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Effect of burnishing on surface texture of Ni - Al plasma sprayed coatings

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The purpose of this study was the selection of roller- burnishing parameters of surface Ni-Al coatings obtained by "PN 120" plasma torch. Coatings with low surface roughness could be applied as layers increase the service life of torque pumps shaft used on vessels in the sea water systems. After turning, the average surface roughness of plasma sprayed Ni-5% Al coatings was Ra = 0.77 mi m. Their average hardness was equal to the 253 HV 2. It was comparable to the hardness of flame sprayed Ni-Al coatings after the burnishing. Before machining, plasma sprayed alloy coatings were characterized by hardness 206 HV 2. After pre-treatment, plasma sprayed Ni-Al coatings were burnishing. Burnishing parameters were as follows: Vn=28.26 m/min, Fn=1100N, fn=0,08m/rev. Burnishing reduces the surface roughness of coatings as compared to machining. The arithmetical mean deviation of the assessed profile of machined coatings was 0.78 mi m. After the plastic working, the Ra parameter was reduced to a value of 0.28 mi m. Total height of profile of machined coatings was only 2.63 mim. After burnishing, the value of Wt decreased by 0.16 mi m, to the value of 2.47 mi m. Studies burnished surface topography of coatings of Ni-5% Al overlaid by "PN 120" torch revealed the presence of defects stereometric structure. There is the folding. These folding are arranged in the direction of peripheral velocity vector. The observed high folding on the surface of alloy coatings sprayed by plasmatron were lower from the same geometric structure defects on the surface of coatings obtained by flame spraying methods. This follows from the fact that the plasma coating, after turning, characterized by higher hardness of the sprayed coating obtained by and "Roto-Teck 80" method. Thus, exhibit a lower propensity for plastic deformation. After plastic working of plasma coatings, decrease of parameters of the material ratio curve values were observed. For example, the reduced peak height of cut coatings were 1.38 mi m, after burnishing Rpk value fell to 0.23 mi m.
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  • Gdynia Maritime University, Department of Marine Maintenance Morska Street 81-87, 81-225 Gdynia, Poland tel.:+48 58 6901249, fax +48 58 6901399, starosta@am.gdynia.pl
Bibliografia
  • [1] Kung-Hsu, H., Ming-Chang, J., Ming-Der, G., A study on the wear resistance characteristics of pulse electroforming Ni–P alloy coatings as plated, Wear, Vol. 265, pp. 833-844, 2007.
  • [2] Bolelli, G., Cannillo, V., Lusvarghi, L., Ricco, S. Mechanical and tribological properties of electrolytic hard chrome and HVOF-sprayed coatings, Surface and Coatings Technology, Vol. 200, pp. 2995 – 3009, 2006.
  • [3] DuraSpindle, Increasing performance, Information materials MAN B&W, 2005.
  • [4] Franzen, V., Trompeter, M. Brosius, A., Tekkaya, A. E., Finishing of thermally sprayed tool coatings for sheet metal forming operations by roller burnishing, Int J Mater Form, Vol. 3, pp. 147-150, 2010.
  • [5] Franzen, V., Witulski, J., Brosius, A., Trompeter, M., Tekkaya, A. E., Thermally sprayed coatings as effective tool surfaces in sheet metal forming applications, Journal of Thermal Spray Technology, Vol. 20, pp. 939 -947, 2011.
  • [6] Dyl, T., Starosta, R., Skoblik, R., The effect of the unit pressure on the NiAl and Ni3Al intermetallic coatings selection parameters after plastic working, Solid State Phenomena, Vol. 165, pp.19-24, 2010.
  • [7] Szczepanik, S., Przeróbka plastyczna materiałów spiekanych z proszków i kompozytów, Uczelniane Wydawnictwa Naukowo-Dydaktyczne Akademii Górniczo Hutniczej, Kraków 2003.
  • [8] Szczepanik, S., Polowski, W., Czechowski, K., Wojtaszek, M., Krawiarz, J., Badania możliwości zastosowania nagniatania tocznego do obróbki wykańczającej kompozytów Al- SiC. Kompozyty, Vol. 7: 2, pp. 87-92, 2007.
  • [9] Nadasi, E., Nowoczesne metody metalizacji natryskowej, Wydawnictwa Naukowo- Techniczne, Warszawa 1975.
  • [10] Starosta, R., Wądołowski, D., Wpływ nagniatania na wybrane własności powłok natryskiwanych metodą „ROTO-TECK”. Zeszyty Naukowe. Akademia Marynarki Wojennej. Vol. 178A, pp. 275-280, 2009.
  • [11] Sandvik Coromant. Katalog główny. Toczenie –frezowanie –wiercenie –wytaczanie -systemy narzędziowe, Sandviken, pp. A39-A40, 2007.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUJ8-0018-0042
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