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Wyświetlanie 1-10 z 41
Tytuł:
Epidemiological characteristics, seasonality, trends of dog bite injuries, and relationship with meteorological data
Autorzy:
Yılmaz, S.
Delice, O.
Yılmaz, S.İ.
Powiązania:
https://bibliotekanauki.pl/articles/28761705.pdf
Data publikacji:
2023
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2023, 30, 2; 229-234
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Naturally and Synthetically Derived Hydroxyapatite Powders
Autorzy:
Yelten, A.
Yilmaz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1032536.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
Opis:
Hydroxyapatite (HA) constitutes the mineral component of the hard tissues such as bone and teeth. HA is a bioactive ceramic material and can form biochemical bonds with tissues. It is possible to produce HA powders either from natural sources or by using synthetic chemicals. Wet chemical precipitation technique is an ideal method to practically and economically synthesize HA powders. Calcium hydroxide (Ca(OH)₂) and ortho-phosphoric acid (H₃PO₄) solutions were used as the calcium and phosphorus sources to obtain the HA powders. Acid-alkaline reactions between starting materials were carried out at three different reaction temperatures (room temperature, 50-60°C range and 70-80°C range) which may affect the microstructure of the produced powders. The procedure of HA powders preparation from natural sources consists of several steps: in the order of deproteinization of bovine bones in NaOH, washing the deproteinized bovine bones, calcination of the washed bones, and grinding the calcined bones, respectively. In this study, HA powders derived from bovine bones and HA powders obtained through the wet chemical precipitation method were compared in terms of their chemical, microstructural and molecular bonding properties by applying various characterization techniques such as X-ray diffraction, scanning electron microscope-energy dispersive spectroscopy, and the Fourier transform infrared spectroscopy.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 55-58
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Granite Based Glass-Ceramic Materials
Autorzy:
Bayrak, G.
Yilmaz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1194689.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Fs
62.20.-x
61.05.cp
Opis:
In this study, production possibility of glass and glass-ceramic produced from granite was investigated. The composition of granite based glass bath mixture was 50 wt% granite, 25 wt% dolomite and 25 wt% sodium carbonate. Composition that was grounded and mixed in a ball mill for 2 h was melted at 1500C for 1 h. Glass samples were heat treated for crystallization to produce glass-ceramic materials at 800°C, 900C and 1000C for 2 h to promote internal crystallization. Phase identifications of glass and glass-ceramic materials were investigated by X-ray diffraction analysis. Moreover, hardness and fracture toughness measurement of glass and glass-ceramic materials were applied. Granite based materials after that melting and casting process was found amorphous state by characterization with X-ray diffraction analysis. After the heat treatment processes, crystal phases settled out in glass matrix were also determined in granite based materials. Moreover, values of hardness and fracture toughness increasing were detected by heat treatment schedule.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 623-625
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sintering Behavior and Machinability in Mica Glass-Ceramic of the System $SiO_2-Al_2O_3-MgO-K_2O-B_2O_3-F$
Autorzy:
Ercenk, E.
Yilmaz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1293704.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
68.37.Hk
81.20.Ev
81.20.Wk
81.05.Je
81.05.Mh
Opis:
Mica glass-ceramic was prepared by sintering method from in the $SiO_2-Al_2O_3-MgO-K_2O-B_2O_3-F_2$ system. The sintering behavior and machinability of a glass-ceramic composition were examined. The starting materials were mixed and milled in an alumina ball mill for 2 h. Then the powders were sieved to obtain grain sizes smaller than 75 μm. For the shaping process, disc samples were prepared by pressing at 100 MPa. The pressed discs were sintered at temperatures in the range from 900 to 1200C for 2 h in an electric furnace using a heating rate of 5°C/min. X-ray diffraction analysis, scanning electron microscopy, and machinability tests for characterization were performed on sintered samples. The results showed that all samples exhibited similar phases formation and good machinability.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 629-631
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of CBC and G-POSS on Tribological Behaviour of Polyamide 6 and Short Glass Fiber Reinforced Polyamide 6 Composites
Autorzy:
Gul, O.
Yilmaz, S.
Yilmaz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1194067.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Pq
81.05.Qk
Opis:
In this study, effect of glycidylisobutyl oligomeric silsesquioxane (G-POSS) and 1.1'-carbonyl-bis-caprolactam (CBC) (1 wt.%) on the friction and wear performance of polyamide 6 (PA6) and short glass fiber (SGF) (10 and 20 wt.%) reinforced PA6 composites were investigated. Adhesive wear tests were carried out by using a tribometer in block-on-ring configuration (ASTM G77), in sliding conditions, without lubricants and in air. Tests were carried out at sliding speed of 1.6 m/s (511 rpm) and applied load values of 25, 50 and 75 N. Wear rate was calculated using weight loss per unit sliding distance. The results showed that, the friction force increases with the increasing load. It was found that the wear resistance of PA6 improved considerably after doping with CBC.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1121-1123
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Friction and Wear Properties of Plasma Sprayed YSZ/Ni-Cr-Al Coated 6063-T6 Aluminum Alloy
Autorzy:
Erzi, E.
Dispinar, D.
Yilmaz, S.
Powiązania:
https://bibliotekanauki.pl/articles/383089.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloy
mechanical properties
abrasive wear
plasma spraying
YSZ coating
stop aluminium
właściwości mechaniczne
zużycie ścierne
natryskiwanie
powłoka YSZ
Opis:
In this study T6 heat treated 6063 aluminum alloys were used as substrate material. In order to form a bond between the substrate and the main coating, all samples were coated with Ni-Cr-Al powders. 8 wt% Yttria Stabilized Zirconia powders (YSZ) were coated with plasma spray technique. Thickness of YSZ was 150 m and bond coating was 36 m. XRD and SEM-EDS analyses were performed to characterize the coating layers. These YSZ coated and uncoated samples were subjected to wear testing under different spindle speed, loading and working distance. Wear test results were compared with the kinetic friction coefficients and weight loss values. Wear marks on YSZ coated and uncoated samples were investigated by SEM analysis. By coating with plasma spray technique, the wear resistance of Al alloys was increased without changing the friction coefficient. It was found that spindle speed had significant effect over the wear properties than the load applied. By YSZ coating, wear properties were increased 10 times.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 168-174
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Machinable Glass-Ceramics Produced from Vermiculite
Autorzy:
Önen, U.
Ercenk, E.
Yılmaz, Ş.
Powiązania:
https://bibliotekanauki.pl/articles/1033368.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Pj
Opis:
In this study, machinable glass-ceramics were produced from vermiculite and K₂CO₃, SiO₂, Al₂O₃ and MgF₂ as additives by melting process. The starting materials were mixed together and milled in a mill with alumina ball for 2 h. The mixed powders were melted by aluminum crucible at 1500°C. The melted glass was cast into graphite mold, and then it was exposed to crystallization heat treatment for glass-ceramic transformation. The glass-ceramic samples were characterized with X-ray diffraction analysis, scanning electron microscopy, mechanical tests such as hardness, fracture toughness and machinability test. The results indicate that machinability properties can be obtained from vermiculite based glass-ceramic with some additives.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 168-170
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sintering Behavior and Machinability Properties of Industrial Waste Materials Based Glass-Ceramics
Autorzy:
Bayrak, G.
Ercenk, E.
Yilmaz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1401375.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Fs
81.05.Je
81.05.Mh
81.20.Ev
81.20.Wk
Opis:
Glass-ceramics were produced by sintering method from industrial waste materials such as fly ash, blast furnace slag and boron waste. The sintering behavior and machinability of glass-ceramic compositions were investigated. Additives were added to waste materials for enhancement of machinability and sintering properties. All starting materials were mixed by ball milling for 2 h using alumina media. The mixed and milled powders were sieved to grain sizes smaller than 75 μm and pressed at 100 MPa. The pressed samples were sintered at 900°C, 1000°C and 1100°C for 1 h in an electric furnace using a heating rate of 5°C/min. Some characterization tests such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and machinability tests were performed on sintered samples. The results indicated that all samples exhibit good sintering and machinability properties.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1346-1348
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Perlite Addition on Erosive Wear Behavior of Alumina Ceramics
Autorzy:
Tas, S.
Ercenk, E.
Yilmaz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1182871.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Je
81.05.Mh
46.55.+d
62.20.F-
81.20.Ev
Opis:
In this study, the effects of perlite addition on mechanical properties and wear resistance of alumina ceramics were investigated. Alumina powders including perlite 5%, 10%, 15%, 20% and perlite free were prepared. These powders were shaped as rectangular by using uniaxial pressing system under the load of 100 MPa. The samples were sintered at 1400°C-1550C for 2 h and were subjected to some mechanical tests such as hardness and fracture toughness. X-ray diffraction analysis was employed to determine the crystalline phases. Bulk densities of the samples were measured. In addition, erosive wear test was performed to investigate the erosive wear resistance of the samples. The wear test results were presented depending on different sliding speed and sintering temperature. These results showed that perlite addition has a positive effect on erosive wear resistance of the alumina ceramics, generally.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 632-634
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Wear Properties of FeCrC, FeW and Feti Modified Iron Based Alloy Coating Deposited by PTA Process on AISI 430 Steel
Mikrostruktura i właściwości zużycia modyfikowanych powłok stopowych na bazie żelaza FeCrC, FeW i FeTi nakładanych metodą PTA na stal AISI 430
Autorzy:
Teker, T
Karataş, S.
Yilmaz, S. O.
Powiązania:
https://bibliotekanauki.pl/articles/355642.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PTA
AISI 430
surface coating
ferrytyczna stal AISI 430
powłoka kompozytowa
Opis:
The plasma transferred arc (PTA) process was used for developing wear resistance of AISI 430 steel substrate. Appropriate quantities of FeCrC, FeW and FeTi powders were combined to create conditions that synthesized M7C3 particles into reinforced Fe-based composite surface coating. The phase transformations on new created coated surfaces were comprehensively examined by using a combination of scanning electron microscopy (SEM), microanalysis by energy dispersive spectrometry (EDS), X-Ray diffraction (XRD), microhardness and abrasive wear tests. The microstructure studies of the superficial layers of the coating revealed presence of a mixture of the dendritic phase structure of austenite (γ) and fine eutectic M7C3 carbides. The results show that; the concentrations of the elements (Cr, W, Ti) added as ferroalloys, the size of dendrites formed in the coated surface, the change of hardness of the coated surfaces, the carbide volume rate and thickness of the coating changed by the variation of the processing parameters (ratio of reinforcement particulates and heat input).
Technika PTA została zastosowana jest do podwyższania odporności na zużycie podłoży ze stali AISI 430. Odpowiednie ilości proszków FeCrC, FeW i FeTi połączono w celu stworzenia warunków, w których syntetyzowane są cząsteczki M7C3 zbrojące powłoki kompozytowe na bazie Fe. Przemiany fazowe w nowo utworzonych powlokach zostały szczegółowo zbadane za pomocą kombinacji skaningowej mikroskopii elektronowej (SEM), mikroanalizy spektrometrią dyspersji energii (EDS), dyfrakcji rentgenowskiej (XRD), mikrotwardości i testów ścierania. Badania mikrostruktury wierzchnich warstw powłoki wykazały obecność mieszaniny struktury dendrytycznej austenitu (γ) i drobnych eutektycznych węglików M7C3. Wyniki pokazują, że: stężenie pierwiastków (Cr, W, Ti) dodanych jako żelazostopów, wielkość dendrytów utworzonych w powłoce, zmiany twardości powłoki, szybkość objętościowa węglików i grubość powłoki zmieniają się ze zmianą parametrów procesu (stosunek cząstek wzmacniających i mocy cieplnej).
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 3; 925-933
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 41

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