Oxide adhesion and growth characteristics on platinum-modified aluminide coatings

Farrell, Mark; Boone, D.H.; Streiff, R.

doi:10.1016/0257-8972(87)90098-3

Cited by 49 publications

(15 citation statements)

References 7 publications

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“…[7,8,9] More recently, a low-activity plati-(TBC) systems are comprised of two layers: (1) a strainnum aluminide coating, that exhibits a surface layer of sintolerant ceramic top coat (Y 2 O 3 -stabilized ZrO 2 (YSZ)) and gle-phase (Ni,Pt)Al instead of PtAl 2 or (PtAl 2 ϩ (Ni,Pt)Al) (2) a metallic bond coat, which typically consists of a plasmahas been developed via low-Al-activity CVD procsprayed NiCoCrAlY or a diffusion aluminide. The ceramic essing.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pt incorporation on the isothermal oxidation behavior of chemical vapor deposition aluminide coatings

Zhang

Haynes

Wright

et al. 2001

Metall Mater Trans A

126

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The effects of Pt incorporation on the isothermal oxidation and diffusion behavior of low-sulfur aluminide bond coatings were investigated. Aluminide (NiAl) coatings and Pt-modified aluminide (Ni,Pt)Al coatings were synthesized on a low-sulfur, yttrium-free single-crystal Ni-based superalloy by a high-purity, low-activity chemical vapor deposition (CVD) aluminizing procedure. The isothermal oxidation kinetics and scale adhesion behavior of CVD NiAl and (Ni,Pt)Al were compared at 1150 ЊC. Compositional profiles of alloying elements in the NiAl and (Ni,Pt)Al coatings before and after isothermal oxidation were determined by electron microprobe analysis. Platinum did not reduce oxidescale growth kinetics. No significant differences in bulk refractory metal (W, Ta, Re, and Mo) distributions were observed as a result of Pt incorporation. Spallation of the alumina scale and the formation of large voids along the oxide-metal interface were commonly observed over the NiAl coating grain boundaries after 100 hours at 1150 ЊC. In contrast, no spallation of Al 2 O 3 scales occurred on (Ni,Pt)Al coating surfaces or grain boundaries, although the sulfur content in the CVD (Ni,Pt)Al coatings was higher than that of the CVD NiAl coatings. Most significantly, no voids were observed at the oxide-metal interface on (Ni,Pt)Al coating surfaces or cross sections after 200 hours at 1150 ЊC. It was concluded that a major beneficial effect of Pt incorporation on an aluminide coatings oxidation resistance is the elimination of void growth at the oxide-metal interface, likely by mitigation of detrimental sulfur effects.

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Section: Introductionmentioning

confidence: 99%

Effects of Pt incorporation on the isothermal oxidation behavior of chemical vapor deposition aluminide coatings

Zhang

Haynes

Wright

et al. 2001

Metall Mater Trans A

126

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“…7(d), are identified as TiO 2 . The faceted grain morphology of the above oxide phase also indicates the phase to be rutile (TiO 2 ) 23 . Barring the boundary regions, the entire oxidised surface at 850 °C is covered with an alumina scale, as determined by EDS analysis as well as XRD study.…”

Section: Coated Alloymentioning

confidence: 99%

“…As mentioned before, IMI-834 alloy, like most Ti-alloys, forms a TiO 2 scale at all three oxidation temperatures. As a result, the parabolic oxidation would be controlled by the diffusion of the oxidising species (oxygen and/or Ti ions [20][21][22][23] ) through the TiO 2 scale. The activation energy of 43.9 kCal mole -1 calculated for this alloy, therefore, corresponds to the activation energy for the above diffusion process.…”

Section: Cyclic Oxidation Performancementioning

confidence: 99%

Aluminide Coatings on Titanium-based Alloy IMI-834 for High Temperature Oxidation Protection

Alam

Das

2011

DSJ

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Microstructural aspects and cyclic oxidation behaviour of plain aluminide and Pt-aluminide coatings on the near-a Ti-alloy IMI-834 have been studied. Both the coatings provide good oxidation resistance to the above alloy at 650 °C, 750 °C, and 850 °C. However, significant cracking develops in the coatings during coating formation as well as during cyclic oxidation exposure. The extent of cracking during oxidation is found to increase with the exposure temperature. Presence of through-thickness cracks in the coatings leads to localised oxidation damage of the underlying substrate at all the three temperatures. At 850 °C, such localised oxidation generates enough TiO 2 so that this oxide phase grows through the cracks and emerges at the sample surface forming a clearly identifiable mud-crack pattern. The extent of such oxidation damage is comparatively much lower at 750 °C and 650 °C.

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“…These coatings can be classified into three kinds: diffusion coatings [1][2][3], modified diffusion coatings [4][5][6][7], and MCrAlY coatings [8][9][10][11][12]. It is well known that the protective properties of these coatings depend on the formation of either an adherent oxide layer of Al 2 O 3 or Cr 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

Short‐term oxidation and hot corrosion resistance of a gradient CrN/Cr_1−xAl_xN coating

Zhu

et al. 2010

Materials & Corrosion

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A CrN/Cr 1Àx Al x N coating comprised of an inner layer of CrN and an outer layer of Cr 1Àx Al x N with a gradient distribution of Al was deposited on two different alloys by a reactive sputtering method. Oxidation and hot-corrosion tests of the gradient CrN/Cr 1Àx Al x N coating were performed at different temperatures. The phase compositions and morphologies of the as-deposited coating and the corrosion products were investigated by using XRD and SEM/EDS. The results showed that the gradient CrN/Cr 1Àx Al x N coating exhibited good oxidation resistance at temperatures above 1000 8C owing to the formation of an a-Al 2 O 3 -rich oxide scale. The coating possessed good hot-corrosion resistance in molten sulfate because the inner CrN layer could supply enough Cr to form a relatively protective Cr 2 O 3 after the Al 2 O 3 -enriched scale failed due to its dissolution in the molten sulfate.

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Oxide adhesion and growth characteristics on platinum-modified aluminide coatings

Cited by 49 publications

References 7 publications

Effects of Pt incorporation on the isothermal oxidation behavior of chemical vapor deposition aluminide coatings

Effects of Pt incorporation on the isothermal oxidation behavior of chemical vapor deposition aluminide coatings

Aluminide Coatings on Titanium-based Alloy IMI-834 for High Temperature Oxidation Protection

Short‐term oxidation and hot corrosion resistance of a gradient CrN/Cr_1−xAl_xN coating

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Oxide adhesion and growth characteristics on platinum-modified aluminide coatings

Cited by 49 publications

References 7 publications

Effects of Pt incorporation on the isothermal oxidation behavior of chemical vapor deposition aluminide coatings

Effects of Pt incorporation on the isothermal oxidation behavior of chemical vapor deposition aluminide coatings

Aluminide Coatings on Titanium-based Alloy IMI-834 for High Temperature Oxidation Protection

Short‐term oxidation and hot corrosion resistance of a gradient CrN/Cr1−xAlxN coating

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Short‐term oxidation and hot corrosion resistance of a gradient CrN/Cr_1−xAl_xN coating