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Tribological properties of selected ceramic coatings

100%

Vinas J. , Brezinova J.

tom z. 81 [277]

121-126

The contribution deals with methods of plasma sprayed ceramic materials evaluation. There were evaluated ceramic coatings A 99, Cr2O3 and Cr2O3 + 5% TiO2. Influence of the interlayer NiCr on the functional properties of sprayed coatings was also studied. There were determined thickness, microhardness and adhesion of particular coatings together with their resistance to abrasive wear and thermal cyclic loading.

Utiliztion of fractal analysis in bonded joints strength prediction

80%

Kniewald D. , Guzanova A. , Brezinova J.

tom z. 68 [231]

89-94

The contribution deals with evaluation of blasted surfaces assigned for bonding joints formation. It was observed, that surface quality evaluation only by roughness parameter Ra is insufficient. Experimental results shows, there is not direct proportion between surface roughness and bonding joints strength, because surface roughness and surface irregularity are not identical terms. There is presented fractal analysis as a suitable tool for surface irregularity evaluation. Conclusion presents fractal dimension as additional parameter for bonding joints strength prediction.

Hard surfacing repairing layers in erosive wear process

80%

Vinas J. , Brezinova J. , Guzanova A. , Lorincova D.

tom z. 81 [277]

127-134

The contribution deals with evaluation of tribological properties of two types three-layer hard surfacing claddings with various structural bases. There were used samples made out from S235JRG2 EN10025-94 as reference material. Within the frame of experimental works there was realised metallographic analysis, measuring of hardness and micro-hardness of claddings before and after erosive wear loading. Erosive wear was evaluated by simulation of erosive action. Aim of research was to determine influence of erosive particle impact angle and structural composition of claddings on their wear resistance.

High solid coatings quality in selected corrosion media

80%

Malejcik J. , Brezinova J. , Guzanova A.

tom z. 81 [277]

35-38

The ecological approach to surface treatments with organic coatings requires a reduction in the proportion of coatings containing volatile organic solvents, VOCs - Volatile organic compounds. One of possible solutions is to substitute solvent paints by water diluted and high-proof materials. The contribution presents the results of research aimed at establishing high solid coatings quality by accelerated laboratory tests in conditions of artificial atmosphere.