Generation mechanisms of residual stresses in plasma-sprayed coatings

Katayama, Seiji; Fukushima, Takeshi; Kitahara, Shigeru

doi:10.1016/0042-207x(90)93938-f

Cited by 33 publications

(9 citation statements)

References 4 publications

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“…The basic principle and method of measurement can be seen in the references [6,7]. In this technique, a substrate was fixed onto a pair of knife edges by the contraction force provided by two springs attached to the ends of the substrate.…”

Section: Deposition Of Coatings and Residual Stress Evaluationmentioning

confidence: 99%

Effects of residual stress on the mechanical properties of plasma-sprayed thermal barrier coatings

Zhang

Watanabe

Katayama

2013

Engineering Fracture Mechanics

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Section: Deposition Of Coatings and Residual Stress Evaluationmentioning

confidence: 99%

Effects of residual stress on the mechanical properties of plasma-sprayed thermal barrier coatings

Zhang

Watanabe

Katayama

2013

Engineering Fracture Mechanics

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“…The substrate-curvature method based on Stoney formula has been widely used in various applications (e.g., Carlotti et al, 1997;Lacquaniti et al, 1997;Krulevitch et al, 1996;Hunsche et al, 2001;Oka et al, 2003;Menzel et al, 2005). Kuroda et al (1988Kuroda et al ( , 1990 have also utilized the formula for TS coatings. The simple form of Stoney formula makes determinations of material properties straightforward.…”

Section: Introductionmentioning

confidence: 99%

Determination of nonlinear properties of thermal sprayed ceramic coatings via inverse analysis

Nakamura

Liu

2007

International Journal of Solids and Structures

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A robust procedure to estimate nonlinear mechanical properties of thermally sprayed (TS) ceramic coatings is introduced. Such a method is valuable particularly for TS coatings since each may possess unique properties depending upon its processing condition. Traditionally, their responses have been assumed as linear elastic (isotropic or anisotropic) except in very high temperature environments where softening may occur. However, recent inspections revealed their properties to be more accurately characterized as nonlinear elastic. It appears their distinctive morphology consisting of cracks and interfaces are responsible for such a response. In this work, a versatile procedure to identify nonlinear properties of thermally sprayed coatings is developed. First, a suitable stress-strain model is proposed and then a nonlinear bi-material beam solution is derived. Afterward, an inverse analysis technique is utilized to process the measured curvature-temperature to extract the unknown parameters. Prior to implementing in actual specimens, a detailed simulation study is performed to verify the method's accuracy as well as robustness. This computational analysis closely replicates deposition processes of TS coatings. With the successful verification, actual curvature measurement of TS yttria-stabilized zirconia (YSZ) coating is used to determine the nonlinear properties. The estimated results clearly reveal a significant nonlinearity of the TS coating. The main advantage of this procedure is that it requires essentially no specimen preparation and allows continuous measurements after TS deposition. Furthermore, the data interpretation does not require complex computational models and calculations. This streamlined process makes the present method attractive when evaluations of many specimens are required. The present procedure can be also extended to identify nonlinear properties of other coatings/films on substrates.

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“…The degree of relaxation or the local stress values are not accessible to the experimental measurement, but the effects of the quenching stresses were observed by monitoring the curvature induced in a relatively thin substrate Á/deposit pair [18,19,22 Á/24]. The results show that the resulting residual stresses are of a level of 10Á/100 MPa and are insensitive to the substrate material and the spraying conditions, as long as the coating thickness exceeds 10 mm [18], but they are affected by the substrate temperature especially when metallic materials are sprayed [21,25].…”

Section: Introductionmentioning

confidence: 99%

“…The second kind of stresses arise during cooling particularly after spraying; in some of these cases the experiments [18,22] have shown a decrease in the curvature of the specimen or even an inversion of its form. Because they occur during the cooling to room temperature, these stresses were named cooling stresses [19].…”

Section: Introductionmentioning

confidence: 99%

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Study by X-ray diffraction and mechanical analysis of the residual stress generation during thermal spraying

Pina

Dias

Lebrun

2003

Materials Science and Engineering: A

105

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Thermally sprayed coatings are formed by the deposition of molten or partially molten particles, propelled onto a substrate where they impact, spread and solidify rapidly. Residual stresses are expected within the sprayed deposit as a consequence of the release of thermal and kinetic energies. A wide range of materials and two spraying techniques are considered in this study, namely atmospheric plasma spraying (APS) and high-velocity oxygen fuel. Stresses were determined by the X-ray diffraction (XRD) method. The results were compared with those calculated by mechanical analysis of stress relief in coatings detached from the substrate. Comparison of the results for adherent and free-standing coatings shows that the residual stress state can be resolved in terms of the components suggested by models that propose two stages of stress generation: quenching stresses and secondarycooling stresses. The in-depth distribution of residual stresses, through the coating thickness, is discussed in terms of the nature of the coating system. #

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Generation mechanisms of residual stresses in plasma-sprayed coatings

Cited by 33 publications

References 4 publications

Effects of residual stress on the mechanical properties of plasma-sprayed thermal barrier coatings

Effects of residual stress on the mechanical properties of plasma-sprayed thermal barrier coatings

Determination of nonlinear properties of thermal sprayed ceramic coatings via inverse analysis

Study by X-ray diffraction and mechanical analysis of the residual stress generation during thermal spraying

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