent on coating composition, substrate composition, and oxidation temperature [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings

Zhang

Peng

et al. 2018

Coatings

View full text Add to dashboard Cite

MCrAlX (M: Ni or Co or both, X: minor elements) coatings have been used widely to protect hot components in gas turbines against oxidation and heat corrosion at high temperatures. Understanding the influence of the X-elements on oxidation behavior is important in the design of durable MCrAlX coatings. In this study, NiCoCrAlX coatings doped with Y + Ru and Ce, respectively, were deposited on an Inconel-792 substrate using high velocity oxygen fuel (HVOF). The samples were subjected to isothermal oxidation tests in laboratory air at 900, 1000, and 1100 • C and a cyclic oxidation test between 100 and 1100 • C with a 1-h dwell time at 1100 • C. It was observed that the coating with Ce showed a much higher oxidation rate than the coating with Y + Ru under both isothermal and cyclic oxidation tests. In addition, the Y + Ru-doped coating showed significantly lower β phase depletion due to interdiffusion between the coating and the substrate, resulting from the addition of Ru. Simulation results using a moving phase boundary model and an established oxidation-diffusion model showed that Ru stabilized β grains, which reduced β-depletion of the coating due to substrate interdiffusion. This paper, combining experiment and simulation results, presents a comprehensive study of the influence of Ce and Ru on oxidation behavior, including an investigation of the microstructure evolution in the coating surface and the coating-substrate interface influenced by oxidation time.

show abstract

“…So, an oxide scale can be formed on the coating, often referred to as a thermally grown oxide (TGO) layer which grows in either parabolic or sub-parabolic manner [7]. In fact, the composition and growth rate of the TGO layer varies according to the coating properties such as the chemical composition, microstructure, and oxides content [8]. These coatings have been manufactured by methods of physical vapor deposition (PVD) [9], magnetron sputtering [10], arc ion plating (AIP) [11], thermal spraying [12][13][14][15] and laser powder deposition (LPD) [16].…”

Section: Introductionmentioning

confidence: 99%

Study on production of modified MCrAlY powder with nano oxide dispersoids as HVOF thermal spray feedstock using mechanical milling

Zakeri

Ghadami

Rouhaghdam

et al. 2020

Mater. Res. Express

View full text Add to dashboard Cite

This paper investigates NiCoCrAlY-CeO 2 nanocomposite powders prepared by mechanical milling process. At first, micron-sized ceria powder was pre-milled to obtain nano-sized powders and then 1 wt% CeO 2 was mixed with the conventional NiCoCrAlY powder and milled under three sets of parameters. The conventional and milled powders were deposited on low carbon steel substrates by HVOF thermal spray technique. X-ray diffraction (XRD), scanning electron microscopy (SEM), fieldemission scanning electron microscopy (FESEM) and image analyzing method were used to characterize the prepared powders and coatings. Microstructural characterization showed that the milled powders underwent morphological and phase transitions. Through the microstructural and compositional analyses, it was found that a homogeneous distribution of CeO 2 nano-dispersoids in the NiCoCrAlY matrix was obtained. The resulting coatings showed that by using optimized milling parameters, required particle size and suitable morphology for thermal spray can be achieved.

show abstract

Compositional effects on the high-temperature oxidation lifetime of MCrAlY type coating alloys

Cited by 75 publications

References 41 publications

Oxidation Behavior of Al-Y Coating on γ-TiAl at 900°C

Oxidation Behavior of Al-Y Coating on γ-TiAl at 900°C

Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings

Study on production of modified MCrAlY powder with nano oxide dispersoids as HVOF thermal spray feedstock using mechanical milling

Contact Info

Product

Resources

About