Degradation of the platinum aluminide coating on CMSX4 at 1100 °C

Chen, J.H.; Little, J. A.

doi:10.1016/s0257-8972(96)03117-9

Cited by 105 publications

(58 citation statements)

References 11 publications

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“…The Al and Ni contents revealed by EDS microanalyses suggest the major formation of a NiAl phase in this area, which is confirmed by XRD. Beneath the additive layer, the interdiffusion layer appears as a result of the countercurrent diffusion of Al being transported inwardly and the substrate elements diffusing outwardly [8,11]. A 30 μm thick layer is then developed.…”

Section: 1-materials Of Studymentioning

confidence: 99%

Soft chemical stripping of aluminide coatings and oxide products on Ni superalloys

Poupard¹,

Martínez²,

Pedraza³

2008

Surface and Coatings Technology

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Section: 1-materials Of Studymentioning

confidence: 99%

Soft chemical stripping of aluminide coatings and oxide products on Ni superalloys

Poupard¹,

Martínez²,

Pedraza³

2008

Surface and Coatings Technology

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“…The beneficial effect of platinum on the capability of NiAl coatings to form a protective alumina scale at high temperature has been reported in many papers [1][2][3][4][5][6][7][8][9]. According to the literature, the improvement of the oxidation performance of ß-NiAl coatings through Ptadditions is mainly achieved due to the enhancement of the alumina scale adherence to the substrate [3,4] and to the ability of the alloy to selectively form a pure Al 2 O 3 scale even after oxide scale failure during high temperature exposure [5].…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, very little data is available in the literature to determine this value which is critical for the development of new coatings with improved oxidation and thermomechanical fatigue life (TMF). Indeed, as it has been shown that mechanical performance is strongly linked to chemical composition [6,9], it appears that the optimisation of the coating chemical composition is not only a key issue in the improvement of the oxidation resistance but also in TMF performance. Thus, efforts to determine the influence of the Pt-content within NiAl coatings were started.…”

mentioning

confidence: 99%

Performance and thermal stability of Pt-modified Al-diffusion coatings for superalloys under cyclic and isothermal conditions

Littner¹,

Pedraza²,

Kennedy³

et al. 2005

Materials at High Temperatures

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bstract: A per, the influence of the platinum content on the cyclic oxidation resistance at In this pa 1150°C of Pt-aluminide coatings deposited on a single crystal Ni-based superalloy is reported. The different coatings involve the well-known bi-phase (Ni,Pt)Al and PtAl 2 as well as single phase (Ni,Pt)Al coatings with various compositions and microstructures. The results showed that the cyclic oxidation performance depends strongly on the average Pt-content present in the coating and, to a lesser extent, on the coating microstructure. Moreover, no relevant effect of the Al content could be evidenced. Surface deformation occurred during exposure and was attributed to phase transformations within the coating. This assumption was confirmed by isothermal experiments between 1050 and 1200°C. Post-experimental investigations of tested specimens were performed by optical and scanning electron microscopy, X-ray diffraction and EPMA. INTRODUCTIONThe beneficial effect of platinum on the capability of NiAl coatings to form a protective alumina scale at high temperature has been reported in many papers [1][2][3][4][5][6][7][8][9]. According to the literature, the improvement of the oxidation performance of ß-NiAl coatings through Ptadditions is mainly achieved due to the enhancement of the alumina scale adherence to the substrate [3,4] and to the ability of the alloy to selectively form a pure Al 2 O 3 scale even after oxide scale failure during high temperature exposure [5]. The mechanism whereby Pt additions allow such an improvement of oxidation performance is however still not well understood.Many possibilities such as the decrease of growth stresses in the oxide layer, the anchoring of the alumina scale by the formation of oxide pegs, the augmentation of the Al-diffusivity [5][6][7] have been suggested but have not been unanimously accepted. Moreover there is a lack of data concerning the influence of the Pt-concentration on the oxidation behaviour of the coatings. It has been shown that a minimum Pt-content in the coating should be necessary to ensure the beneficial effects of Pt [10]. Unfortunately, very little data is available in the literature to determine this value which is critical for the development of new coatings with improved oxidation and thermomechanical fatigue life (TMF). Indeed, as it has been shown that mechanical performance is strongly linked to chemical composition [6,9], it appears that the optimisation of the coating chemical composition is not only a key issue in the improvement of the oxidation resistance but also in TMF performance. Thus, efforts to determine the influence of the Pt-content within NiAl coatings were started.Five Pt-modified coatings with different chemical compositions were tested under isothermal and thermocyclic conditions. The investigations were also focused on the influence of the Alconcentration and of the coating microstructure with regard to the cyclic oxidation resistance. EXPERIMENTAL MaterialsThe substrate material used to deposit the coatings was the PWA 148...

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“…However, the increase in operating temperature for current turbine systems has brought about serious problems, such as the acceleration of inter-diffusion between substrates and bondcoats, which may promote the precipitation of detrimental phases in the substrates, and the rapid growth of a thermally grown oxide (TGO) on the bond-coat surface [4,5]. This leads to further enhancement of the top-coat spallation [2,3] and accordingly shortens the service life of TBCs. Development of novel bond coat materials will thus be essential in realizing next-generation gas turbines or jet engines.…”

Section: Introductionmentioning

confidence: 99%

High temperature characteristics of Ir–Ta coated and aluminized Ni-base single crystal superalloys

Suzuki

Murakami

et al. 2004

Science and Technology of Advanced Materials

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High temperature oxidation and hot corrosion properties of Ir-Ta coated and aluminized Ni-base superalloys are presented. An Ir-Ta binary alloy, proposed as a novel metallic bond coat material, was coated on a Ni-base single crystal superalloy TMS-75 using electron beam physical vapor deposition, followed by a conventional low activity Al pack cementation process. Cyclic oxidation tests and hot corrosion tests revealed that these Ir-Ta coated and aluminized specimens showed reasonably good oxidation and hot corrosion resistance. In addition, it was found that the formation of TCP phases is suppressed by the presence of the Ir -Ta enriched layer. These results indicated that the Ir-Ta alloy system is promising as a new metallic bond coat material for high temperature structural materials. q

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Degradation of the platinum aluminide coating on CMSX4 at 1100 °C

Cited by 105 publications

References 11 publications

Soft chemical stripping of aluminide coatings and oxide products on Ni superalloys

Soft chemical stripping of aluminide coatings and oxide products on Ni superalloys

Performance and thermal stability of Pt-modified Al-diffusion coatings for superalloys under cyclic and isothermal conditions

High temperature characteristics of Ir–Ta coated and aluminized Ni-base single crystal superalloys

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