Microstructure Characteristics, Tribology and Nano-Hardness of HVOF Sprayed NiCrRe Coating

Abstract:

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 E_IT = 237.6 GPa and H_IT = 6.3 GPa, respectively.

• Periodical: Defect and Diffusion Forum (Volume 405)
• Pages: 435-439
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.405.435
• Online since: November 2020
• Authors: Michal Ivor*, Dávid Medved, Tomasz Chmielewski, Konrad Tobota, Katarzyna Pietrzak, Marcin Chmielewski, Maroš Halama, Daniel Kottfer, Jan Dusza
• Keywords: HVOF, Mechanical Properties of NiCrRe, NiCrRe Coating

References

[1] M. Schütze, M. Malessa, V. Rohr, T. Weber, Development of coatings for protection in specific high temperature environments, Surf. Coat. Technol. 201 (2006) 3872-3879.

DOI: 10.1016/j.surfcoat.2006.07.262

[2] M.A. Uusitalo, P.M.J. Vuoristo, T.A. Mantyla, High temperature corrosion of coatings and boiler steels in reducing chlorine-containing atmosphere, Surf. Coat. Technol. 161 (2002) 275-285.

DOI: 10.1016/s0257-8972(02)00472-3

[3] M.F. Morks, C.C. Berndt, Corrosion and oxidation properties of NiCr coatings sprayed in presence of gas shroud system, Appl. Surf. Sci. 256 (2010) 4322-4327.

DOI: 10.1016/j.apsusc.2010.02.024

[4] T. Chmielewski, D. Golanski, New method of in-situ fabrication of protective coatings based on Fe–Al intermetallic compounds, J. Eng. Manuf. 225 (2011) 611-616.

[5] J. Liang, W. Gao, Z. Li, Y. He, Hot corrosion resistance of electro spark-deposited Al and Ni–Cr coatings containing dispersed Y2O3 particles, Mater. Lett. 58 (2004) 3280-3284.

DOI: 10.1016/j.matlet.2004.06.018

[6] M.A. Uusitalo, P.M.J. Vuoristo, T.A. Mantyla, High temperature corrosion of coatings and boiler steels in reducingchlorine-containing atmosphere Surface and Coatings Technology 161 (2002) 275-285.

DOI: 10.1016/s0257-8972(02)00472-3

[7] V. Kindrachuk, N. Wanderka, J. Banhart, D.Mukherij, D. Del Genovese, J. Rosler, Effect of rhenium addition on the microstructure of the superalloy Inconel 706, Acta Materialia 56, 7 (2008) 1609-1618,.

DOI: 10.1016/j.actamat.2007.12.010

[8] Information on https://www.oerlikon.com/ecomaXL/files/metco/oerlikon_DSMTS-0109.2_Ni 20Cr_Powders.pdf&download=1.

[9] M. Niedzielska, T. Chmielewski, Warunki natryskiwania HVOF powłoki Cr3C2-NiCr na stal 316L, Welding Technology Review 89, 3 (2017) 46-50.

DOI: 10.26628/ps.v89i3.748

[10] K. Tobota, T. Chmielewski, M. Chmielewski, Microstructure and selected properties of Ni-Cr-Re coatings deposited by means of HVOF thermal spraying, Welding Technology Review 91, 1 (2019), [Accessed online: 2019-06-18] https://www.researchgate.net/publication/331484403 Microstructure_and_selected_properties_of_Ni-Cr-Re_coatings_deposited_by_means_of_ HVOF thermal_spraying.

DOI: 10.26628/wtr.v91i1.1000