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Year 2012 No 4

P. Gavendová, F. Kováč, I. Petryshynets, M. Sopko, M. Molnárová
NANOHARDNESS OF GRAINS OF ELECTROTECHNICAL STEEL AT ELEVATED TEMPERATURE
Keywords: non-oriented electrotechnical steel|high temperature nanoindentation|nanohardness|grain orientations|
No 4 (2012), p. 156-161
  mag08.pdf (483 kB)
mag08_eng.txt (777 B)  

J. Viňáš, Ľ. Kaščák, D. Draganovská
EVALUATION OF CORROSION RESISTANCE OF MIG BRAZED STEEL SHEETS
Keywords: brazing|corrosion|surface|coating|deep-drawing sheets|
No 4 (2012), p. 162-171
  mag02.pdf (788 kB)
mag02_eng.txt (1 kB)  

Ľ. Kaščák, E. Spišák, J. Mucha
EVALUATION OF PROPERTIES OF JOINTS MADE BY CLINCHING AND SELF-PIERCING RIVETING METHODS
Keywords: joining|tension test,|metallography|microhardness test|
No 4 (2012), p. 172-180
  mag07.pdf (1 MB)
mag07_eng.txt (1 kB)  

J. Brezinová, A. Guzanová, J. Malejčík
SELECTED PROPERTIES OF COMPOSITE COATINGS BASED ON ZrSiO4
Keywords: plasma spraying|composite ceramic coatings|zircon silicate|adhesion|porosity|
No 4 (2012), p. 181-190 Vydáva eBooks
  mag04.pdf (1 MB)
mag04_eng.txt (699 B)  

D. Jakubéczyová, M.Hagarová
THE STUDY OF TWO TYPES OF PVD COATINGS ON THE SUBSTRATE MADE BY POWDER METALLURGY
Abstract
This study investigates the properties and cutting performance with thin layers applied by two PVD technologies. PVD methods ARC and LARC were used for the deposition of thin coatings onto tools prepared by powder metallurgy (PM). Advanced types of layers - multilayer AlTiCrN and nanocomposite type of nc-AlTiN/Si3N4 layer - were analyzed by standard techniques for surface status and quality assessment – roughness, hardness, layer thickness, chemical composition by GDOES, tribological properties at room and elevated temperature. Durability testing of the cutting tools was carried out according to the standard ISO 3685-1999. The nanocompositenc-AlTiN/Si3N4 layer had lower roughness when compared to monolayer AlTiCrN which leads to higher hardness and better layer quality. The HV0.5 hardness values reached nearly 26 GPa. The results showed a two to three times longer durability of the cutting tools in comparison with equivalent uncoated PM and traditional materials. The deposited coatings contributed to the improvement of their durability.

Keywords: cutting tool|PVD layer|roughness|hardness|GDOES|Pin-on-Disc|durability|
No 4 (2012), p. 191-199
  mag05.pdf (732 kB)
mag05_eng.txt (1 kB)  

J. Slota, M. Jurčišin, E. Spišák
NUMERICAL AND EXPERIMENTAL SPRINGBACK DETERMINATION OF SHEET METALS IN AN AIR BENDING PROCESS
Keywords: springback|FEM|sheet metal forming|autoform|pam-stamp|numerical simulation|
No 4 (2012), p. 200-209
  mag06.pdf (707 kB)
mag06_eng.txt (784 B)