The Precious Metal Effect in High Temperature Corrosion

Wit, J.H.W. de; Manen, P.A. van

doi:10.4028/www.scientific.net/msf.154.109

Cited by 28 publications

(8 citation statements)

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“…It is well established that they exhibit better high temperature corrosion resistance than their Pt-free counterparts which translates into extended service lifetimes for thermal barrier coating systems (TBCs). 3,4 Investigations by Pint et al, 5,6 Nesbitt, Nagaraj, and Williams, 7 and Warnes 8 have provided compelling evidence which suggests that NiAl-based alloys containing small quantities of the reactive elements (RE) Hf or Zr added either in conjunction with or in place of Pt exhibit further improvements in TBC lifetime. This is further supported by Darolia and researchers at the General Electric Company who have developed and patented several new overlay coating and bond coat alloys that contain RE in addition to or in place of Pt.…”

Section: Introductionmentioning

confidence: 97%

Influence of processing variables on the properties of dc magnetron sputtered NiAl coatings containing Hf additions

Ning

Shamsuzzoha

Weaver

2004

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Section: Introductionmentioning

confidence: 97%

Influence of processing variables on the properties of dc magnetron sputtered NiAl coatings containing Hf additions

Ning

Shamsuzzoha

Weaver

2004

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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“…[5][6][7][8] The presence of Pt in the coating enhances the adherence of the alumina scale and, thereby, significantly improves the protective capability of the coating. [5,[9][10][11][12][13] The microstructural characteristics and oxidation behavior of PtAl bond coats were widely reported. [7,8,[14][15][16][17] PtAl bond coats are constituted of brittle b-(Ni,Pt)Al intermetallic phase and, typically, have a brittle-toductile transition temperature (BDTT) above 923 K (650°C).…”

Section: Introductionmentioning

confidence: 99%

Effect of Cyclic Oxidation Exposure on Tensile Properties of a Pt-Aluminide Bond-Coated Ni-Base Superalloy

Alam

Hazari

Varma

et al. 2011

Metall Mater Trans A

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The tensile behavior of a directionally solidified (DS) Ni-base superalloy, namely, CM-247LC, was evaluated in the presence of a Pt-aluminide bond coat. The effect of the thermal cycling exposure of the coated alloy at 1373 K (1100°C) on its tensile properties was examined. The tensile properties were evaluated at a temperature of 1143 K (870°C). The presence of the bond coating caused an approximately 8 pct drop in the strength of the alloy in the as-coated condition. However, the coating did not appreciably affect the tensile ductility of the substrate alloy. The bond coat prevented oxidation-related surface damage to the superalloy during thermal cycling exposure in air at 1373 K (1100°C). Such cyclic oxidation exposure (up to 750 hours) did not cause any further reduction in yield strength (YS) of the coated alloy. There was a marginal decrease in the ultimate tensile strength (UTS) with increased exposure duration. Because of the oxidation protection provided by the bond coat, the drastic loss in ductility of the alloy, which would have happened in the absence of the coating, was prevented.

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“…Most previous work in this area has focused from the substrate into the coating and scale, [17] and (5) suppression of void formation along the scale-metal interface. [18,19] However, all of the aforementioned mechanisms of Technology, Hoboken, NJ. P.K.…”

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

127

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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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The Precious Metal Effect in High Temperature Corrosion

Cited by 28 publications

References 0 publications

Influence of processing variables on the properties of dc magnetron sputtered NiAl coatings containing Hf additions

Influence of processing variables on the properties of dc magnetron sputtered NiAl coatings containing Hf additions

Effect of Cyclic Oxidation Exposure on Tensile Properties of a Pt-Aluminide Bond-Coated Ni-Base Superalloy

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

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