Calculation of residual thermal stress in plasma-sprayed coatings

Elsing, R.; Knotek, O.; Balting, U.

doi:10.1016/0257-8972(90)90093-r

Cited by 49 publications

(12 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5 for alumina are good examples of such results. They differ from the predictions of models based on the global heat transfer during the spraying process, which predict considerable gradients in the thickness of the deposits [15]. The residual stress state results only from the quenching stresses (Fig.…”

Section: Residual Stresses and Characteristics Of The Coating Systemmentioning

confidence: 57%

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

View full text Add to dashboard Cite

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. #

show abstract

Section: Residual Stresses and Characteristics Of The Coating Systemmentioning

confidence: 57%

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

View full text Add to dashboard Cite

show abstract

“…[10][11][12][13][14] However, if these authors found compressive stresses, the cracks observed on their samples could occur only with tensile stresses. Most of these studies were of ceramics other than hydroxyapatite.…”

Section: Introductionmentioning

confidence: 86%

Stress influence on interface in plasma‐sprayed hydroxyapatite coatings on titanium alloy

Millet

Girardin

Braham

et al. 2002

J. Biomed. Mater. Res.

View full text Add to dashboard Cite

During clinical use of hydroxyapatite-coated implants, mechanical stresses are added to pre-existing residual stresses. The magnitude of these stresses affects the coating's performance. In this work we studied, by neutron diffraction and conventional X-ray diffraction methods, the macrostresses induced by a plasma-spraying process in the coating and at the interface. Neutron diffraction is one of the most suitable techniques for studying the strain distribution in a bulk material. X-ray diffraction was used to determine residual stress in the hydroxyapatite coating. Using a neutron diffraction method at the nearest point to the interface, we saw no real difference between the stress observed on coated and that on non-coated samples. With the X-ray diffraction method, it appeared that the stress level was compressive on every sample. The major advantage of the neutron diffraction method is that measurements can be made on a thick coating in a nondestructive way. The disadvantage is the large-gauge volume that we had to use because of the relatively low intensity of the neutron beam. Polishing is necessary for measurements inside the material when using the X-ray method. This destructive method may alter the stress field of the deposit.

show abstract

“…Quenching stress and mismatch stress are two major contributions to the residual stress [4][5][6][7]. The so-called quenching stress is generated by rapid cooling of hot-sprayed molten splats striking the substrate whereas the mismatch stress sets up due to the mismatch of thermal contraction during the final cooling (cooling from the steady state deposition temperature to ambient temperature).…”

Section: Estimation Of Residual Stressmentioning

confidence: 99%

Determination of elastic modulus and residual stress of plasma-sprayed tungsten coating on steel substrate

You

Höschen

Lindig

2006

Journal of Nuclear Materials

View full text Add to dashboard Cite

Plasma-sprayed tungsten, which is a candidate material for the first wall armour, shows a porous, heterogeneous microstructure. Due to its characteristic morphology, the properties are significantly different from those of its dense bulk material. Measurements of the elastic modulus of this coating have not been reported in the literature. In this work YoungÕs modulus of highly porous plasma-sprayed tungsten coatings deposited on steel (F82H) substrates was measured. For the fabrication of the coating system the vacuum plasma-spray process was applied. Measurements were performed by means of three-point and four-point bending tests. The obtained modulus values ranged from 53 to 57 GPa. These values could be confirmed by the test result of a detached coating strip, which was 54 GPa. The applied methods produced consistent results regardless of testing configurations and specimen sizes. The errors were less than 1%. Residual stress of the coating was also estimated.

show abstract

Calculation of residual thermal stress in plasma-sprayed coatings

Cited by 49 publications

References 3 publications

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

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

Stress influence on interface in plasma‐sprayed hydroxyapatite coatings on titanium alloy

Determination of elastic modulus and residual stress of plasma-sprayed tungsten coating on steel substrate

Contact Info

Product

Resources

About