National Repository of Grey Literature 6 records found  Search took 0.00 seconds. 
Gradienty zbytkových napětí a nanotvrdosti v povrchových vrstvách leštěných vzorků ocelí
Ganev, N. ; Čerňanský, Marian ; Drahokoupil, Jan ; Zubko, P. ; Bláhová, O.
Contribution presents results of analysis of residual stress and nanohardness gradients in surface layers of polished steel samples. It shows, that macrostress, microstrain and microhardness are inhomogeneous towards depth in the polished surface layers.
Měření mechanických vlastností zeolitových mikro-krystalů pomocí instrumentované vnikací zkoušky
Stranyánek, Martin ; Čtvrtlík, Radim ; Brabec, Libor ; Boháč, Petr
The Indentation hardness and the elastic modulus of Silicate-1 zeolite crystals were determined. Dimension of the crystals is 200 μm x 40 μm x 40 μm approximately. Two modification of the Silicate-1 were studied: as-systhesized crystals without organic template.
Testing of the impact load of hard wear resistant coatings
Sobota, Jaroslav ; Fořt, Tomáš ; Grossman, Jan
The dynamic impact wear tester developed in our laboratory has been used to evaluate hard wear resistant coatings. After each test, wear scars were evaluated by means of optical microscope and profilometer. Results of these tests show usability of various types of coatings in dynamic load and enable to optimize the design of the coating/substrate system.
Improvement of mechanical properties of the sintered ceramics by plasma remelting
Ctibor, Pavel
Ways how to improve mechanical properties on a surface of bulk ceramics are drawn. In the experiments the author reach surface treatment by plasma torch producing thermal plasma and usually utilized for plasma spraying. Commercial bulk ceramic materials produced via sintering or casting were tested. The materials were members of ternary systems magnesia - alumina - silica and zirconia - alumina - silica. Before and after thermal treatment the microstructure was studied and the microhardness was measured on materialographically polished cross sections using Vickers indentation (HV) in surfacial layers and also deep inside the bulk body. Slurry abrasion resistance (SAR) was determined according ASTM G 75 standard. Various degree of improvement of HV and SAR was detected on treated samples. The microstructural character of completely remolten surfacial layer, partly influenced intermediate layers and original bulk body is discusses in connection with evaluated mechanical tests.
Povrchové a mechanické vlastnosti organicko/anorganických nanokompositních nátěrů
Špírková, Milena ; Bláhová, O. ; Farkačová, T. ; Benešová, J.
Surface hardness of transparent colorless epoxy-based organic-inorganic nanocomposite coatings was investigated by atomic force microscopy, nanoindentation and the Persoz pendulum test. The influence of mechanical properties on the measured surface characteristics is discussed.

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