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1
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Cavitation Damage Behavior in Seawater for Al-Mg Alloy Arc Thermal Spray Coating with Mg Content

100%
Park I., Kim S.
|
EN
Al arc thermal spray coating materials are widely used to prevent the corrosion of steel structure materials in marine environment. To improve the durability of the Al alloy thermal spray coating layer, Al-Mg alloy arc thermal spray coating was performed with different Mg contents. Furthermore, the cavitation experiment was performed in natural seawater to evaluate the durability of the thermal spray coating layer, and the damaged surface was analyzed with a scanning electron microscope and a 3D microscope. As a result, the durability of the Al-Mg alloy thermal spray coating layer improved by the addition of Mg, and the Al-3%Mg thermal spray coating layer presented the best characteristics.
2
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Carbon Deposit Formation in Normal-Pressure Electrical Discharges in Hydrocarbons

80%
Sobczyk A., Jaworek A.
Acta Physica Polonica A
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2009
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vol. 116
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issue S
S-136-S-138
EN
The process of synthesis of carbon deposits from hydrocarbon vapours in low-current electrical-discharge plasma was investigated in the paper. The carbon deposits were effectively synthesised in discharge of positive polarity generated between a stainless steel needle and a plate made of nickel alloy, for the discharge current ranged from 0.1 mA up to 3 mA. The experiments were carried out at normal pressure in cyclohexane vapours with argon as carrier gas. The process of synthesis of carbon deposits was investigated using optical emission spectroscopy.
3
Content available remote

SN-series Pseudospark Switches, Operating Completely without Permanent Heating. New Prospects of Application in Pulsed Power

80%
Bochkov V., Bochkov D., Dyagilev V., Ushich V.
Acta Physica Polonica A
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2009
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vol. 115
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issue 6
980-982
EN
Since 1990s the process of exclusion of gas-discharge and vacuum switches (GDSs and VSs) from pulsed power systems has been conditioned by two major factors - insufficient service time and necessity to supply filament circuits of GDSs and VSs. In the report, design and long-term test results of pseudospark switches (PSSs) are presented. The PSSs are to a great extent free of the mentioned shortcomings; in particular, the switches are capable of operating without filament, providing a wide variety of perspective applications of the tubes in pulsed power.
4
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Effect of Surface Modification by Ammonia Plasma on Vascular Graft: PET Film and PET Scaffold

80%
Öteyaka M., Chevallıer P., Robıtaılle L., Laroche G.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
125-127
EN
Nowadays, poly (ethylene terephthalate) (PET) textiles, either knitted or woven, are largely used as substitutes for replacement of medium and large calibre (10-40 mm) arteries. Unfortunately, these substitutes do not perform well when they are used to replace small diameter arteries due to thrombogenicity and compliance mismatch issues. Surface treatments were often used as the first step to solve thrombogenicity issues. For example, low pressure ammonia plasma processes can provide modification of the top ≈ 10 - 50 Å of polymer surface without affecting bulk properties of materials. This work compared ammonia plasma surface modifications of PET film (flat surface) and PET scaffolds (porous surface). Plasma treatments lead to a higher amount of nitrogen as well as amino groups on scaffolds compared to films. N/C maximum was reached for PET film and scaffold after plasma treatments of 5 s and 100 s, respectively. Highest amine concentration on films and scaffolds were obtained at short treatment time, specifically 1 s. In addition, high resolution spectra of C 1s confirmed that amino groups were mainly grafted on aromatic rings. Nodule formation was observed after plasma treatment with atomic force microscopy. Their size and shape increased with longer treatment time.
5
Content available remote

Properties of the Surface Alloyed AISI 1020 Steel with Fe_{(15-x)}Mo_{x}B_5 Alloy

70%
Abakay E., Sen S., Sen U.
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vol. 125
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issue 2
584-586
EN
It is now well established that considerable improvement in the mechanical/chemical properties of near surface regions of materials can be achieved by the process of surface alloying. In the present study, surface alloying treatment with molybdenum and boron on the surface of the AISI 1020 steel was realized by the technique of tungsten inert gas welding. Ferrous boron alloy and ferrous molybdenum were used for surface alloying treatment. Before the treatment, ferrous alloys were grinded and sieved to be smaller than 45 μm. Prepared powder was pressed on the steel substrate and melted by tungsten inert gas welding for surface alloying. Coated layers formed on the steel substrate were investigated using optical and scanning electron microscopy, X-ray diffraction analysis and Vickers microhardness testers. It was shown that surface alloyed layer has composite structure including steel matrix and well distributed boride phases. Borides formed in the coated layers have a small precipitated structure and distributed in the grain boundaries as continuous phases. X-ray diffraction analyses show that coated layers include Fe_2B, Fe_{13}Mo_2B_5, Mo_2FeB_4, and iron.
6
Content available remote

Wear Properties of the Surface Alloyed AISI 1020 Steel with Fe_{(15-x)}Mo_{x}B_5 by TIG Welding Technique

70%
Abakay E., Sen S., Sen U.
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vol. 125
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issue 2
587-589
EN
Surface alloying caused the improvement in the mechanical/chemical properties of near surface regions of the steels. In the present study, surface alloying treatment with boron, molybdenum, and iron on the AISI 1020 steel was realized by the technique of TIG welding. Ferrous boron, ferrous molybdenum, and Armco iron were used for surface alloying treatment. Before the treatment, ferrous alloys were ground and sieved to be smaller than 45 μm. The powders were mixed to be composed of Fe_{(15-x)}Mo_{x}B_5, where x = 1, 3, and 5 (by at.%). Prepared powders were pressed on the steel substrate and melted by TIG welding for surface alloying. Wear tests of the surface alloyed AISI 1020 steels were realized against WC-Co ball using by ball-on-disk method under the loads of 2.5, 5, and 10 N at the sliding speeds of 0.1 m/s for 250 m sliding distance. Friction coefficient and wear rates of the surface alloyed steel with Fe_{(15-x)}Mo_{x}B_5 alloy powder are changing between 0.30 and 0.80 and 5.86 × 10^{-5} mm^3/m to 2.52 × 10^{-3} mm^3/m depending on applied load and alloy composition, respectively.
7
Content available remote

Wear Properties of the Surface Alloyed AISI 1020 Steel with Vanadium and Boron by TIG Welding Technique

61%
Abakay E., Sen S., Sen U.
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vol. 125
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issue 2
251-253
EN
It is now well known that surface alloying caused improvement in the mechanical/chemical properties of near surface regions of materials. In the present study, surface alloying treatment with boron, vanadium and iron on the AISI 1020 steel was realized by the technique of TIG welding. Ferrous boron, ferrous vanadium and Armco iron were used for surface alloying treatment. Before the treatment, ferrous alloys were ground and sieved to be smaller than 38 μm. The powders were mixed to be composed of Fe_{15 - x}V_{x}B_5, where x = 1, 3, and 5 (by at.). Prepared powders were pressed on the steel substrate and melted by TIG welding for surface alloying. Coated layers formed on the steel substrate were investigated using scanning electron microscopy, X-ray diffraction analysis and Vickers microhardness testers. It was shown that the surface alloyed layer has a composite structure including steel matrix and eutectic borides. Wear tests of the surface alloyed AISI 1020 steels were realized against WC-Co ball using ball-on-disk method.
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