Role of nitrogen on the oxidative stability of Ti5Si3 based alloys at elevated temperature

Tang, Zhizhong; Thom, Andrew J.; Akinç, Müfit

doi:10.1016/j.intermet.2005.09.006

Cited by 23 publications

(18 citation statements)

References 19 publications

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“…The outer TiO 2 scale grew simultaneously. During high temperature exposure to air no formation of nitrides on the titanium silicide was observed, as reported elsewhere [34]. Despite of the formation of mainly titania the oxidation resistance of the titanium silicide coatings was excellent.…”

Section: Si-based Coatingssupporting

confidence: 84%

Oxidation protective coatings for γ‐TiAl – recent trends

Fröhlich¹,

Ebach-Stahl

Braun

et al. 2007

Materialwissenschaft Werkst

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Engine designers show continued interest in c-TiAl based titanium aluminides as light-weight structural materials to be used at moderately elevated temperatures. Although alloy development has made significant progress in terms of mechanical properties and environmental resistance, protective coatings have been developed that help to extend the lifetime of these alloys significantly. The major challenge of coating development is to prevent the formation of fast growing titania. Furthermore, changes of coating chemistries at high temperatures have to be considered in order to avoid rapid degradation of the coatings due to interdiffusion between substrate and coating.The paper describes recent work of the authors on different coatings produced by means of magnetron sputter technique. Thin ceramic Ti-Al-Cr-Y-N layers tested at 900 C exhibited poor oxidation resistance. In contrast, intermetallic Ti-Al-Cr, Si-based and aluminum rich Ti-Al coatings were tested at exposure temperatures up to 950 C for 1000h resulting in reasonable and partially excellent oxidation behaviour.Keywords Dieser Artikel beschreibt aktuelle Arbeiten der Autoren an unterschiedlichen Schichtsystemen, die mittels Magnetron-Sputtern hergestellt wurden. Dünne keramische Ti-Al-Cr-Y-N -Schichten zeigten einen geringen Oxidationswiderstand bei einer Testtemperatur von 900 C. Dagegen wurden intermetallische Ti-Al-Cr-, Sibasierte und aluminiumreiche Ti-Al -Schichten bis zu 950 C Auslagerungstemperatur 1000h lang getestet mit gutem und teilweise exzellentem Oxidationsverhalten als Ergebnis.

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Section: Si-based Coatingssupporting

confidence: 84%

Oxidation protective coatings for γ‐TiAl – recent trends

Fröhlich¹,

Ebach-Stahl

Braun

et al. 2007

Materialwissenschaft Werkst

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“…Much research is currently focused on the development of titanium silicide protective coatings on structural materials, in order to improve the oxidation resistance of these materials [5,6]. In a recent work [7], it has been shown in Ti 5 Si 3 that nitrogen was responsible for the increased oxidation in air above 1000 C, which can limit some of its high-temperature applications.…”

Section: Introductionmentioning

confidence: 99%

Nitriding study of titanium silicide intermetallics obtained by mechanical alloying

et al. 2008

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“…12 The transport of cations and anions proceeds in the bulk of the rutile phase formed, along the TiO 2 -Ti 5 Si 3 phase boundaries, and along the grain boundaries of TiO 2 , which are numerous, because the original, lm-size TiN grains in the composite were refined into submicrometer-size TiO 2 particles during oxidation. It is worthwhile noting that the air-oxidation mechanism of the TiN-Ti 5 Si 3 composite is similar to that of Ti- (2,8) wt.% Si alloys. 10 Here, the outer rutile scale grows by the outward diffusion of Ti, while the inner (SiO 2 , TiO 2 )-mixed scale grows by the inward diffusion of oxygen.…”

Section: Resultsmentioning

confidence: 83%

“…7,8 Ti 5 Si 3 oxidizes to TiO 2 and silica. [7][8][9] If the silica formed a layer on the surface, the oxidation of Ti 5 Si 3 would be slowed down, because the diffusion coefficient of oxygen in silica is considerably lower than that in rutile. Instead of forming a silica layer, if Si were dissolved in TiO 2 preferably in the interstitial positions in the rutile lattice, the concentration of the oxygen vacancies that are responsible for the oxygen diffusion in TiO 2 would be decreased.…”

Section: Resultsmentioning

confidence: 99%

High-Temperature Oxidation of TiN-Ti5Si3 Composites Prepared by Polymer Pyrolysis

Lee

Kim

2006

Oxid Met

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Composites consisting of a TiN matrix containing about 32 vol.% Ti 5 Si 3 were synthesized via polymer pyrolysis, and oxidized in the temperature range of 700 to 900°C for up to 120 h in air. Oxidation occurred mainly in the TiN matrix, because Ti 5 Si 3 was resistant to oxidation. The oxidation of the TiN matrix was preceded by the outward diffusion of Ti ions to form an outer TiO 2 layer, and the inward diffusion of oxygen ions to form an inner TiO 2 layer, together with nitrogen evolution from the TiN matrix.

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Role of nitrogen on the oxidative stability of Ti5Si3 based alloys at elevated temperature

Cited by 23 publications

References 19 publications

Oxidation protective coatings for γ‐TiAl – recent trends

Oxidation protective coatings for γ‐TiAl – recent trends

Nitriding study of titanium silicide intermetallics obtained by mechanical alloying

High-Temperature Oxidation of TiN-Ti5Si3 Composites Prepared by Polymer Pyrolysis

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