Bond Coat Development for Thermal Barrier Coatings

Wortman, David; Duderstadt, E. C.; Nelson, Warren A.

doi:10.1115/1.2906199

Cited by 12 publications

(3 citation statements)

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“…To perform comparative assessment of oxidation resistance of the studied filler materials CMSX-4 alloy samples with deposited beads were tested for cyclic oxidation in CM FURNACES Bloomfield-1710BL (c) unit in the following mode: heating up to 1150 °C for 5 min + soaking at maximum temperature for 50 min + cooling to 50 °C for 5 min [3]. This mode is used for assessment of thermal-fatigue life of coated samples.…”

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Fatigue life of deposited repair welds on single-crystal high-temperature nickel alloy under cyclic oxidation

Belyavin¹,

Kurenkova²,

Fedotov³

2014

The Paton Welding J.

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In modern gas-turbine units increase of gas working temperature leads to shortening of blade service life. For this reason their repair becomes a priority. Retailoring of single-crystal blade tip by hardfacing is a rather complicated task. In order to select suitable filler material, thermal cycling tests of samples of deposited welds on CMSX-4 alloy with a single-crystal structure have been performed. Evolution of the structure under the conditions of high-temperature cyclic oxidation is considered. Selection of filler material, which ensures high temperature resistance and stability of weld metal structure, was optimized. These requirements are satisfied by Co-Ni-based material, which was earlier tried out and proved to be very good in complex technology of repair of a blade from ZMI-3U alloy. The technology includes airfoil tip retailoring by hardfacing with subsequent deposition on the item surface of a high-temperature metal coating by electron beam deposition to ensure the required service properties of the item. 18 Ref., 4 Tables, 10 Figures.

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confidence: 99%

Fatigue life of deposited repair welds on single-crystal high-temperature nickel alloy under cyclic oxidation

Belyavin¹,

Kurenkova²,

Fedotov³

2014

The Paton Welding J.

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“…Maintaining the integrity of the bond coat is crucial to ensuring the TBC operates reliably. Of particular importance is the creep performance of the MCrAlY bond coat [2] and it has been shown that creep resistant bond coats improve TBC thermal cycle life [5]. MCrAlY bond coats typically consist of fcc Ni(Co)-γ-phase, bcc B2 NiAl-β-phase, ordered Ni 3 (Al,Ti) γ' phase and CrCo σ phase [3,[6][7][8][9][10][11][12].…”

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The High Temperature Creep Properties of a Thermally Sprayed CoNiCrAlY Coating via Small Punch Creep Testing

Jackson

Chen

Sun

et al. 2017

KEM

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Thermal barrier coatings (TBC’s) protect superalloy components from excessively high temperatures in gas turbines. TBC’s comprise of a ceramic top coat, a metallic bond coat and a thermally grown oxide (TGO). The creep behaviour of the MCrAlY bond coat, which is sensitive to the composition and the method of deposition, has a significant effect on the life of the TBC. High velocity oxy-fuel (HVOF) thermal spraying is a popular deposition method for MCrAlY bond coats however the creep properties of HVOF MCrAlY coatings are not well documented. The creep behaviour of a HVOF thermally sprayed CoNiCrAlY coating has been determined by small punch creep (SPC) testing. Tests were conducted between an equivalent uniaxial stress range of 37-80 MPa at 750 °C on two different SPC rigs and between 30-49 MPa at 850 °C on a single SPC rig. The measured steady-state creep deformation rates at 750 °C were consistent across the two rigs. A comparison with previous work demonstrated that the creep behaviour of HVOF CoNiCrAlY coatings is not sensitive to the manufacturing variability associated with HVOF thermal spraying. The CoNiCrAlY coating exhibited typical SPC deformation at 750 °C. At 850 °C the CoNiCrAlY coating showed significantly different creep behaviour which could be attributed to the onset of superplasticity.

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“…This behaviour may be due to interfacial oxidation or the formation of brittle interfacial phases [39]. In cases where such a deleterious reaction occurs between coating and substrate (or with an impurity which can diffuse to and react at the interface) a bonding layer can be deposited as a diffusion barrier to improve performance.…”

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Interfaces and Adhesion

Bull

1992

Eurocourses: Mechanical and Materials Science

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ABSTRACT. In most applications the mmImum criterion for adequate coating performance is that it remains attached to the substrate over the lifetime of the component. Control of the factors affecting adhesion is thus essential and this equates to careful control of the structure and composition of the interfacial layers if the best performance of the coating is to be achieved. Practical adhesion is a macroscopic property which depends on chemical and mechanical bonding at the interface, residual stress and the presence of any stresses imposed by the application and the mechanism of interfacial failure which depends on the coating and substrate materials and the working environment. In this paper the mechanisms of adhesion and how these relate to interfacial structure are discussed in detail. In addition techniques for assessing and improving adhesion are also reviewed.

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Bond Coat Development for Thermal Barrier Coatings

Cited by 12 publications

References 0 publications

Fatigue life of deposited repair welds on single-crystal high-temperature nickel alloy under cyclic oxidation

Fatigue life of deposited repair welds on single-crystal high-temperature nickel alloy under cyclic oxidation

The High Temperature Creep Properties of a Thermally Sprayed CoNiCrAlY Coating via Small Punch Creep Testing

Interfaces and Adhesion

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