Invited Review Paper in Commemoration of Over 50 Years of Oxidation of Metals: Alumina Scale Adhesion Mechanisms: A Retrospective Assessment

Smialek, James L.

doi:10.1007/s11085-021-10091-2

Cited by 26 publications

(5 citation statements)

References 115 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A wavy or fractured scale is associated with a substantial compressive stress induced by the thermal expansion mismatch with the underlying outer layer of the coating. While increased growth stress alone does not directly lead to spallation, it can contribute to the accumulation of long-term strain energy and eventual failure of adherent scales [33].…”

Section: Resultsmentioning

confidence: 99%

Cyclic oxidation of slurry silicide-aluminide coatings formed on Ti-6Al-4V alloy

Kochmańska,

Kochmański

2023

Surface Engineering

View full text Add to dashboard Cite

A proprietary slurry cementation method was used to produce silicide-aluminide coatings on alloy Ti-6Al-4V. The cementation processes were carried out at 900-1100 °C for 2-6 h. The coatings exhibited a stratified configuration characterised by a phase arrangement that demonstrates favourable attributes pertaining to mechanical and corrosion resistance capabilities, namely, the presence of aluminium-enriched phases at the coating surface and titanium-enriched phases proximity to the substrate. The cyclic oxidation behaviour at 800 °C for 30 twenty-two-hour cycles was investigated. The characterisation of the structure of coatings was carried out through the use of scanning microscopy, X-ray microanalysis, and Xray diffraction techniques. The coatings have excellent resistance to cyclic oxidation, resulting from the gradient structure and the establishment of a protective alumina layer on the surface. The coatings were characterised by good resistance to thermal shocks. The microcracks formed during thermal shocks were filled with an alumina, which renders the coatings self-healing.

show abstract

Section: Resultsmentioning

confidence: 99%

Cyclic oxidation of slurry silicide-aluminide coatings formed on Ti-6Al-4V alloy

Kochmańska,

Kochmański

2023

Surface Engineering

View full text Add to dashboard Cite

show abstract

“…The slope n of the dotted lines indicates the oxygen pressure dependency vs the parabolic oxidation rate constants ¶ log [V Al °°°] / ¶ log p O2 and ¶ log [V o °°] / ¶ log p O2 according to Eqs. [2] and [3]. Rate constants are given for Ni 3 Al, [19] NiAl, [10] NiAl + 0.1at pct Y at 1093 °C, [20] which each refer to a p O2 according, [21,22] NiAl + 0.05at pct Zr [23] and NiAl + 0.05 at pct Hf [14] given at 10 -37 atm.…”

Section: The Inherent Mechanisms Of Mass Transportmentioning

confidence: 99%

“…For example, innovative Ni-base superalloys for turbine blades are additionally optimized (0.1 ppmw S) using the process engineering method of melt desulfurization under a hydrogen atmosphere. [3] Analogous to the example given of rigorous control of sulfur levels in Al 2 O 3 -forming Ni-base alloys, most of current research on the reactive element effect is about optimizing its beneficial effects. Results have consistently shown that lifetime (alias scale adhesion) is affected by the type and amount of reactive elements in a given type of alloy.…”

Section: Introductionmentioning

confidence: 99%

The Reactive Element Effect

Fritscher

2022

Metall Mater Trans A

View full text Add to dashboard Cite

Rationalizing the reactive element effect operative in alumina- and chromia-forming alloys upon oxidation under oxidizing hot gas atmospheres, referring to investigations on zirconium oxide-coated test samples for gas turbine alloys. This retrospective study uses the results of cyclic furnace lifetime tests conducted at 1100 °C on ZrO2-coated Ni-base alloys with Y− or Y+ Hf-doped bond coats and correlates them with the parabolic oxidation rate constant at 1100 °C of binary NiAl alloys doped with Y, Zr, or Hf. Parallel results at higher temperatures allow the respective oxidation processes during the cyclic lifetimes to be assigned to cation-dominated or anion-dominated transport processes. The correlations document the close interrelationship between the refractory element content (Mo, Re, Ta, W) in the substrate alloy the total content of the two reactive elements Y and Zr in the mixed zone of the scale, representing a Me3+ iso-valence value individual relative lifetime parameters in pct for EBPVD thermal barrier coating systems associated with cation-dominated transport processes.

show abstract

“…The metal-oxide interface plays a critical role in broad applications ranging from heterocatalysis 1,2 , batteries 3,4 , and electronics 5,6 . The thermodynamics and kinetics of oxidation process have been extensively studied over the years [7][8][9] . Plenty of research has been focused on the metal's work function 10 , the transport of metal or oxygen species [11][12][13] , and the rate of oxidation 14 .…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional atomic interface between metal and oxide in Zr-ZrO2 nanoparticles

Zhou,

Zhang,

et al. 2024

Preprint

View full text Add to dashboard Cite

Metal-oxide interfaces with poor coherency have unique properties comparing to the bulk materials and offer broad applications in the fields of heterogeneous catalysis, battery, and electronics. However, current understanding of the three-dimensional (3D) atomic metal-oxide interfaces remains limited because of their inherent structural complexity and limitations of conventional two-dimensional imaging techniques. Here, we determine the 3D atomic structure of metal-oxide interfaces in zirconium-zirconia nanoparticles using atomic-resolution electron tomography. We quantitatively analyze the atomic concentration and the degree of oxidation, and find the coherency and translational symmetry of the interfaces are broken. Moreover, we observe porous structures such as Zr vacancies and nano-pores and investigate their distribution. Our findings provide a clear 3D atomic picture of metal-oxide interface with direct experimental evidence. We anticipate this work could encourage future studies on fundamental problems of oxides such as interfacial structures in semiconductor and atomic motion during oxidation process.

show abstract

Invited Review Paper in Commemoration of Over 50 Years of Oxidation of Metals: Alumina Scale Adhesion Mechanisms: A Retrospective Assessment

Cited by 26 publications

References 115 publications

Cyclic oxidation of slurry silicide-aluminide coatings formed on Ti-6Al-4V alloy

Cyclic oxidation of slurry silicide-aluminide coatings formed on Ti-6Al-4V alloy

The Reactive Element Effect

Three-dimensional atomic interface between metal and oxide in Zr-ZrO2 nanoparticles

Contact Info

Product

Resources

About