Cohesion in plasma-sprayed coatings — a comparison between evaluation methods

Erickson, Lynn; Westergård, Richard; Wiklund, Urban; Axén, N.; Hawthorne, H.M.; Hogmark, Sture

doi:10.1016/s0043-1648(97)00216-0

Cited by 70 publications

(24 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measured porosity of plasma-sprayed coatings is almost in agreement with the findings of Chen and Hutchings, 9 Erickson et al, 10 Hidalgo Fig. 12.…”

Section: Discussionsupporting

confidence: 89%

“…12. Oxide-scale morphology and elemental composition variation across the cross-section of NiCrAlY coating exposed to air at 900 • C for 50 cycles having substrates steels (a) GrA1, 370 X (b) T11, 110 X and (c) T22, 110 X. et al 11,12 and Belzunce et al 13 The identical structures as observed for as-sprayed coatings, having voids and oxide inclusions have also been reported by Vuoristo et al, 14 Hsu and Wu, 15 Westergard et al 16 Erickson et al 10 The resistance to oxidation in air is slightly better for T-11 and T-22 type steels than GrA1 on which the oxide scale is thick, porous and non-protective. However, the three types of substrate steels follow a parabolic-oxidation rate.…”

Section: Discussionsupporting

confidence: 56%

See 1 more Smart Citation

High-Temperature Oxidation Behavior of NiCrA1Y Bond Coats and Stellite-6 Plasma-Sprayed Coatings

Sidhu

Prakash

2005

Oxid Met

View full text Add to dashboard Cite

a shrouded plasma-spray process. The NiCrA1Y alloy powder was also sprayed as a bond coat before applying a Stellite-6 coating. The cyclic-oxidation behavior of the NiCrA1Y bond coats and Stellite-6 coating were evaluated at 900 • C. Visual observations and gravimetric data were measured at the end of each cycle. Finally, the scale was analyzed using X-ray Diffraction, Scanning-Electron Microscope, Energy-Dispersive X-Ray Studies and Electron-Probe Micro-Analyzer techniques. The coatings were found to be effective in increasing resistance to oxidation at the test temperature of 900 • C. The protection is higher in the case of the Stellite-6 coating. The protection is lesser for both coating types when T22 steel was the substrate and higher in the case of GrA1 steel. The deleterious behavior of Mo present in the T22 steel is perhaps responsible for conferring lesser protection.

show abstract

“…The measured porosity of plasma-sprayed coatings is almost in agreement with the findings of Chen and Hutchings, 9 Erickson et al, 10 Hidalgo Fig. 12.…”

Section: Discussionsupporting

confidence: 89%

Section: Discussionsupporting

confidence: 56%

High-Temperature Oxidation Behavior of NiCrA1Y Bond Coats and Stellite-6 Plasma-Sprayed Coatings

Sidhu

Prakash

2005

Oxid Met

View full text Add to dashboard Cite

show abstract

“…Sometimes, a qualitative approach is taken, particle/particle interfaces are examined by light optical microscopy or scanning electron microscopy [4]. One may also use the depth obtained in a scratch tests as an indirect measure of cohesion [5]. However, when quantitative data is sought, coatings must be deposited onto specialized test geometries [6] that require careful machining and a substantial quantity of sprayed material.…”

Section: Introductionmentioning

confidence: 99%

Modified ball bond shear test for determination of adhesion strength of cold spray splats

Chromik

Goldbaum

Shockley

et al. 2010

Surface and Coatings Technology

View full text Add to dashboard Cite

A modified ball bond shear test was developed to measure the adhesion of cold sprayed splats to both bulk substrates and cold sprayed coatings. The technique was applied to the deposition of Ti feedstock powder (spherical morphology, 29 m average dia.) onto a commercially pure bulk Ti plate and onto Ti coatings prepared with the same feedstock powder as the splats. Both an adhesion strength and adhesion energy were measured, with trends in adhesion examined as a function of in-air particle velocities between 580 and 825 m/s.Comparisons between cold spray splat on bulk materials versus coatings were conducted for two deposition conditions (694 and 825 m/s). Generally, the adhesion for splats deposited at the higher deposition condition were insensitive to the substrate material, while splats deposited at the lower deposition condition adhered better to the bulk material than to the coatings.3

show abstract

“…This mechanism involves intersplat crack propagation until splats are not longer attached and easily removed. Even if spray conditions are acceptable, intersplat cohesion is one of the weakest points of most of the thermal spray coatings [23,24], caused by the discontinuous solidification process inherent in plasma spraying. Debris produced by this wear mechanism has high dimensions because it comes from the detachment of single splats, though in other cases it could be generated by the elimination of bits of coating containing several splats.…”

Section: Friction Resistance and Wear Mechanismsmentioning

confidence: 99%

Tribological Behavior of Bronze Composite Coatings Obtained by Plasma Thermal Spraying

et al. 2011

View full text Add to dashboard Cite

Bronze aluminum composite coatings containing different amounts of alumina were fabricated by plasma spray process and their tribological properties were investigated using ball-on-disk (BOD) and rubber wheel (RW) tests at room temperature. Main wear mechanisms in pure bronze coatings during the ball-on-disk friction test were abrasion and intersplat delamination. The addition of alumina in bronze coatings clearly enhances their wear resistance. To explain this behavior, this article proposes an additional wear mechanism in the composite coatings that involves the rupture of the alumina lamellae located just below the wear track leading to a uniform distribution of fine alumina particles enveloped by the bronze matrix, which increase the surface hardness and hinder the wear. The deposition of debris on the wear track of composite coatings provokes an enhancement of the wear resistance as well. Bronze coatings show a low and stable friction coefficient of around l = 0.3. Nevertheless, coatings with reinforcing particles of alumina show an abrupt transition in the friction coefficient from values around l = 0.4-0.8, related to the modification of the surface contacts on the wear track due to the formation of a compacted debris layer deposited during the tribological test.

show abstract

Cohesion in plasma-sprayed coatings — a comparison between evaluation methods

Cited by 70 publications

References 10 publications

High-Temperature Oxidation Behavior of NiCrA1Y Bond Coats and Stellite-6 Plasma-Sprayed Coatings

High-Temperature Oxidation Behavior of NiCrA1Y Bond Coats and Stellite-6 Plasma-Sprayed Coatings

Modified ball bond shear test for determination of adhesion strength of cold spray splats

Tribological Behavior of Bronze Composite Coatings Obtained by Plasma Thermal Spraying

Contact Info

Product

Resources

About