Sulfidation properties of TiAl–2 at.% X (X=V, Fe, Co, Cu, Nb, Mo, Ag and W) alloys at 1173 K and 1.3 Pa sulfur pressure in an H2S–H2 gas mixture

Izumi, Takeshi; Yoshioka, Takayuki; Hayashi, Shigenari; Narita, Toshio

doi:10.1016/s0966-9795(00)00028-5

Cited by 24 publications

(8 citation statements)

References 36 publications

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“…The oxidation behaviour of binary TiAl and TiAl based alloys with modifying elements is generally well established. Alloying additions, such as Mo, Nb, Hf, Zr, Cr or W enhance oxidation resistance and V, Mn, and Cr improve ductility [1][2][3][4][5][6]. The role of Ag during oxidation of γ-TiAl base alloys is to promote long-term formation of protective alumina scales [6] and thus improvement of the oxidation resistance, as well as alloy ductility.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the composition of the alloy and H 2 O content in the oxidizing atmosphere the overall oxidation rate and composition and morphology of the oxide scale can change (TiO 2 , TiO 2 + Al 2 O 3 or Al 2 O 3 ). There is some information on high temperature sulphidation of TiAl and TiAl-based alloys in H 2 S−H 2 gas mixture and sulphur vapour atmospheres [1][2][3][4][5]9]. Sulphidation properties of the binary TiAl and ternary arc-melted TiAl-2X alloys (X = V, Fe, Co, Cu, Nb, Mo, Ag, W, Cr, Si, Mn, Ni, Ge, Y, Zr, La, Ta) at 1173 K in H 2 S-H 2 gas mixture were investigated by Narita et al [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…There is some information on high temperature sulphidation of TiAl and TiAl-based alloys in H 2 S−H 2 gas mixture and sulphur vapour atmospheres [1][2][3][4][5]9]. Sulphidation properties of the binary TiAl and ternary arc-melted TiAl-2X alloys (X = V, Fe, Co, Cu, Nb, Mo, Ag, W, Cr, Si, Mn, Ni, Ge, Y, Zr, La, Ta) at 1173 K in H 2 S-H 2 gas mixture were investigated by Narita et al [1][2][3][4]. Particular attention was paid to the structure of the alloy surface layers and the sulphidation properties of the studied alloys.…”

Section: Introductionmentioning

confidence: 99%

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High Temperature Corrosion of TiAl - 2-5At-%X (X=Ag,Cr,Nb) Alloys in SO2 and H2S-H2 Atmospheres

Przybylski¹,

Brylewski²,

Stawiarski³

et al. 2004

MSF

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The sulphidation and oxidation behaviour of Ar-arc-melted Ti-50Al, Ti-49Al-2Nb, Ti-49Al-2Ag, Ti-48Al-3Ag-5Cr and Ti-52Al-3Ag-5Cr alloys were studied at 1173 K in SO 2 atmosphere (100 kPa) and in H 2 S-H 2 gas mixture (pS 2 =1Pa) up to 39 hrs. Comparison of the influence of the applied sulphidizing atmosphere and addition of the third and fourth alloying element (Nb, Cr, Ag) to binary TiAl alloy on sulphidation and oxidation kinetics, microstructure, composition and growth mechanism of the scales formed on the above alloys were investigated. It was found that sulphidation and oxidation reactions followed a parabolic or para-linear rate laws. Investigations in SO 2 revealed that TiAlAg alloy is much less resistible to the exposured atmosphere in comparison with other alloy compositions, caused probably by an Al-Ag liquid phase formation. Investigations in H 2 S-H 2 show that TiAlAg and TiAlAgCr alloys sulphidize faster than TiAl and TiAlNb alloys due to formation of an Al-Ag liquid phase on the surface of these alloys. A significant influence of Ag, Nb and Cr additions to TiAl alloy on the microstructure and composition of the formed mixed oxide/sulphide (in SO 2 ) and sulphide (in H 2 S−H 2 ) scales and alloy surface layers was observed. The scales obtained in both atmospheres were multilayered and heterogenous and these formed in SO 2 were composed of TiO 2 , Al 2 O 3 , TiS and Al 2 S 3 , while those in H 2 S-H 2 of Ti 3 S 4 , TiS 1.5 , TiS and Al 2 S 3 . Marker experiments using platinum were performed in order to obtain information about the growth mechanism of scales in both atmospheres used.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Temperature Corrosion of TiAl - 2-5At-%X (X=Ag,Cr,Nb) Alloys in SO2 and H2S-H2 Atmospheres

Przybylski¹,

Brylewski²,

Stawiarski³

et al. 2004

MSF

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“…Moreover its coefficient of expansion closely matches to TiAl matrix [11,12]. Additionally, the refractory elements such as Nb, Mo, Cr, have also been added to TiAl alloy to enhance the ductility at room temperature and elevated temperature strength [13,14].…”

Section: Introductionmentioning

confidence: 94%

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Al2O3/TiAl In-Situ Composites

Liu

Wang

Zhu

et al. 2011

MSF

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Al2O3/TiAl composites were successfully fabricated by hot-press-assisted exothermic dispersion method with powder mixtures of Ti, Al, TiO2and Cr2O3as raw materials. The effect of sintering temperature on the microstructures and mechanical properties of Al2O3/TiAl composites has been investigated. The results show that the Rockwell hardness and density of the composites increased with increasing sintering temperature. But the flexural strength and fracture toughness peaked at 825 MPa and 7.29 MPa·m1/2, respectively, when the sintering temperature reached to1300 °C.

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“…Ti64-sulfur interaction. Several studies exist for the sulfidation of Ti64 and other alloys in the presence of gaseous H 2 S or SO 2 [7][8][9][10][11]; however, to the authors best knowledge, no literature exists on the sulfidation of Ti64 with elemental sulfur. This work aimed to fill that knowledge gap.…”

Section: Introductionmentioning

confidence: 99%

Sulfidation kinetics of titanium and Ti-6Al-4V with elemental sulfur

Raikar

DiGregorio

Hildreth

2023

Corrosion Engineering, Science and Technology

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The sulfidation kinetics of titanium and Ti-6Al-4V (Ti64) using elemental sulfur were studied by measuring the amount of metal consumed instead of the change in mass or scale thickness. This metal consumption approach combines the parabolic oxidation law, Arrhenius equation, and Pilling-Bedworth ratio to determine the apparent activation energy and the pre-exponential factor of consumption of Ti64 during sulfidation. The estimations of apparent activation energy and preexponential factor were 110.4 kJ•mol −1 and 1.3 × 10 −9 m 2 s −1 for the titanium-sulfur, and 116.2 kJ•mol −1 and 1.2 × 10 −9 m 2 s −1 for the Ti64-sulfur system. Finally, a material removal predictor was developed to predict the amount of Ti64 consumed for a given sulfidation temperature and time.

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Sulfidation properties of TiAl–2 at.% X (X=V, Fe, Co, Cu, Nb, Mo, Ag and W) alloys at 1173 K and 1.3 Pa sulfur pressure in an H2S–H2 gas mixture

Cited by 24 publications

References 36 publications

High Temperature Corrosion of TiAl - 2-5At-%X (X=Ag,Cr,Nb) Alloys in SO<sub>2</sub> and H<sub>2</sub>S-H<sub>2</sub> Atmospheres

High Temperature Corrosion of TiAl - 2-5At-%X (X=Ag,Cr,Nb) Alloys in SO<sub>2</sub> and H<sub>2</sub>S-H<sub>2</sub> Atmospheres

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Al<sub>2</sub>O<sub>3</sub>/TiAl <i>In-Situ</i> Composites

Sulfidation kinetics of titanium and Ti-6Al-4V with elemental sulfur

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