Computer modelling the diffusion of Ni in NiO at high temperatures

Li, H.; Czerwiński, F.; Zhilyaev, Alexander P.; Szpunar, Jerzy A.

doi:10.1016/s0010-938x(97)00021-8

Cited by 18 publications

(11 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, oxides grown on the (001) face, which also have an epitaxial relationship (i.e., (001) Ni ||(111) NiO ), form more grain boundaries because there are four oxide alignments possible [3,5,6]. A higher concentration of grain boundaries, which are known to exhibit higher diffusivities than the bulk [15], is responsible for the observed differences in oxidation rate. More recent studies have estimated the grain boundary character distribution in NiO based on experimentally determined orientation distribution functions of the oxide [8,16].…”

Section: Introductionmentioning

confidence: 99%

“…In both Cu, Ni and their alloys, the oxidation mechanism and effects of orientation depend on temperature [1,2,4,[21][22][23][24]. The grain size of the oxide has also been shown to lead to different oxidation rates in polycrystalline Ni [15,25]. Furthermore, oxidation behavior depends on the crystal structure of the material (e.g., different results are found in face-centered and body-centered cubic metals).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of crystallographic orientation on the early stages of oxidation in nickel and chromium

Bonfrisco

Frary

2009

J Mater Sci

View full text Add to dashboard Cite

Surface orientation plays an important role in the oxidation behavior of single crystals where studies have found the relative oxidation rates for surfaces with different orientations. However, most materials are polycrystalline and contain myriad orientations that contribute to the overall oxidation process. Here we determine the effects of orientation on the early stages of oxidation behavior as a function of surface orientation for polycrystalline nickel (face-centered cubic) and chromium (body-centered cubic). After high temperature oxidation, the oxide topography is characterized using optical profilometry and the underlying microstructure is characterized with electron backscatter diffraction (EBSD). By correlating results from EBSD and optical profilometry, the oxide height is determined for each crystallographic orientation. In both Ni and Cr, a strong relationship is observed between the oxidation rate and direction of the surface normal; for Ni, (111) surfaces oxidize slowest, while (100) surfaces in Cr have the lowest oxidation rates. Although orientation-dependent oxidation rates are observed at short times, the effect is diminished at longer oxidation times.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of crystallographic orientation on the early stages of oxidation in nickel and chromium

Bonfrisco

Frary

2009

J Mater Sci

View full text Add to dashboard Cite

show abstract

“…It is clear that the diffusivity of oxide grain boundaries is affected by their structure. The sharp crystallographic texture will lead to higher proportion of grain boundaries with low diffusivity (Li et al, 1997). In particular, the proximity of grain boundaries to a coincidence orientation will have an important influence on the diffusion rate.…”

Section: Role Of Grain Boundary Structure In Oxide Growthmentioning

confidence: 99%

Texture in Metallic and CeramicFilms and Coatings

Czerwiński

Szpunar

1997

Texture, Stress, and Microstructure

Self Cite

View full text Add to dashboard Cite

The properties of films and coatings can be optimized for a variety of applications by modifying their texture. Understanding how the texture in thin films is formed and how it can be controlled during film growth process is one of the most important areas of texture research. Several examples were selected to illustrate how the texture in films and coatings is developed and to explain how various properties of films are affected by texture. In particular, texture development during electrodeposition of Zn-based automobile coatings, Ni and Ni-based layers for magnetic recording as well as Fe and Fe-based wearresistant coatings, is presented. A new area of application oftexture research to control the high-temperature oxidation resistance of engineering materials is described. Using experimental data for Ni and Ti, the factors affecting texture formation during growth of ceramic oxides are discussed, with special attention paid to the role of substrate texture. The correlation between the oxide texture, grain boundary structure and diffusion of metal and oxygen ions at high temperatures, is considered.

show abstract

“…The microstructure of the NiO scales developed on untreated nickel samples have shown the formation of cellular oxides at either 700 and 800° C. Nonetheless, more apparent coverage on certain grains of this untreated substrate is observed especially at 700° C as a direct result of the relatively textured initial structure of the as-received nickel, but oxide growth anisotropy is anyhow a well known feature of NiO oxides[35][36][37][38]. However, at 800° C some isolated areas contained platelets growing outwardly from the cellular oxide scale.…”

mentioning

confidence: 98%

High-temperature oxidation behavior of low-energy high-flux nitrided Ni and Ni–20% Cr substrates

Pedraza

Reffass

Balmain

et al. 2003

Materials Science and Engineering: A

View full text Add to dashboard Cite

Nitridation at low energy-high flux implantation-diffusion has been performed on pure Ni and Ni20Cr substrates in order to study their high temperature oxidation behaviour at 700 and 800° C in synthetic air. The nitridation treatment has led to significant sputtering on pure Ni, but no implanted nitrogen has been detected. On the contrary, the Ni20Cr substrates are able to incorporate nitrogen, with less sputtered surfaces. Porosity is anyhow found on both substrates after the nitridation treatment. No particular difference is found to occur on the oxidation kinetics of Ni specimens but on their scales morphology. On the contrary, in Ni20Cr specimens, oxidation is enhanced mainly upon the first exposure times owing to trapping of chromium by the implanted nitrogen. Furthermore, the expanded austenite γ N layer formed on the nitrided Ni20Cr samples is stable up to 700°C for 24 h, after which evolution towards the nitride precipitation occurs.

show abstract

Computer modelling the diffusion of Ni in NiO at high temperatures

Cited by 18 publications

References 6 publications

Effects of crystallographic orientation on the early stages of oxidation in nickel and chromium

Effects of crystallographic orientation on the early stages of oxidation in nickel and chromium

Texture in Metallic and CeramicFilms and Coatings

High-temperature oxidation behavior of low-energy high-flux nitrided Ni and Ni–20% Cr substrates

Contact Info

Product

Resources

About