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| Abstract No.: |
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| Title: |
Properties of HVOF sprayed WC-Co coatings after ESD process
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| Authors: |
Wojciech Zórawski / Kielce University of Technology, Poland
Norbert Radek/ Kielce University of Technology, Poland
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| Abstract: |
HVOF sprayed coatings are widely used to improve the service life of machine components. Influence of spraying parameters and different kinds of materials on coatings properties have been investigated in many works. Our investigations concern properties of HVOF sprayed two tungsten carbide coatings after applying electrospark deposition process (ESD). Microstructure of sprayed coatings after finishing were changed by applying tungsten carbide electrode. Changes of microstructure and properties of the sprayed and after ESD process coatings was analysed with a scanning microscope JOEL JSM-5400, the element distribution with a microprobe ISIS 300 Oxford Instruments and phase composition by diffractometer D8 Advance (BRUKER). The roughness of coatings was measured with Talysurf-4, whereas Matuzawa MMT-X3A was used to study changes their hardness. Ball on disc tester and dry abrasive rubber wheel tester were applied to estimate coefficient of friction and wear resistance of sprayed coatings before and after EDM process.
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