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Fig. 1
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
Fig. 3
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
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
Fig. 6
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