Experimental study of high velocity oxy-fuel sprayed WC-17Co coatings applied on complex geometries. Part B: Influence of kinematic spray parameters on microstructure, phase composition and decarburization of the coatings

Katranidis, Vasileios; Gu, Sai; Reina, Tomás Ramírez; Alpay, E.; Allcock, Bryan; Kamnis, Spyros

doi:10.1016/j.surfcoat.2017.09.027

Cited by 24 publications

(13 citation statements)

References 44 publications

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“…As discussed in previous work (Ref 17,18), the significant role of spray distance and spray angle in determining the particle impingement conditions does not allow for the isolated study of either one without considering the interplay between them. The same is not true for the effect of gun traverse speed since it does not influence the particle impingement conditions, rather it affects the coating via post-impingement mechanisms (Ref 18).…”

Section: Interpolation Of the Experimental Resultsmentioning

confidence: 98%

“…12g and h). Detailed analysis and discussion of these coating properties take place in the previous (and future) work (Ref 17,18). The interpolation method for the surfaces in Fig.…”

Section: Interpolation Of the Experimental Resultsmentioning

confidence: 99%

“…Although the method of the kinematic calculator can be generalized to model any coating material or thermal spray method, in this work, the application of WC-17Co with HVOF is examined due to the availability of experimental results from previous work (Ref 17,18). It was shown that there is significant interplay between the spray distance and spray angle in determining the coating properties since both determine the impingement conditions of the particles.…”

Section: Outline Of the Kinematic Calculatormentioning

confidence: 99%

“…The limits of the prediction space are dictated by the extreme values of the input experimental results. In the case study presented here, the experimental results from previous work (Ref 17,18) were used as input for constructing the prediction space for the coating thickness, WC vol.% and microhardness. Additionally, the sliding wear resistance was included in the study herein, though detailed analysis and discussion of the tribology of the coatings will be presented in a future publication.…”

Section: Outline Of the Kinematic Calculatormentioning

confidence: 99%

“…This work builds on the experimental results of previous studies that discuss the effects of the spray kinematic parameters on various HVOF-sprayed WC-17Co coating properties (Ref 17,18) and presents an attempt to generalize the produced insights to valuable predictions on spraying arbitrarily complex geometries, internally or externally.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Coating Properties of Thermally Sprayed WC–Co on Complex Geometries

Katranidis

Kamnis

2018

J Therm Spray Tech

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This work outlines the development of an analytical software tool that enables the prediction of various coating properties on any given sprayable geometry. The prediction is achieved by analyzing the input computeraided design geometry and by correlating the resulting kinematic conditions with experimental measurements. The results of the developed tool have been validated experimentally using HVOF-sprayed WC-17Co coatings. Specifically, coating thickness, microhardness, WC vol.% and specific sliding wear rate are examined and their values are predicted for the case of the external spray of a rotorlike model.

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Section: Interpolation Of the Experimental Resultsmentioning

confidence: 98%

“…12g and h). Detailed analysis and discussion of these coating properties take place in the previous (and future) work (Ref 17,18). The interpolation method for the surfaces in Fig.…”

Section: Interpolation Of the Experimental Resultsmentioning

confidence: 99%

Section: Outline Of the Kinematic Calculatormentioning

confidence: 99%

Section: Outline Of the Kinematic Calculatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prediction of Coating Properties of Thermally Sprayed WC–Co on Complex Geometries

Katranidis

Kamnis

2018

J Therm Spray Tech

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FIB-SEM Sectioning Study of Decarburization Products in the Microstructure of HVOF-Sprayed WC-Co Coatings

Katranidis

Cox

et al. 2018

J Therm Spray Tech

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The thermal dissolution and decarburization of WC-based powders that occur in various spray processes are a widely studied phenomenon, and mechanisms that describe its development have been proposed. However, the exact formation mechanism of decarburization products such as metallic W is not yet established. A WC-17Co coating is sprayed intentionally at an exceedingly long spray distance to exaggerate the decarburization effects. Progressive xenon plasma ion milling of the examined surface has revealed microstructural features that would have been smeared away by conventional polishing. Serial sectioning provided insights on the three-dimensional structure of the decarburization products. Metallic W has been found to form a shell around small splats that did not deform significantly upon impact, suggesting that its crystallization occurs during the in-flight stage of the particles. W 2 C crystals are more prominent on WC faces that are in close proximity with splat boundaries indicating an accelerated decarburization in such sites. Porosity can be clearly categorized in imperfect intersplat contact and oxidation-generated gases via its shape.

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Effects and Interplays of Spray Angle and Stand-off Distance on the Sliding Wear Behavior of HVOF WC-17Co Coatings

et al. 2019

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The state of particle impact (velocity and temperature) significantly affects the coating's microstructural, mechanical properties and wear performance. The spray stand-off distance and spray angle dictate particle velocity components and temperature at impact. This work aims in advancing the understanding of their effect and interplay in regard to the sliding wear performance as well as the mechanisms of wear themselves of HVOF-sprayed WC-17Co coatings. Dry sliding wear resistance was evaluated by a pin-on-disk test, and significant interplay between the spray parameters was observed. A large number of experiments in a full-factorial manner provided insights into the progressive tribofilm build-up and wear damage modes and allowed for proposing mechanisms regarding their occurrence. Small deviations from the normal spray angle at long stand-off distances proved to be beneficial for the wear performance of the coatings. The highest friction coefficient and most aggressive wear damage were observed in coatings with a rich coverage of the wear track with a tribofilm. The phase composition of the coatings proved to be the principal contributor in the wear performance.

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Experimental study of high velocity oxy-fuel sprayed WC-17Co coatings applied on complex geometries. Part B: Influence of kinematic spray parameters on microstructure, phase composition and decarburization of the coatings

Cited by 24 publications

References 44 publications

Prediction of Coating Properties of Thermally Sprayed WC–Co on Complex Geometries

Prediction of Coating Properties of Thermally Sprayed WC–Co on Complex Geometries

FIB-SEM Sectioning Study of Decarburization Products in the Microstructure of HVOF-Sprayed WC-Co Coatings

Effects and Interplays of Spray Angle and Stand-off Distance on the Sliding Wear Behavior of HVOF WC-17Co Coatings

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