30 research outputs found
Micromechanical testing of Mo‐B‐C layers prepared by magnetron sputtering
Based on attractive mechanical properties of transition metal diborides the group of X2BC ternary compounds (X = Ti, V, Zr, Nb, Mo, Hf, Ta and W) became subject of theoretical calculations [1-3] and lately proved their applicability experimentally [4]. X2BC with X = Mo, Ta and W are the most promising candidates for protection of cutting and forming tools due to their unusually stiffness and moderately ductility. These properties can be understood by considering the electronic structure and particularly the extreme anisotropy (orthorhombic crystal lattice with a=0.309nm, b=1.735nm, c=0.305nm).
Please click Additional Files below to see the full abstract
Study of mechanical properites of nanostructured polymer coatings prepared using plasma enhanced chemical vapor deposition
The aim of the present work was to deposit transparent polymer SiOxCyHz protective coatings from hexamethyldisiloxane/ oxygen mixtures in capacitively coupled glow discharge. The coatings prepared under dusty plasma conditions showed nanocomposite character. Complex characterization of the local mechanical properties was carried out on the prepared samples from nano to microscale using indentation techniques. The coatings were very elastic, they exhibited high elastic recovery and low plastic deformation even at indentation depths approaching the coating thickness
Studium mechanických vlastností NCD vrstev
The aim of the paper was to deposit nanocrystalline diamond (NCD) films with low surface roughness, high hardness and fracture toughness by microwave PECVD in the ASTEX type reactor from mixture of methane and hydrogen
Thermomechanical stability of DLC/SiOx films
Thermomechanical stability of DLC/SiOx films
Instrumentovaný indentační test v nano- a mikroměřítku
Several materials were chosen to span a wide range of hardness and structure,including pure copper,nickel,titanium,cadmium,zinc and silver.Nanoindentation hardness and microhardness values in wide interval of loads,measured by DSI method and classical Vickers microhardness method were compared in view of indentation Size Effect
Studium mechanických vlastností gradovaných amorfních DLC povlaků deponovaných PECVD
For optimisation of performance of the coating there is necessary to optimise the following materials parameters: the elastic modulus, hardness, surface strength, film fracture toughness and film-substrate adhesion. We proposed to protect the substrate surface with graded coating, which has monotonically graded elastic modulus and Poisson's ratio
Deposition and Characerization of Protective DLC Coatings on Viscoelastic Substrates
Deposition and characerization of protective DLC Coatings on viscoelastic substrates
Studium mechanických vlastností DLC tenkých vrstev deponovaných v jedno a dvoufrekvenčním kapacitním výboji
Nanostructured diamond-like carbon coatings were deposited on several different substrate materials (silicon, glass, polycarbonate and steel) in single (13.56 MHz) and dual capacitive r.f. discharges (LF=100-300kHz, HF =13.56 MHz). The objective of our study was to find the optimum combination of the high and low frequency (continuous or pulsed) excitation enabling to cover uneven substrate surfaces and significant lowering of the internal stress in films