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1
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Technological Properties of Ceramic Slurries Based on Silicon Carbide with Poly(vinyl alcohol) Addition for Shell Moluds Fabrication in Precision Casting Process

100%
Malek M., Wisniewski P., Szymanska J., Mizera J., Kurzydlowski K.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
528-530
EN
In this work technological properties of ceramic slurries based on silicon carbide powder with solid content 70 wt% were presented. These slurries were prepared for obtaining shell moulds in precision casting of Ni superalloys engine parts. The main binder was dispersion containing nanoalumina particles. Additionally poly(vinyl alcohol) with molecular weight 26000 g/mol as 5 wt% water solution was used as a rheological modifier. To characterize silicon carbide: scanning electron microscopy images, chemical composition, Zeta potential and grain size were studied. Technological properties of ceramic slurries i.e.: plate weight test, viscosity, dynamic viscosity, density and pH were investigated. Properties of silicon carbide based ceramic slurries are very promising and their shell moulds are very perspective for future application in aerospace industry.
2
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In Situ Formation of Ti-TiAl₃ Metallic-Intermetallic Composite by Electric Current Activated Sintering Method

63%
Yener T., Okumus S., Zeytin S.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
917-920
EN
In this study we have investigated fabrication of in situ metallic- intermetallic Ti-TiAl₃ composites from powder mixture containing 40 wt % Ti-Al, 50 wt % Ti-Al and 60 wt % Ti-Al by electric current activated sintering method. Powder mixtures without additive were compressed uniaxially under 130 MPa of pressure and sintered 2000 A current for 20 minutes in a steel mould. Microstructures of sintered samples were investigated by optic and scanning electron microscopes, phases in samples were analyzed by XRD and their hardness was measured by Vickers hardness tester. Optic and scanning electron microscopes investigations showed that microstructures of samples were consisting of two components: Main component was titanium aluminide and other was metallic titanium. Besides this there was a trace amount of aluminium oxide in the sintered body. XRD analyses also demonstrated that main phase is TiAl₃. It was determined that as weight percentage of titanium in the mixture was decreasing, also the amount of metallic titanium has decreased in the sintered body. Additionally, average hardness values of samples were about 500 HV
3
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Influence of High Energy Milling Time on the Ti-50Ta Biomedical Alloy Structure

51%
Matuła I., Dercz G., Zubko M., Prusik K., Pająk L.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
1033-1036
EN
Nickel-free titanium alloys are a promising research direction in the field of biomedical materials. Current literature reports indicate that there is a possibility of using the Ti-Ta alloys in medicine since these alloys have had satisfactory results as far as biocompatibility, resistance to corrosion and mechanical properties are concerned, which is an important aspect while considering the use of this alloy for long-lasting bone implants. This article presents the results of a high-energy milling process with the use of Ti and Ta powders. The ball-milling process was carried out for various times, including 20, 40, 60, 80, and 100 h. The samples were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The research confirmed partial synthesis of the materials during the process of high energy ball milling.
4
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Aberrations of Betanin Sensitized Gelatin Microlenses

51%
Vasiljević D., Murić B., Pantelić D., Panić B.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
592-594
EN
Aberrations of the concave aspherical microlenses are presented. Microlenses are produced by using betanin sensitized gelatin and 532 nm laser irradiation (2nd Nd:YAG harmonic). Aberrations are analyzed by calculation of the longitudinal spherical aberration and the root mean square RMS spot radius. Three presented microlenses had good image quality for the large F number and the moderate field angle.
5
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Facile Synthesis and Characterization of Zinc Tetranitro Phthalocyanine-MWCNTs Nanocomposites with Efficient Visible-Light-Driven Photocatalytic Activity

51%
Wan Y., Chen S., Wang G., Liang Q., Li Z., Xu S.
Acta Physica Polonica A
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2016
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vol. 130
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issue 3
785-790
EN
Novel zinc tetranitro-phthalocyanine (ZnTNPc) supported by multi-walled carbon nanotubes hybrid composites were facilely prepared by a method of ultrasonic impregnation and their photocatalysis behavior was studied. The as-prepared ZnTNPc-MWCNTs composites were characterized by scanning electron microscopy, X-ray diffraction, diffuse reflectance spectra, transmission electron microscopy, thermogravimetric analysis, and the Fourier transform infrared spectra. The results showed that the ZnTNPc was not only grown on the multi-walled carbon nanotubes but also uniformly disturbed without aggregation. Compared with pure ZnTNPc and MWCNTs, ZnTNPc-MWCNTs nanocomposites presented a significantly enhanced photocatalytic activity for the degradation of rhodamine B under visible-light irradiation. Furthermore, a possible mechanism for the photodegradation of rhodamine B was also proposed.
6
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Olivine Particle Reinforced Polyphenylene Sulfide Matrix Composites

51%
Sahin A., Sinmazcelik T.
Acta Physica Polonica A
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2017
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vol. 131
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issue 3
481-483
EN
Polyphenylene sulfide is a semicrystalline thermoplastic polymer. It offers an excellent balance of properties, including chemical resistance, high temperature resistance, dimensional stability, electrical characteristics and flowability. Polyphenylene sulfide must be filled with reinforced agents, such as fibers and fillers, to overcome its inherent brittleness. Because of its low viscosity, polyphenylene sulfide can be molded with high loading of fillers and reinforcements. These fillers and reinforcements will make a difference in the electrical properties, strength, dimensional stability, surface properties and overall cost. Because of its inherent flame retardancy, polyphenylene sulfide is ideal for high temperature electrical applications. On the other hand, olivine is volcanic based mineral with porous structure, which consists of forsterite (Mg₂SiO₄) and fayalite (Fe₂SiO₄). Both, its lower price compared to other minerals and harmlessness to human health increase the usage of olivine from day to day. For this reason olivine reinforced polyphenylene sulfide composite samples were manufactured at various weight ratios (0, 1, 3, 5 and 10 wt.%). Mechanical and scratch properties of samples were investigated and according to test results, it is concluded that olivine mineral can be used as a reinforcing agent material instead of other conventional fillers.
7
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New Type of Composite Gyrotropic Metamaterial

51%
Paśko W., Zięba P., Tralle I., Çoruh A.
Acta Physica Polonica A
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2017
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vol. 132
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issue 1
121-123
EN
In this work we examined the possibility of fabricating the metamaterial in a relatively simple way. Our idea was to use the three-component mixture of ingredients, where one of them is responsible for the negative permeability μ(ω) of hypothetical metamaterial, while the other two cause the negative value of effective permittivity ε(ω). In our previous work, we considered Hg_{1-x}Cd_xTe semiconductor compound as one of the ingredients of mixture. As fabrication of the Hg_{1-x}Cd_xTe is related to using mercury which is very poisoning, we tried to exclude this material. In the work we proved by numerical simulations the possibility of substituting mercury cadmium telluride by Pb_{1-x}Sn_xTe. We have shown by computer simulations that by the proper fitting of the parameters, e.g. the radius of nanoparticles, their magnetic moments, the relative concentration of ingredients, etc., it is possible to obtain the metamaterial with negative refraction index in a relatively broad range of temperatures and magnetic fields. The last seems to be very promising in terms of practical applications of metamaterials.
8
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Imaging Properties of Laser-Produced Parabolic Profile Microlenses

51%
Vasiljević D., Murić B., Pantelić D., Panić B.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
993-999
EN
Imaging properties of the concave microlens are presented. Microlenses are produced by using tot'hema eosin sensitized gelatin and 532 nm laser irradiation (2nd Nd:YAG harmonic). Imaging properties of microlenses are analized by calculation: the RMS wave front aberration, the diffraction point spread function cross section and the spot diagram. The obtained microlenses had excellent, near diffraction limited, performance for the moderate field angles.
9
Content available remote

The Study of the Behavior of Constrained Groove Pressed Magnesium Alloy after Heat Treatment

51%
Zimina M., Bohlen J., Letzig D., Kurz G., Poková M., Knapek M., Zrník J., Cieslar M.
Acta Physica Polonica A
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2015
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vol. 128
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issue 4
775-778
EN
In this work twin-roll cast AZ31 magnesium strip of thickness 5.6 mm was subjected to the heat treatment and further constrained groove pressing. A comparison of the microstructure and microhardness of as-cast, constrained groove pressed and annealed material was carried out. The twin-roll cast strip exhibits an inhomogeneous structure which is replaced by a finer and uniform recrystallized one after aging at 450°C for 10 h. A significant increase of the microhardness was observed accompanied by a pronounce grain refinement. Nevertheless, the distribution of the grain size is unequal along the specimen width. Thermal stability of the deformed structure during subsequent annealing was investigated. It was shown that higher annealing temperatures result in a formation of a more uniform recrystallized structure and in a significant drop of microhardness down to the values obtained for as-cast alloy.
10
Content available remote

Mechanical Properties of Soft Magnetic Composites at the Temperature of Liquid Nitrogen

51%
Przybylski M., Kapelski D., Ślusarek B.
Acta Physica Polonica A
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2017
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vol. 131
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issue 5
1199-1203
EN
Soft magnetic composites are used in a wide range of applications working in different environmental conditions, between others, in different temperatures. Nowadays, devices often work in cryogenic temperatures. The paper shows influence of liquid nitrogen temperature on mechanical properties of soft magnetic composites prepared from ABC100.30 powder bonded by epoxy resin. Mechanical properties of samples were measured in room and liquid nitrogen temperatures. Compressive strength and transverse rapture strength increase with decreasing temperature. This type of soft magnetic composite can be applied in magnetic circuits of devices working in cryogenic temperatures. The results of measurement show that new devices, especially electric machines, working in these temperatures can be designed with higher mechanical loadings than devices working at room temperature.
11
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Quasicrystal-Polymer Composites for Additive Manufacturing Technology

38%
Kenzari S., Bonina D., Degiovanni A., Dubois J., Fournée V.
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vol. 126
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issue 2
449-452
EN
We present a new niche application of quasicrystalline powders that leads to a commercially successful development of polymer-matrix composites. The process is based upon selective laser sintering, which is one of the current most powerful additive manufacturing technologies in use in the mechanical industries. Characteristics of the materials produced, such as porosity, friction and wear against hard steel, are evaluated and compared to the state of the art. Insight into the production of metal-matrix composites, using a variant of the technology, is also given.
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