Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 6

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

The Study of Electroless Ni-P/Ni-B Duplex Coating on HVOF-Sprayed Martensitic Stainless Steel Coating

100%
Mindivan F., Mindivan H.
Acta Physica Polonica A
|
2017
|
vol. 131
|
issue 1
64-67
EN
High velocity oxygen fuel sprayed stainless steel coatings have been widely used in various industries to repair damaged components. However, its broad application is limited due to its comparatively low hardness and inferior tribological properties. In this work, electroless Ni-P/Ni-B duplex coating with a thickness of ≈ 40 μm was deposited on surfaces of HVOF-sprayed 420 martensitic stainless steel substrate, and its structural, corrosion and tribological properties were characterized. Experimental results showed that upper Ni-B coating deposited on the surface of first Ni-P layer by duplex treatment exhibited superior hardness, wear and corrosion resistances as compared to the HVOF-sprayed 420 martensitic stainless steel coating with a thickness of about 150 μm.
2
Content available remote

Corrosion and Tribocorrosion Behavior of Cast and Machine Milled Co-Cr Alloys for Biomedical Applications

81%
Mindivan F., Yıldırım M., Bayındır F., Mindivan H.
Acta Physica Polonica A
|
2016
|
vol. 129
|
issue 4
701-704
EN
In this study, the electrochemical behavior and tribocorrosion performance of cobalt-chromium (Co-Cr) alloys produced by different fabrication methods (casting and CAD/CAM milling technique) have been investigated in the laboratory-simulated artificial saliva. The results have shown that the maximum tribocorrosion resistance was obtained for milled Co-Cr alloy because of higher corrosion resistance and hardness of milled Co-Cr alloy compared too those of cast Co-Cr alloy. Moreover, the lowest friction coefficient was achieved for milled Co-Cr alloy.
3
Content available remote

Effect of B_4C Content on the Mechanical and Tribological Performances of Polypropylene

81%
Dike A., Mindivan F., Mindivan H.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
396-398
EN
Boron carbide (B_4C) reinforced polypropylene (PP) was prepared by twin-screw extrusion and injection molding. In the present study, the effect of B_4C content on the mechanical properties and wear behavior of the PP composites was studied. The tribological properties of the PP composites were investigated by a reciprocating wear tester under dry friction conditions. The results of the mechanical and wear test showed that the hardness and yield strength increased with increasing B_4C content, while the incorporation of B_4C into PP largely increased wear and friction under dry sliding. The composites have higher wear rates in comparison with unfilled PP and the greater the difference, the greater are the sliding velocities.
4
Content available remote

Investigation of Thermal Properties of PUF/colored Organoclay Nanocomposites

61%
Gürses A., Doğar Ç., Köktepe S., Mindivan F., Güneş K., Aktürk S.
Acta Physica Polonica A
|
2015
|
vol. 127
|
issue 4
979-983
EN
Recently PF resins can be also prepared by the addition of urea because urea accelerates cure process of PF resin, reduces the cost and improves its strength performance. Clays have long been used as inorganic fillers in polymer systems because of low cost, availability and improved thermal properties of resulting polymer composites. Clay nanocomposites of different types yield a marked increase in a number of properties of thermoplastic and other resins and composites. This study investigates the variation of thermal properties of PUF/colored organoclay nanocomposites with increased colored clay ratio. For this the DSC, XRD, FT-IR and HRTEM analyses were made. The XRD patterns and HRTEM images showed that clay platelets were exfoliated at the lower contents of organoclay, whereas at the higher content of organo clay tactoids were observed. The XRD analysis results implied that the amorphous behaviour increased with increased content of colored organoclay. The DSC thermograms indicated that glassy transition temperature (T_{g}) was increased, appearing prominent crystallization peaks at the lower ratios of organoclay. The T_{g} value was partially decreased and the peak intensities gradually decreased with increased content of clay. The thermogram for composite with clay content of 20% was similar to the thermogram of virgin resin. This can be attributed to the shifting of the textural structure for this composite from prominent crystalline structure to amorphous one.
5
Content available remote

Preparation and Characterization of Urea/Formaldehyde/Rosa Canina sp. Seeds Composites

61%
Gürses A., Karagöz S., Mindivan F., Güneş K., Doğar Ç., Aktürk S.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
368-373
EN
Urea-formaldehyde (UF) resin which is one of the most important wood adhesives is a polymeric condensation product of the chemical reaction of formaldehyde with urea, and considered as the most important type of adhesive resins for the production of particleboards. The present study is aimed to preparation and characterization of urea/formaldehyde/Rosa Canina sp. seeds - and urea/formaldehyde/ Rosa Canina sp. seeds/organo clay composites and also to determine the utility as an alternative and low cost material to manufacture particleboard. The synthesis of various composites was carried out using fresh Rosa Canina sp. seeds, typical agricultural waste, in its changing ratios from 7.7 to 83.3 wt%. Also, some of the composite mixtures were prepared by adding organo clay (0.17-3.3 wt%) in a constant ratio of 1/1 wt of urea and formaldehyde. The structural and mechanical characterization of samples was performed by X-ray diffraction, Fourier transform infrared spectra, high resolution transmission electron microscopy images and measurements of Shore D and scratch hardness. The analysis results conclude that organo clay platelets dispersed as simultaneously intercalated and exfoliated in resin matrix and also the increased organo clay ratio led to increase in the hardness values of samples.
6
Content available remote

Synthesis and Characterization of Phenol/Urea/Formaldehyde and Clay Composites

61%
Doğar Ç., Gürses A., Köktepe S., Mindivan F., Güneş K., Aktürk S.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
374-378
EN
Recently, so-called "phenol-formaldehyde-urea resins", which are generally made only by mechanical blending of UF resin and alkaline type PF resins, have been used as adhesives for the manufacturing of wood products. Faster curing PF resins can be also prepared by the addition of urea during or after the resin synthesis to yield co-condensed phenol-urea-formaldehyde (PUF) resins. In this study, resin/clay composites were prepared by in situ polymerization of phenol(18.2%)-urea(36.3%)-formaldehyde(45.5%) (PUF) with the various ratios of organoclay (7.69-45.45%) and colored organoclay (3.22-20.0%). The objective of our work is the investigation of the effect of addition of both organoclay and colored organoclay at different ratios on the textural characteristics. The composites are characterized by X-ray diffraction, Fourier transform infrared spectroscopy techniques and using high resolution transmission electron microscopy images of the samples. It was found that clay layers exfoliated in the resin matrix.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.