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Influence of spray distance on mechanical and tribological properties of HVOF sprayed WC-Co-Cr coatings

Monika Górnik

Monika Górnik

Department of Metal Forming, Welding and Metrology, Faculty of Mechanical Engineering, Wroclaw University of Science and TechnologyWroclaw, Poland
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Górnik, Monika
, 
Ewa Jonda

Ewa Jonda

Department of Engineering Materials and Biomaterials, Silesian University of TechnologyGliwice, Poland
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Jonda, Ewa
, 
Leszek Łatka

Leszek Łatka

Department of Metal Forming, Welding and Metrology, Faculty of Mechanical Engineering, Wroclaw University of Science and TechnologyWroclaw, Poland
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Łatka, Leszek
, 
Monika Nowakowska

Monika Nowakowska

Department of Metal Forming, Welding and Metrology, Faculty of Mechanical Engineering, Wroclaw University of Science and TechnologyWroclaw, Poland
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Nowakowska, Monika
 und 
Marcin Godzierz

Marcin Godzierz

Centre of Polymer and Carbon Materials Polish Academy of SciencesZabrze, Poland
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Godzierz, Marcin
  
21. Apr. 2022
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Online veröffentlicht: 21. Apr. 2022
Seitenbereich: 545 - 554
Eingereicht: 02. Feb. 2022
Akzeptiert: 01. März 2022
DOI: https://doi.org/10.2478/msp-2021-0047
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© 2021 Monika Górnik et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Morphology of initial feedstock power (SEM-SE) with random measurements of particle size. SEM, scanning electron microscope
Morphology of initial feedstock power (SEM-SE) with random measurements of particle size. SEM, scanning electron microscope

Fig. 2

Schematic representation of the HVOF method and its key process parameter, inspired by Pawłowski [3] and Jonda and Łatka [33]. HVOF, high-velocity oxy-fuel spraying
Schematic representation of the HVOF method and its key process parameter, inspired by Pawłowski [3] and Jonda and Łatka [33]. HVOF, high-velocity oxy-fuel spraying

Fig. 3

The topography of the A1 sample surface
The topography of the A1 sample surface

Fig. 4

SEM images of coatings’ cross sections: (A, B) sample A1; (C, D) sample A2; (E, F) sample A3; (A, C, E) – mag. 2,000×; (B, D, F) – mag. 5,000×. SEM, scanning electron microscope
SEM images of coatings’ cross sections: (A, B) sample A1; (C, D) sample A2; (E, F) sample A3; (A, C, E) – mag. 2,000×; (B, D, F) – mag. 5,000×. SEM, scanning electron microscope

Fig. 5

XRD patterns of all WC-Co-Cr coatings manufactured by the HVOF method. XRD, X-ray diffraction; HVOF, high-velocity oxy-fuel spraying
XRD patterns of all WC-Co-Cr coatings manufactured by the HVOF method. XRD, X-ray diffraction; HVOF, high-velocity oxy-fuel spraying

Fig. 6

SEM images showing the wear track of deposited coatings: (A) A1, (B) A2, (C) A3. SEM, scanning electron microscope
SEM images showing the wear track of deposited coatings: (A) A1, (B) A2, (C) A3. SEM, scanning electron microscope

Sliding wear results: wear factor and friction coefficient (CoF)

A1 A2 A3
K, 10−9 mm3/(N · m) 77 ± 11 73 ± 9 81 ± 14
CoF, - 0.41 ± 0.07 0.40 ± 0.09 0.40 ± 0.07

Mean values of bond strength and type of fracture

A1 A2 A3
Bond strength, MPa 65 ± 3 61 ± 4 55 ± 3
Fracture type A/C A/C A/C

Values of spray distance and sample code

Sample code A1 A2 A3
Spray distance, mm 240 280 320

Values of elastic modulus and hardness from instrumental indentation test

A1 A2 A3
HIT, GPa 14.82 ± 1.25 14.67 ± 1.55 14.24 ± 1.35
EIT, GPa 339 342 336
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