The interrelationship between internal stress, processing parameters and microstructure of physically vapour deposited and thermally sprayed coatings

Rickerby, D.S.; Eckold, Geoff; Scott, K.T.; Buckley-Golder, I.M.

doi:10.1016/0040-6090(87)90358-0

Cited by 70 publications

(16 citation statements)

References 9 publications

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“…The growth of this oxide [3] and the sintering [5] of the YSZ layer during thermal ageing are the main sources of residual stresses in the TGO and YSZ and lead to the eventual failure of the coating system. The extensive use of the YSZ layer as a TBC has given rise to much research focused on how the degradation of this coating system depends upon different application methods [6], the microstructure of the coatings [7] and [8], and the residual stress distributions in the YSZ and TGO layers [9], [10] and [11]. Among the non-destructive approaches to material investigation, Raman and photostimulated luminescence piezeo-spectroscopy (PLPS) are the techniques favoured for the measurement of stresses in YSZ and TGO respectively.…”

Section: Introductionmentioning

confidence: 99%

The role of beam dispersion in Raman and photo-stimulated luminescence piezo-spectroscopy of yttria-stabilized zirconia in multi-layered coatings

et al. 2013

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Laser beam dispersion affects the resolution of Raman and photo-stimulated luminescence piezo-spectroscopy measurements of transparent materials. In this paper, we investigate the lateral spreading of the laser beam and the axial sampling depth of Raman spectroscopy measurements within thermal sprayed yttria-stabilized zirconia (YSZ) thin coatings. The lateral diameters of the laser beams (λ = 632.8 nm and 514 nm) reach approximately ∼160 µm after travelling through a thickness of 200 µm of air plasma sprayed (APS) YSZ and ∼80 µm after travelling through 120 µm of electron beam physical vapour deposited YSZ. The Raman spectroscopy sampling depth was found to be between 30 and 40 µm in APS YSZ. The beam dispersions within these two coatings were simulated using the ray-tracing software ZEMAX to understand the observed scattering patterns. The results are discussed with respect to the application of these two spectroscopic techniques in multi-layered thermal barrier coating systems.

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Section: Introductionmentioning

confidence: 99%

The role of beam dispersion in Raman and photo-stimulated luminescence piezo-spectroscopy of yttria-stabilized zirconia in multi-layered coatings

et al. 2013

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“…This suggests a compressive stress at the inner side. Mechanisms explaining such a behaviour can be found in [40].…”

Section: Characterisationmentioning

confidence: 99%

Thermal fatigue resistance of plasma sprayed yttria-stabilised zirconia onto borided hot work tool steel, bonded with a NiCrAlY coating: Experiments and modelling

D’Ans¹,

Dille²,

Debouverie³

2011

Surface and Coatings Technology

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Repeated fast surface temperature transients can damage the materials and/or their surface treatments by thermal fatigue. This happens in aluminium diecasting devices. One conducted thermal fatigue tests with samples of hot work tool steel, respectively untreated, simply borided and protected by a multi-layer. In the last case, top coat is yttria stabilised zirconia (YSZ), followed by a nickel superalloy and then a borided layer (undercoat). The zirconia coating was applied with plasma spray. The multi-layer showed poor resistance during the thermal fatigue tests. Better understanding these tests and the resulting thermal fatigue observed on the treated materials was achieved by a lifetime model based on Coffin-Manson equations.

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“…Another output parameter is the distribution of the aspect ratio of the pores: its importance relies on its strong influence on the mechanical and thermal effective properties of the coating (Rickerby et al, 1987 andMcPherson, 1989). The typical feature of these types of distributions are the abundance of thin, elongated pores (like cracks) with an aspect ratio less than 0.3 in the simulated coating.…”

Section: Selection Of the Objective Functionmentioning

confidence: 99%

Engineering plasma spray films by knowledge based simulation

Foy¹,

Marchese

Jacucci

1999

IFIP Advances in Information and Communication Technology

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The FABERCOAT Decision Support System (DSS) is a design tool for the production of plasma-sprayed coatings developed in a CEC project among European universities, laboratories and manufacturing industries. The FABERCOAT system utilises a genetic algorithm to find a set of spray settings which can be used to achieve one particular set of desired final (and measurable) properties of the coating. At present, these desired outcomes are based on specific industrial requirements based on total porosity demands and most frequent porosity aspect ratio. The FABERCOAT system includes a model for the plasma spray manufacturing process developed and validated within the CEC project. The model has been used to "harvest" the information gained in the extensive production and characterisation programme of the CEC project and has provided an innovative way of feeding back this information to the end-users.

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The interrelationship between internal stress, processing parameters and microstructure of physically vapour deposited and thermally sprayed coatings

Cited by 70 publications

References 9 publications

The role of beam dispersion in Raman and photo-stimulated luminescence piezo-spectroscopy of yttria-stabilized zirconia in multi-layered coatings

The role of beam dispersion in Raman and photo-stimulated luminescence piezo-spectroscopy of yttria-stabilized zirconia in multi-layered coatings

Thermal fatigue resistance of plasma sprayed yttria-stabilised zirconia onto borided hot work tool steel, bonded with a NiCrAlY coating: Experiments and modelling

Engineering plasma spray films by knowledge based simulation

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