Temperature dependence of dynamic Young's modulus and internal friction in LPPS NiCrAlY

Cook, L. S.; Wolfenden, A; Brindley, William J.

doi:10.1007/bf01151103

Cited by 26 publications

(6 citation statements)

References 3 publications

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“…The differences in the magnitudes of Young's moduli determined for batches V2-02-27E and V2-03-528 varied between 2.5 and 7.5% in the temperature range 300 to 1150 K primarily reflected in the magnitudes of E 0 rather than (∂E D /∂T). The values reported by Cook et al [19,33] are in excellent agreement with the magnitudes of E D determined for batch V2-02-27E. The static moduli values are lower than the dynamic moduli and exhibit more scatter especially at the higher temperatures.…”

Section: Cu-cr Coatingssupporting

confidence: 79%

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Young's moduli of cold and vacuum plasma sprayed metallic coatings

Raj

Pawlik

Loewenthal³

2009

Materials Science and Engineering: A

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Section: Cu-cr Coatingssupporting

confidence: 79%

“…Figure 3 compares the magnitudes of dynamic and static Young's moduli for the two batches of NiCrAlY coatings. The data of Cook et al [19,33] for an alloy of similar composition are also shown in the figure for comparison. The data are well represented by eq.…”

Section: Cu-cr Coatingsmentioning

confidence: 87%

Young's moduli of cold and vacuum plasma sprayed metallic coatings

Raj

Pawlik

Loewenthal³

2009

Materials Science and Engineering: A

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“…23; the authors considered the phenomenon a consequence of the phase transformation in the ternary NiCrA1 alloy.…”

Section: Resultsmentioning

confidence: 99%

Measurement of coatings' elastic properties by mechanical methods: Part 2. Application to thermal barrier coatings

Beghini

Benamati

Bertini

et al. 2001

Experimental Mechanics

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ABSTRACT--Elastic properties of a thermal barrier ceramic coating composed of an NiCoCrAIY bond coat and a ZrO2(Y203) top coat were measured by a four-point bending rig in the temperature range 20~176 Different types of specimens (i.e., with bond coat only or with bond coat and top coat, on one side or on both sides) were employed. Test procedures were based on the theory discussed in Part 1 to enhance accuracy and to estimate confidence intervals. In particular, the method employed at high temperature was calibrated at room temperature by comparing the results with those obtained by methods with low sensitivity to layer thicknesses. For the bond coat, Young's modulus was found to be temperature independent up to about 500~ a decreasing trend was observed above this temperature. For the top coat, a slightly decreasing Young's modulus was observed over the whole temperature range examined. A possible explanation is given on the basis of phase transformation and the microstructure of the two layers. At room temperature, Poisson's ratio for the bond coat was found to be near 0.3, whereas a near zero value was measured for the top coat.KEY WORDS--Coatings, elastic modulus, Poisson's ratio, mechanical testing, temperature dependence Nomenclature B = specimen width H = total specimen thickness L = total specimen length S = specimen length subjected to constant bending a = spacing between the inner and outer loading pins in the four-point bending testEs, Ebc, Etc = Young's modulus of substrate, bond-coat and top-coat materials Vs, Vbe, Vtc = Poisson's ratio of substrate, bond-coat and top-coat materials hs, hbc, htc = thickness of the substrate, bond-coat and top-coat layers gs, gbc, gtc -----depth coordinate of the substrate, bond-coat and top-coat centroid, with reference to the geometric center of the specimen M. Beghini is a Professor,

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“…The plastic properties of the bond coat are vital in preventing the fracture in the brittle interface. The creep strength of the bond coat should be sufficiently high to avoid the negative effects of compressive stresses induced in the TGO [75]. An in-plane compressive stress is setup in the top coat when the cooling rate is very high, this compressive stress induces an out of the plane tensile stress which causes spallation of the top coat.…”

Section: Properties Of Thermal Barrier Coatingmentioning

confidence: 99%

Thermal Barrier Coatings—A State of the Art Review

et al. 2020

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Thermal barrier coatings (TBCs) have seen considerable advancement since the initial testing and development of thermal spray coating. Thermal barrier coatings are currently been utilized in various engineering areas which include internal combustion engines, gas turbine blades of jet engines, pyrochemical reprocessing units and many more. The development of new materials, deposition techniques is targeted at improving the life of the underlying substrate. Hence, the performance of the coating plays a vital role in improving the life of substrate. The scope for advancement in thermal barrier coatings is very high and continuous efforts are being made to produce improved and durable coatings. Thermal barrier coatings have the potential to address long term and short-term problems in gas turbine, internal combustion and power generation industry. The study of thermal barrier coating material, performance and life estimation is a critical factor that should be understood to introduce any advancement. The present review gives an overview of the thermal spraying techniques and current advancements in materials, mechanical properties, understanding the high temperature performance, residual stress in the coating, understanding the failure mechanisms and life prediction models for coatings.

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Temperature dependence of dynamic Young's modulus and internal friction in LPPS NiCrAlY

Cited by 26 publications

References 3 publications

Young's moduli of cold and vacuum plasma sprayed metallic coatings

Young's moduli of cold and vacuum plasma sprayed metallic coatings

Measurement of coatings' elastic properties by mechanical methods: Part 2. Application to thermal barrier coatings

Thermal Barrier Coatings—A State of the Art Review

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