Institute of Fundamental Technological Research
Polish Academy of Sciences


Konrad Tobota

Recent publications
1.  Ivor M., Medved D., Chmielewski T., Tobota K., Pietrzak K., Chmielewski M., Halama M., Kottfer D., Dusza J., Microstructure characteristics, tribology and nano-hardness of HVOF sprayed NiCrRe coating, DEFECT AND DIFFUSION FORUM, ISSN: 1662-9507, DOI: 10.4028/, Vol.405, pp.435-439, 2020

The high-velocity oxy-fuel technique (HVOF) was used to produce dense NiCrRe coating on boiler steel substrate with a minimal amount of oxide impurities and low porosity. Microstructure analysis, tribology and nano-hardness measurement have been realized with the aim to characterize the systems. The microstructure was studied using scanning electron microscopy and Energy-dispersive X-ray spectroscopy. Tribological characteristics have been studied under the dry sliding condition at applied loads of 5, 10 and 20 N using the ball-on-flat technique with SiC ball at room temperature. Nano-hardness was investigated in continuous stiffness measurement (CSM) mode, the indentation depth limit was 1500 nm. Microstructure analyses proved that the HVOF sprayed layer, with a thickness approximately 870 µm, contains a relatively low volume fraction of porosity with a chemical composition based on Nickel, Chromium, with white areas of Rhenium. The wear rate of the coating is significantly lower than the wear rate of 16Mo3 steel. The average values of indentation modulus and hardness were EIT = 237.6 GPa and HIT = 6.3 GPa, respectively.

HVOF, mechanical properties of NiCrRe, NiCrRe coating

Ivor M. - other affiliation
Medved D. - other affiliation
Chmielewski T. - Warsaw University of Technology (PL)
Tobota K. - other affiliation
Pietrzak K. - other affiliation
Chmielewski M. - Institute of Electronic Materials Technology (PL)
Halama M. - other affiliation
Kottfer D. - other affiliation
Dusza J. - Institute of Materials Research, Slovak Academy of Sciences (SK)

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