Thermal shock of functionally graded thermal barrier coatings with similar thermal resistance

Kokini, Klod; DeJonge, Jeffery; Rangaraj, Sudarshan; Beardsley, B

doi:10.1016/s0257-8972(02)00031-2

Cited by 125 publications

(40 citation statements)

References 16 publications

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“…Typically, a FGM is made of a ceramic and a metal for the purpose of thermal protection against large temperature gradients. FGMs were initially designed for use in high-temperature environments [23][24][25], but now they are developed for applications that require high structural performance [12][13][14]19,20,[26][27][28][29][30]. Some of these studies were carried out on an analysis of FGM shells embedded in an elastic foundation or filled with fluid.…”

Section: Introductionmentioning

confidence: 99%

Effect of partial elastic foundation on free vibration of fluid-filled functionally graded cylindrical shells

Kim

2015

Acta Mech. Sin.

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The free vibration characteristics of fluid-filled functionally graded cylindrical shells buried partially in elastic foundations are investigated by an analytical method. The elastic foundation of partial axial and angular dimensions is represented by the Pasternak model. The motion of the shells is represented by the first-order shear deformation theory to account for rotary inertia and transverse shear strains. The functionally graded cylindrical shells are composed of stainless steel and silicon nitride. Material properties vary continuously through the thickness according to a power law distribution in terms of the volume fraction of the constituents. The governing equation is obtained using the Rayleigh-Ritz method and a variation approach. The fluid is described by the classical potential flow theory. Numerical examples are presented and compared with existing available results to validate the present method.

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Section: Introductionmentioning

confidence: 99%

Effect of partial elastic foundation on free vibration of fluid-filled functionally graded cylindrical shells

Kim

2015

Acta Mech. Sin.

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“…coating and loss of thermal protection to the substrate. [15] When the spallation area reaches about 5% of total coating area, the TBC sample is considered as failure. The number of thermal cycles recorded is an indication of thermal shock resistance.…”

Section: Thermal Shock Behaviour Of Tbcmentioning

confidence: 99%

The Effect of Samples Geometry and Thermal Cycling Test Type on the Thermal Shock Behaviour of Plasma Sprayed TBCs

Altuncu¹,

Karaalİ²,

Erdoğan³

et al. 2009

Plasma Processes & Polymers

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Thermal barrier coatings (TBCs) are effective in protecting gas turbine blades by insulating them from hot gas passing through. In addition, they provide prevention of thermal shock, oxidation resistance and improved engine efficiency. A major life‐limiting weakness of TBCs is their susceptibility to get damaged by thermally‐induced stresses. The thermal shock behaviour of TBC systems subjected to thermal shock loading and the influence of the cracks on the coating durability was investigated experimentally. In this study, TBCs (NiCrAlY + YSZ), which have different sample geometry were subjected to both of gas burner and furnace thermal cycle tests. Sample geometry and cycle test type effect on the correlation of thermal shock behaviour of TBC coatings were characterized by macroscopic and microstructural investigations.

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“…A gradual transition in properties through the coating thickness can be established [16,17] and will assist the reduction in residual stresses [18.19] associated with thermal expansion mismatch [20,21]. The external part of the specimens resistance to thermal shock cracking can be improved [22,23] as well as a superior bonding between compositions of material allowing for it to become more resistant to delamination [24,25]. It has been demonstrated that functionally graded heat resistant coatings also have better resistance to oxidization and a longer lifetime during test conditions than those formed without any type of functional grading [26].…”

Section: Fig1mentioning

confidence: 99%

Laser melting functionally graded composition of Waspaloy® and Zirconia powders

Mumtaz

Hopkinson

2007

J Mater Sci

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An approach for fabricating functionally graded specimens of supernickel alloy and ceramic compositions via Selective Laser Melting (SLM) is presented. The focus aimed at using the Functionally Graded Material (FGM) concept to gradually grade powdered compositions of Zirconia within a base material of Waspaloy ® . A high power Nd:YAG laser was used to process the material compositions to a high density with gradual but discrete changes between layered compositions. The graded specimens initially consisted of 100% Waspaloy ® with subsequent layers containing increased volume compositions of Zirconia (0-10%).Specimens were examined for porosity and microstructure. It was found that specimens contained an average porosity of 0.34% with a gradual change between layers without any major interface defects.

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Thermal shock of functionally graded thermal barrier coatings with similar thermal resistance

Cited by 125 publications

References 16 publications

Effect of partial elastic foundation on free vibration of fluid-filled functionally graded cylindrical shells

Effect of partial elastic foundation on free vibration of fluid-filled functionally graded cylindrical shells

The Effect of Samples Geometry and Thermal Cycling Test Type on the Thermal Shock Behaviour of Plasma Sprayed TBCs

Laser melting functionally graded composition of Waspaloy® and Zirconia powders

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