Influence of silicon on the oxidation of titanium between 550 and 700�C

Chaze, Anne-Marie; Coddet, Christian

doi:10.1007/bf00656726

Cited by 61 publications

(63 citation statements)

References 8 publications

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“…Surface alloying seems to be more advantageous than bulk alloying, because silicon strongly modifies the mechanical properties of titanium. [3][4][5][6][7] Besides a reduction of the oxidation rate, [7][8][9][10][11][12] silicon has been shown also to improve wear 13,14 and creep 15 resistance.…”

Section: Introductionmentioning

confidence: 99%

Cyclic-Oxidation Resistance of Protective Silicide Layers on Titanium

Vojtěch¹,

Kubatík²,

Jurek

et al. 2005

Oxid Met

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Titanium was powder siliconized and gas nitrided, in order to improve its cyclic-oxidation resistance. Siliconizing was performed in a pure-silicon powder at temperatures in the range of 800-1100 • C for 3-48 h. Gas nitriding was carried out in pure N 2 at 1100 • C/12 h. Cyclic-oxidation experiments with the siliconized and nitrided samples were conducted in air at 850 and 950 • C for up to 560 h. It was found that the siliconized layers grew according to the parabolic law with the activation energy for siliconizing E S being 47.2 kJ mol −1 . Powder siliconizing at 900-1100 • C/3 h produced multi-phase layers, in which Ti 5 Si 3 silicide predominated The siliconizing temperature of 800 • C/3 h appeared to be insufficient, because it led to a non-uniform surface layer with a slight protective effect. The nitrided layers were composed of titanium nitride TiN and α-Ti(N) intestitial solid solution. Measurement of the oxidation kinetics revealed that the titanium siliconized at 900-1100 • C/3 h oxidized much more slowly than pure Ti, Ti-6Al-4V alloy and nitrided titanium. Microstructural investigation revealed the complex substructure of the scales on the siliconized samples which was composed of rutile+silica, rutile and nitrogen-rich sub-layers. The mechanism of high-temperature cyclic oxidation of the siliconized and nitrided titanium is discussed.

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Section: Introductionmentioning

confidence: 99%

Cyclic-Oxidation Resistance of Protective Silicide Layers on Titanium

Vojtěch¹,

Kubatík²,

Jurek

et al. 2005

Oxid Met

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“…According to 3 Si À 4E½TiðhcpÞ À E½Ti 5 Si 3 ¼ 0:143 eV. It means that the flow of such reaction is energetically unfavorable at 0 K.…”

Section: Formation Energies Of Ti-si Phases In A-ti At 0 Kmentioning

confidence: 99%

“…Titanium alloys containing even small amounts of Si show better corrosion resistance and mechanical properties compared with Si-free commercially pure titanium [1][2][3][4][5][6] and can be used as promising materials for medical implants [1]. Precipitation of the titanium silicides in the Ti-Si based alloys is one of the most important processes in the microstructure evolution during heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Ab initio-based prediction and TEM study of silicide precipitation in titanium

Poletaev¹,

Липницкий²,

Kartamyshev³

et al. 2014

Computational Materials Science

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a b s t r a c tThe literature contains many contradictory data about the most thermodynamically favorable structure of precipitates in a-Ti matrix of the hypoeutectoid Ti-Si alloys. In this work we applied our recently developed thermodynamic model to predict the structure of Ti-Si precipitates in a-Ti matrix of the TiSi alloy with total Si concentration of 0.7 wt.%. We considered all prominent Ti-Si phases such as Ti 3 Si; Ti 5 Si 3 ; Ti 5 Si 4 ; TiSi and two TiSi 2 phases and discovered that formation of the Ti 5 Si 3 phase is more favorable than that of the Ti 3 Si in contradiction with the known phase diagrams. Theoretical result was confirmed by experimental investigation of microstructure and phase composition of the model Ti-0.7Si alloy annealed at 873 K for 10 h. Indeed, the only observed phase has hexagonal Ti 5 Si 3 structure. To ensure the completeness of the results we calculated ab initio elastic constants for all considered Ti-Si phases.

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“…This scale, however, cannot prevent oxygen uptake, and accordingly the metal beneath the scale can dissolve sig-nificant amounts of oxygen, which can induce a consid-erable embrittlement of the metal underneath the oxide scale. The oxidation resistance of titanium can be enhanced by adding alloying elements such as Nb [1], Ta [2], Al [3], Si [4] or Cr [5]. The beneficial influence of Nb or Ta arises from the formation of a nitride layer in air which prevents oxygen dissolution in the metal substrate.…”

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confidence: 99%

Influence of yttria additions on the oxidation behaviour of titanium prepared by powder metallurgy

et al. 2009

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Abstract:The yttria dispersion effect on the oxidation resistance of titanium prepared by powder metallurgy has been evaluated between 700 and 900 °C. Yttria additions slightly increase the oxidation rate up to 800 °C and decrease it considerably at 900 °C. The mul tilayered rutile scale formed on pure titanium prepared by conventional techniques is replaced by a denser rutile scale in the case of titanium prepared by powder metallurgy. Yttria additions raise the temperature at which a more protective dense rutile scale is formed.

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Influence of silicon on the oxidation of titanium between 550 and 700�C

Cited by 61 publications

References 8 publications

Cyclic-Oxidation Resistance of Protective Silicide Layers on Titanium

Cyclic-Oxidation Resistance of Protective Silicide Layers on Titanium

Ab initio-based prediction and TEM study of silicide precipitation in titanium

Influence of yttria additions on the oxidation behaviour of titanium prepared by powder metallurgy

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