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Year 2009 No 1

Jakubéczyová D., Hagarová M., Vojtko M.
EVAULATION OF ADHESION PROPERTIES OF THIN PVD COATINGS APPLIED ON THE SUBSTRATE PRODUCED BY MELT AND POWDER METALLURGY
Abstract
The paper deals with evaluation of properties of samples with TiAlN coating, which was deposited on two types of steel substrate. Steel STN 419 436 was made by melt technology, steel Böhler K 190 Microclean by powder metallurgy. Thin layer (coating) was applied onto the steel surface by cathode arc technology. This method belongs to PVD (Physical Vapour deposition) process. Thin PVD coatings deposited onto surface of tools and machine parts are widely used in a range of sectors, for example in machine, electrical engineering and medicine. These materials are used in operations which place high demands on hardness, wear resistance and thermal and chemical stability of the surface. Structure, chemical composition a properties of thin layers depend on technological parameters of the PVD process and preparation of steel substrate. High requirements on the quality of thin PVD coatings resulted in development of methods used to evaluate of their properties. Microhardness is one of the important characteristics of mechanical properties of the coated parts. This characteristic was measured by static indentation method according to Vickers. Morphology of the surface was determined by measurement of micro-geometry parameters. The structure of the coated system was observed by scanning electron microscopy. EDX analysis of TiAlN coating was also carried out. The scratch test is one of the basic and most frequent tests for determination of adhesion of thin coating to the substrate surface. This method defines quality of thin layer during its application under practical conditions. Surface of the material after the scratch test was assessed by metallographic analysis in the location where the coating had detached from the substrate.

Keywords: tool steel|PVD|thin layer|hardness|morphology|adhesive properties|
No 1 (2009), p. 15-22
  mag08.pdf (181 kB)
mag08_eng.txt (2 kB)  

Pernis R., Kasala J., Bořuta J.
HOT TORSION TESTS OF CARTRIDGE BRASS MS70
Keywords: brass|cartridge brass|hot formability properties|hot extrusion pressing|strain rate|
No 1 (2009), p. 5-14
  mag01.pdf (161 kB)
mag01_eng.txt (2 kB)  

Némethová L., Vilk J., Kvačkaj T.
INFLUENCE OF SLAB TEMPERATURE TO ADHESION OF FURNACE SCALES
Keywords: scale|oxide layer|heat of material|furnace scale|REM|
No 1 (2009), p. 23-30
  mag03.pdf (384 kB)
mag03_eng.txt (2 kB)  

Petryshynets I., Kováč F., Stoyka V.
INVESTIGATION OF GRAIN BOUNDARY MOTION IN DEPENDENCE OF APPLIED DEFORMATION VALUE
Keywords: grain oriented electrical steels|grain boundary motion|deformation gradient|
No 1 (2009), p. 31-36
  mag04.pdf (511 kB)
mag04_eng.txt (2 kB)  

Horkavcová D., Štěpánek I., Plešingerová B.
PREPARATION OF BIOACTIVE Ca-P COATING ON Ti ALLOY AND MEASUREMENT OF ITS ADHESION BY SCRATCH TEST
Keywords: titanium alloy|calcification|octacalcium phosphate|adhesion|scratch test|
No 1 (2009), p. 37-43
  mag05.pdf (945 kB)
mag05_eng.txt (2 kB)  

Petrík J., Špeťuch V., Trpčevská J., Velgosová O.
THE INFLUENCE OF THE BALL ON THE BRINELL HARDNESS TEST QUALITY
Keywords: calibration|HBS|HBW|uncertainty|t-test|ANOVA|BSI 9001|
No 1 (2009), p. 44-54
  mag06.pdf (253 kB)
mag06_eng.txt (1 kB)  

Panich N.,Wangyao P.
NANOINDENTATION FOR ACCESSING NANOMECHANICAL PROPERTIES
Keywords: nanoindentation|nanomechanical properties|coatings|thin films|
No 1 (2009), p. 55-62
  mag07.pdf (76 kB)
mag07_eng.txt (2 kB)