667 research outputs found
Properties of TiO2 coatings applied by atomic layer deposition (ALD) on 100Cr6 steel
The paper presents the method of forming TiO2 coatings on 100Cr6 steel using the ALD method and assessing the properties of the obtained coatings. The coatings were assessed in terms of surface morphology, chemical composition, contact angle and tribological properties. The performed tribological tests show that TiO2 coatings are characterized by lower resistance to motion. During measuring the geometric structure of surfaces on samples with TiO2 coating, smaller wear traces were recorded than for 100Cr6 steel. The obtained values of the contact angles prove that the 100Cr6 steel coated with TiO2 is more hydrophobic than the uncoated 100Cr6 steel. TiO2 coatings can be used in low-loaded tribological systems and as barrier coatings
Properties of TiO2 coatings applied by atomic layer deposition (ALD) on 100Cr6 steel
The paper presents the method of forming TiO2 coatings on 100Cr6 steel using the ALD method and assessing the properties of the obtained coatings. The coatings were assessed in terms of surface morphology, chemical composition, contact angle and tribological properties. The performed tribological tests show that TiO2 coatings are characterized by lower resistance to motion. During measuring the geometric structure of surfaces on samples with TiO2 coating, smaller wear traces were recorded than for 100Cr6 steel. The obtained values of the contact angles prove that the 100Cr6 steel coated with TiO2 is more hydrophobic than the uncoated 100Cr6 steel. TiO2 coatings can be used in low-loaded tribological systems and as barrier coatings
Preparation and selected properties of Al88Y8-xFe4+x (x = 0, 1, 2 at. %) Alloys in bulk form
The paper presents selected properties of AlYFe rapidly solidified alloys. Samples in the form of plates, obtained by pressure casting method, were subjected to structural tests in order to determine the mechanical properties of the alloys, as well as their corrosion resistance. The corrosion resistance of samples was examined using polarization tests in 3,5 % NaCl solution at 25 Ā°C. The influence of this corrosive medium on the sampleās surface was analyzed with microscopic observations and energy-dispersive spectroscopy (EDS). The mechanical properties of alloys were determined by Vickers hardness tests. The results showed that the properties of Al88Y8-xFe4+x (x = 0, 1, 2 at. %) alloys are related to changes in the content of alloying elements
Preparation and selected properties of Al88Y8-xFe4+x (x = 0, 1, 2 at. %) Alloys in bulk form
The paper presents selected properties of AlYFe rapidly solidified alloys. Samples in the form of plates, obtained by pressure casting method, were subjected to structural tests in order to determine the mechanical properties of the alloys, as well as their corrosion resistance. The corrosion resistance of samples was examined using polarization tests in 3,5 % NaCl solution at 25 Ā°C. The influence of this corrosive medium on the sampleās surface was analyzed with microscopic observations and energy-dispersive spectroscopy (EDS). The mechanical properties of alloys were determined by Vickers hardness tests. The results showed that the properties of Al88Y8-xFe4+x (x = 0, 1, 2 at. %) alloys are related to changes in the content of alloying elements
Influence of surface roughness on selected properties of the TiAlN coating
The HS6-5-2C steel samples with different surface roughness were used for the tests. After grinding had a roughness parameter of Ra = 0,03 Ī¼m, and after polishing Ra = 0,01 Ī¼m. A TiAlN coating was applied to the substrate prepared in this way. Using a confocal microscope with an interferometric mode, the geometrical structure of the samples was analyzed. The optical strain gauge was used to measure the contact angle. Tribological tests were carried out in conditions of technically dry friction. The polished sample with the coating was characterized by a more stable course of the friction coefficient, lower wear and a smaller wetting angle
A uniform reconstruction formula in integral geometry
A general method for analytic inversion in integral geometry is proposed. All
classical and some new reconstruction formulas of Radon-John type are obtained
by this method. No harmonic analysis and PDE is used
The influence of environmental conditions on the tribological properties of the Ti13Nb13Zr alloy
The paper presents the results of tribological tests of the Ti13Nb13Zr titanium alloy - carried out in the conditions of lubrication with liquids simulating body fluids. Artificial saliva solutions were used for the tests. Two pH values were used ā 7,0 characteristic of a healthy organism and 4,9 - typical for the presence of inflammation. The countersample in the tested friction nodes were Al2O3 balls with a diameter of 6 mm loaded with a normal force of 1 N. The tests obtained showed a strong influence of environmental conditions on the tribological properties of the Ti13Nb13Zr titanium alloy. This applies to both the value of the coefficient of friction and linear wear. In the case of tests carried out under lubrication conditions with an artificial saliva solution at pH 7,0 they were 0,47 and 31,1 Ī¼m, respectively; in the case of a fluid at pH 4,9 they were 25 % and 45 % higher (0,62 and 65,6 Ī¼m)
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