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Tytuł:
Warunki wytwarzania laminarnej strugi plazmowej za pomocą łuku ściśniętego
Generate conditions for laminar plasma jet with the use of constricted arc
Autorzy:
Kruczinin, A.M.
Sawicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/320205.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
łuk elektryczny
plazma termiczna
plazmotron laminarny
electric arc
thermal plasma
laminar plasma torch
Opis:
W artykule podano warunki powstawania i stabilizacji laminarnej strugi plazmowej na wyjściu kanału wyładowczego plazmotronu łukowego. Rozpatrzono przypadki różnego wykonania konstryktora sekcjonowanego i pracę plazmotronów z różnymi gazami plazmotwórczymi. Określono racjonalne wartości prądu roboczego i strumienia masy gazu, zapewniające długą żywotność aparatu i stabilność strugi plazmowej. Utworzono model matematyczny łuku ściśniętego i określono rozkład strumieni cieplnych w kanale plazmotronu. Obliczono parametry generatora strugi laminarnej w stanie krytycznym rozpadu strugi.
The paper describes conditions for generation and stabilization of laminar plasma jet on the channel discharge outlet in an arc plasmatron. Different cases of making sectioned constrictor and work regimes for plasmatrons with different plasmagenic gases were considered. The rational values of operating current and gas mass flow that assures long life of the apparatus and the stability plasma jet were defined. The model of the constriction arc was built and distribution of heat fluxes in the plasmatron channel was determined. Parameters of the laminar jet generator in the critical state of the break-up jet were calculated.
Źródło:
Elektrotechnika i Elektronika; 2005, 24, 1; 60-68
1640-7202
Pojawia się w:
Elektrotechnika i Elektronika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological Studies on AlCrFeCuCoNi High Entropy Alloy Surface Coated on Ti-6Al-4V Using Plasma Transferred Arc Technique
Autorzy:
Prabu, G.
Duraiselvam, Muthukannan
Powiązania:
https://bibliotekanauki.pl/articles/2106576.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium alloy
high entropy alloy
plasma transferred arc
PTA
alloying
wear mechanism
Opis:
AlCrFeCuCoNi high entropy particles were alloyed on Ti-6Al-4V surface using Plasma transferred arc (PTA) process. PTA alloyed surfaces were investigated for their phase formation, microhardness improvement and wear behaviour. The various wear mechanism and their corresponding surface roughness were studied. The results revealed that the dual phase of BCC and FCC microstructure along with some intermetallic compounds were grown in the alloyed region through the PTA technique and good metallurgical bonding of the alloyed region with the base material were achieved. The PTA alloyed region exhibited a hardness of 718 HV0.2 which is 2.2 times higher than the hardness of base material. The PTA alloyed samples showed higher wear resistance due to the solid solution strengthening as the HEA has high entropy of mixing that leads to the reduction of free energy of the alloyed region. It exhibited better interconnection of the coated material and superior metallurgical bonding to the base material. Frictional heat produced during the wear test has promoted the formation of FeO, Cr2O3, CuO, NiO and Al2O3 oxide film on the PTA alloyed sample. These oxide films act as a barrier between two mating surfaces and improve the tribo performance of the PTA alloyed sample.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 409--420
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterisation of porous, calcium enriched coatings formed on Titanium via Plasma Electrolytic Oxidation
Autorzy:
Rokosz, Krzysztof
Hryniewicz, Tadeusz
Pietrzak, Kornel
Powiązania:
https://bibliotekanauki.pl/articles/1179160.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
85% orthophosphoric acid H3PO4
CP Titanium Grade 2
Micro Arc Oxidation (MAO)
Plasma Electrolytic Oxidation (PEO)
calcium nitrate tetrahydrate Ca(NO3)2∙4H2O
Opis:
The SEM and EDS study results of porous and calcium enriched coatings obtained via Plasma Electrolytic Oxidation (Micro Arc Oxidation) on the Commercial Purity Titanium Grade 2 samples, at three potentials 450 VDC, 550 VDC, 650 VDC in electrolytes containing 500 g Ca(NO3)2∙4H2O in 1000 mL H3PO4, are presented in the paper. In the same electrolyte three Titanium samples, one after other, were treated, with the PEO processing time equaling 3 minutes after each immersion. Based on SEM and EDS results, it was possible to state that all obtained coatings are porous and their calcium-to-phosphorus (Ca/P) ratio decreases with decreasing PEO voltage. In addition, it was found out that electrolyte aging results in decreasing Ca/P ratio, too.
Źródło:
World Scientific News; 2017, 83; 29-44
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface modifications of biomaterial with different cold plasma reactors to improve cell adhesion
Autorzy:
Terebun, Piotr
Kwiatkowski, Michał
Zarzeczny, Dawid
Pawłat, Joanna
Wójcik, Michał
Trzaskowska, Marta
Kazimierczak, Paulina
Przekora, Agata
Powiązania:
https://bibliotekanauki.pl/articles/2172008.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
curdlan
agarose
gliding arc discharge reactor
dielectric barrier discharge plasma jet
dielectric barrier discharge surface reactor
surface modification
Opis:
There is a growing trend in the engineering of biomaterials, focusing on surface modifications of biomaterials to improve their mechanical strength, corrosion resistance, and biological properties. Cold plasma treatment may improve biological properties of biomaterials for biomedical applications by enhancing their integration with host tissue. This study investigated the influence of different cold plasma treatments on the surface properties of a polysaccharides- -based biomaterial to improve cell adhesion to its surface. The samples were subjected to plasma treatment using three different reactors operating at atmospheric pressure: gliding arc discharge (GAD) reactor, dielectric barrier discharge (DBD) plasma jet, and DBD surface reactor. Next, surface chemistry of the biomaterial after plasma treatment was determined by ATR-FTIR analysis. Furthermore, a cell adhesion assay on the samples was carried out using normal human skin fibroblasts (BJ cell line). The attenuated total reflection Fourier transform infrared analysis (ATR- -FTIR) showed that new potential functional groups could be formed on the material surface after plasma treatment. However, plasma treatment of the samples did not enhance cell adhesion to the surface of the polysaccharides-based biomaterial. Thus, the obtained results indicate that plasma treatment using GAD reactor, DBD plasma jet, and DBD surface reactor was not effective for surface modification and cell responses.
Źródło:
Engineering of Biomaterials; 2022, 25, 165; 2--6
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of X5CrNi18-10 and S355NL steels after remelting with the electric arc
Autorzy:
Adamiak, S.
Powiązania:
https://bibliotekanauki.pl/articles/947417.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stal konstrukcyjna
przetapianie
warstwa powierzchniowa
plazma
łuk elektryczny
badanie strukturalne
construction steel
remelting
surface layer
plasma
electric arc
structure research
Opis:
The work presents the results of the research and tests of the surface machining of the S355NL and X5CrNi18-10 steels with the concentraded stream of heat with the usage of the GTAW method. The surface layers of the tested steels were remelted with the electric arc using the current of the electric arc 50, 100, 150 and 200A.The machining was done in the atmosphere of argon with the constant speed of the welding head. A microscope examination was performed of the obtained structure and measurements of depth, width and hardness of the received surface layer were performed. Moreover the relation between the current of the electric arc and geometry of the remelted layers with their microhardeness was examined.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 139-142
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and tribological properties of wear-resistant layers produced in process of plasma powder surfacing
Badanie struktury i własności tribologicznych napawanej plazmowo proszkowo warstwy trudnościeralnej
Autorzy:
Poloczek, Tomasz
Czupryński, Artur
Żuk, Marcin
Chruściel, Marek
Powiązania:
https://bibliotekanauki.pl/articles/115018.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
napawanie plazmowe
napawanie proszkowe
spawanie łukowe
PTA
zużycie ścierne
plasma welding
powder surfacing
arc welding
abrasive wear
Opis:
The following study presents the results of wear-resistant layer made of Ni-Cr-Si-B-Fe-C+WC alloy in the form of metallic powder on the AISI 4715 steel. Hardness and abrasion resistance tests were performed in accordance to PN-EN ISO 6508-1:2016 and ASTM G65-00 standards. Obtained data were compared to the abrasion resistant steel produced by Swedish manufacturer. Microscopic observations were made to determine the structure of obtained layer and base material using Olympus SZX9 stereoscopic light microscope. In order to determine the chemical composition of microregions, X-ray microanalysis researches were carried out.
W artykule przedstawiono wyniki badań dotyczące napawanej ręcznie plazmowo warstwy trudnościeralnej wykonanej stopem Ni-Cr-Si-B-Fe-C+WC w postaci proszku metalicznego na podłożu stali AISI 4715. Przeprowadzono pomiary twardości warstwy zgodnie z PN-EN ISO 6508-1:2016 oraz odporności na zużycie ścierne wg ASTM G65-00 porównując uzyskane dane z wynikami uzyskanymi dla trudnościeralnej blachy szwedzkiego producenta. Wykonano obserwacje metalograficzne mikroskopowe badanej warstwy oraz materiału podłoża przy wykorzystaniu stereoskopowego mikroskopu świetlnego Olympus SZX9. W celu określenia jakościowego i ilościowego składu chemicznego mikroobszarów napoiny przeprowadzono badania metodą mikroanalizy rentgenowskiej.
Źródło:
Welding Technology Review; 2019, 91, 5; 35-41
0033-2364
2449-7959
Pojawia się w:
Welding Technology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural investigation of the Plasma Transferred Arc hardfaced glass mold after operation
Badania strukturalne napoiny plazmowej formy szklarskiej po okresie eksploatacji
Autorzy:
Skowrońska, Beata
Sokołowski, Wojciech
Rostamian, Reyhaneh
Powiązania:
https://bibliotekanauki.pl/articles/115047.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
napawanie plazmowe
forma szklarska
PTA
plasma transferred arc
hardfacing
glass mold
Opis:
The paper presents the results of research aimed at detecting the causes of premature wear of molds for glass shaping, manifesting the formation of pits in the Plasma Transferred Arc pad-welds in which the working surface of the mold was shaped. The weld microstructure was tested, the chemical composition was determined in the pad-weld’s cross-section, linear and surface chemical distributions were made in the pad-weld’s cross-section, the surface morphology in damaged areas, and the chemical composition of surface inclusions were examined. The too high temperature of formed glass associated with wettability of the glass of the mold was indicated as the primary cause of premature mold wear.
W artykule przedstawiono wyniki badań ukierunkowanych na wykrycie przyczyn przedwczesnego zużycia form do kształtowania szkła, objawiające się powstawaniem wżerów w napoinie plazmowej, w której ukształtowano powierzchnię roboczą formy. Przeprowadzono badania mikrostruktury napoiny, określono skład chemiczny w przekroju napoiny, wykonano liniowe i powierzchniowe rozkłady pierwiastków chemicznych w przekroju napoiny, zbadano morfologię powierzchni w obszarach uszkodzonych, zbadano skład chemiczny wtrąceń na powierzchni. Jako podstawową przyczynę przedwczesnego zużycia form wskazano zbyt wysoką temperaturę formowanego szkła powiązaną ze zwilżalnością szkłem formy.
Źródło:
Welding Technology Review; 2020, 92, 3; 55-65
0033-2364
2449-7959
Pojawia się w:
Welding Technology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SEM and EDS studies of selected porous coatings obtained on titanium by Plasma Electrolytic Oxidation
Autorzy:
Rokosz, Krzysztof
Hryniewicz, Tadeusz
Pietrzak, Kornel
Dudek, Łukasz
Malorny, Winfried
Powiązania:
https://bibliotekanauki.pl/articles/1178480.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CP Titanium Grade 2
Micro Arc Oxidation (MAO)
Plasma Electrolytic Oxidation (PEO)
calcium nitrate Ca(NO3)2∙4H2O
copper nitrate Cu(NO3)2∙3H2O
magnesium nitrate Mg(NO3)2∙6H2O
Opis:
In present work, SEM and EDS results of porous and enriched in calcium, copper, magnesium and phosphorus coatings, which were obtained during 3-minute treatments of Plasma Electrolytic Oxidation PEO (Micro Arc Oxidation MAO) processes on CP Titanium Grade 2 at two potentials, i.e. 500 VDC and 650 VDC, are presented. It was found that the voltage of that process influences the chemical composition of coatings shapes obtained on titanium in electrolytes containing calcium, copper and magnesium nitrates. The pores shapes of PEO coatings formed on titanium in electrolytes containing calcium, copper and magnesium nitrates are presented, too. In addition, it was also noted that with using of higher voltage (here 650 VDC) of PEO treatments, the higher Ca/P, Cu/P and Mg/P ratios were found than those after treatments at 500 VDC.
Źródło:
World Scientific News; 2017, 70, 2; 71-85
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SEM and EDS studies of porous coatings enriched in calcium and zinc obtained by PEO with ramp voltage
Autorzy:
Rokosz, Krzysztof
Hryniewicz, Tadeusz
Pietrzak, Kornel
Powiązania:
https://bibliotekanauki.pl/articles/1178366.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CP Titanium Grade 2
Micro Arc Oxidation (MAO)
Plasma Electrolytic Oxidation (PEO)
calcium nitrate Ca(NO3)2∙4H2O
linear polarization
ramp voltage
zinc nitrate Zn(NO3)2∙6H2O
Opis:
In this work, the SEM and EDS results of porous and enriched in calcium or zinc coatings, which were obtained during 3-minute treatments using Plasma Electrolytic Oxidation (Micro Arc Oxidation) processes on CP Titanium Grade 2 at ramp potentials (linear polarization) from 0 up to 650 VDC in electrolytes containing 500 g Ca(NO3)2∙4H2O and/or 500 g Zn(NO3)2∙6H2O in 1 L H3PO4, are presented. It was found that obtained coatings have pores with different shapes and diameters. The Ca/P and Zn/P ratios by atomic concentration are the same and equal to 0.2, what may suggest hydroxyapatite-like structure (M,Ti)x(PO4)y, where M = {Ca, Zn}.
Źródło:
World Scientific News; 2017, 77, 2; 242-255
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SEM and EDS analysis of enriched in phosphorus and copper coatings fabricated by AC-PEO treatment
Autorzy:
Rokosz, Krzysztof
Hryniewicz, Tadeusz
Pietrzak, Kornel
Dudek, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/1178082.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CP Titanium Grade 2
Micro Arc Oxidation (MAO)
Plasma Electrolytic Oxidation (PEO)
copper nitrate Cu(NO3)2∙3H2O
Opis:
In the present paper, SEM and EDS studies of coatings obtained on CP Titanium Grade 2 under sinusoidal alternating voltage (AC) with frequency 50 Hz in Plasma Electrolytic Oxidation (PEO) process at voltages of 200 Vpp, 250 Vpp and 300 Vpp during 3-minute treatments, are displayed. Based on SEM micrographs it may be stated that the porous surfaces, which are needed for biomedical and catalysis application, are obtained only for samples fabricated at 200 Vpp. It was found out that thickest and most morphologically developed surfaces were obtained at 200 Vpp, too. The surfaces obtained at 250 Vpp and 300 Vpp are cracked and had low concentration of copper, i.e. 0.9 at% and 1.1 at%, respectively, while that one obtained at 200 Vpp was porous and had 8.6 at% copper.
Źródło:
World Scientific News; 2018, 95; 246-259
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected plasma nitriding methods usable for the thermo-chemical treatment of aircraft parts
Autorzy:
Grzesiak, G.
Zahorski, T.
Stypniak, M.
Walkowicz, J.
Jurczyszyn, R.
Powiązania:
https://bibliotekanauki.pl/articles/244738.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
plasma nitriding
aircraft part
Direct Current Plasma Nitriding
Low Pressure Nitriding in AEGD plasma
Low Pressure Nitriding in Arc Enhanced Glow Discharge plasma
active screen plasma nitriding
Opis:
The aim of the work was to review selected methods of plasma nitriding, which according to the authors might he used in the thermo-chemical treatment of aircraft parts. The introduction explains the nitriding process and presents the requirements on the thermo-chemical treatment of aircraft parts. Three methods of plasma nitriding have been described: Direct Current Plasma Nitriding (DCPN), Active Screen Plasma Nitriding (ASPN) and Low Pressure Nitriding in AEGD (Arc Enhanced Glow Discharge) plasma. While describing DCPN plasma nitriding method, authors drew attention to known problems, which occur in this process such as edge effect or hollow cathode effect. The Keller's model, the Marchand's model and the Walkowicz's model of nitriding process, which can be found in the literature, were also presented in this work. Another purpose of this work was to present hypotheses about the transportation of nitrogen during Active Screen Plasma Nitriding process and to show that in this nitriding method, defects typical for Direct Current Plasma Nitriding do not occur. While describing Low Pressure Nitriding in AEGD plasma, authors also presented the model of nitriding mechanism in this process, which shows four nitrogen diffusion paths (physisorption, chemisorption, adsorption ofNj, ion implantation). Examples of layers obtained by applying described nitriding methods were presented. The measurement ofnitrided layers confirmed that it is possible to obtain a layer without E film on the surface.
Źródło:
Journal of KONES; 2014, 21, 4; 145-152
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety and intelligent control system for plasmatron application
Autorzy:
Szałatkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/243581.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
safety
intelligent control
systems
automation
plasmatron
arc
control
plasma
Opis:
This article presents safety and intelligent control systems essential for safe and reliable operation of DC arc plasmatron. Presented methods and techniques are also applicable to other types of plasmatrons and devices. Author presents and describes subsystems of DC arc plasmatrons including its: start up and operation algorithms, detection of malfunction’s, control parameters and techniques for plasmatron operation. Moreover, issues and requirements identified in field operation are presented in case of plasmatron operation on site, communication and supervisory system for flexible integration of independent device in complex SCADA systems. Presented material covers also safety techniques, procedures and subsystems necessary for safe and reliable plasmatron operation, with examples of experience in plasmatrons applications. Presented in this article plasmatrons control and safety systems with theirs functions together with operation algorithms were applied and validated in constructed and operated plasmatrons. Plasmatrons were tested in different environments. For example in the plasmatron plasma reactor where three 20 kW plasmatrons were used and installed directly in high temperature refractory that consisted of plasma incineration and smelting of metals chamber.
Źródło:
Journal of KONES; 2017, 24, 2; 247-252
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on 16Mo3 steel pipe overlaid with superalloys Inconel 625 using robotized PPTAW
Badania rury ze stali 16Mo3 napawanej na stanowisku zrobotyzowanym metodą PPTAW nadstopem niklu Inconel 625
Autorzy:
Czupryński, Artur
Powiązania:
https://bibliotekanauki.pl/articles/115063.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
okładzina plazmowa
inconel 625
stal 16Mo3
spawanie łukowe
PPTAW
plasma cladding
16Mo3 steel
plasma powder transferred arc welding
Opis:
The article presents research on the development of technology and mechanical properties of a 16Mo3 steel tube overlaid with Inconel 625 nickel superalloy using robotized Plasma Powder Transferred Arc Welding (PPTAW) process. Based on the results of non-destructive, metallographic and microscopic observations, chemical composition, thickness and hardness measurements of overlays optimal technological parameters for working in elevated temperature environment were selected. The performed test has shown the correct structure of the overlay weld without welding imperfections. The examined padding weld was characterized by a dendritic structure with primary crystals growing in the direction of heat removal. It has been stated that in the range of heat input to base material 277÷514 J/mm, the iron content in the surface zone of 1,5 mm padding weld ranges from 4 to 5,5%.
W artykule przedstawiono wyniki badań dotyczących opracowania technologii napawania i właściwości mechanicznych rury ze stali kotłowej gatunku 16Mo3 pokrytej zewnętrzną warstwą plateru z nadstopu niklu Inconel 625 nanoszonego w procesie zrobotyzowanego napawania plazmowego proszkowego (PPTAW). W oparciu o wyniki badań nieniszczących, metalograficznych makro- imikroskopowych, składu chemicznego oraz pomiarów grubości i twardości warstwy plateru, wytypowano optymalne parametry technologiczne wykonywania tego typu zabezpieczeń na elementach rurowych konstrukcji energetycznych pracujących w podwyższonej temperaturze. Przeprowadzone badania wykazały prawidłową budowę warstwy plateru bez niezgodności spawalniczych. Badana warstwa charakteryzowała się budową dendrytyczną o kryształach pierwotnych narastających w kierunku odprowadzania ciepła. Wykazano, że przy ilości ciepła wprowadzonego do materiału rodzimego z zakresu 277÷514 J/mm, zawartość żelaza w strefie przypowierzchniowej plateru o grubości ok. 1,5 mm mieściła się w przedziale od 4 do 5,5%.
Źródło:
Welding Technology Review; 2019, 91, 11; 9-16
0033-2364
2449-7959
Pojawia się w:
Welding Technology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of Nano Aluminium Powder (NAP) using a Thermal Plasma: Process Development and Characterization
Autorzy:
Pant, A.
Seth, T.
Raut, V. B.
Gajbhiye, V. P.
Newale, S. P.
Nandi, A. K.
Prasanth, H.
Pandey, R. K.
Powiązania:
https://bibliotekanauki.pl/articles/358835.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
nano aluminium
thermal plasma
DC arc plasma
RF induction plasma
aluminium content
BET surface area
HR-TEM
Opis:
A bottom up approach for the preparation of Nano Aluminium Powder (NAP) using a Transferred Arc Thermal Plasma Reactor (TAPR) is described. The aluminium block is subjected to evaporation by the application of a thermal plasma. The aluminium vapour produced is rapidly quenched to room temperature resulting in crystallization of the aluminium vapour in nano-particulate form. Various process parameters, such as the plasma torch power, reactor pressure and plasma gas composition were optimized. This paper also describes the characterization of NAP by analytical methods, for the estimation of the Active Aluminium Content (AAC), Total Aluminium Content (TAC), XRD, bulk density, BET surface area, HR-TEM etc. The results are compared with those for samples prepared in other thermal plasma reactors, such as the DC Arc Plasma Reactor (DCAPR) and the RF Induction Thermal Plasma Reactor (RFITPR), and for commercially available NAP samples (ALEX, prepared by the EEW technique).
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 1; 53-71
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porous PEO coatings on titanium, obtained under DC regime, enriched in magnesium, calcium, zinc, and copper
Autorzy:
Rokosz, Krzysztof
Hryniewicz, Tadeusz
Pietrzak, Kornel
Dudek, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/1156239.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
plasma electrolytic oxidation (peo)
micro arc oxidation (mao)
cp titanium grade 2
calcium nitrate ca(no3)2•4h2o
magnesium nitrate mg(no3)2∙6h2o
zinc nitrate zn(no3)2∙6h2o
copper nitrate cu(no3)2∙3h2o
Opis:
In the present paper, the analysis of SEM and EDS results of porous and enriched in calcium, magnesium, zinc, copper and phosphorus coatings, obtained during 3-minute treatments performed by Plasma Electrolytic Oxidation (PEO)/Micro Arc Oxidation (MAO) processes on CP Titanium Grade 2, is presented. The PEO process was carried out at DC potentials of 500 VDC, 575 VDC, and 650 VDC in electrolytes containing 125 g Ca(NO3)2•4H2O, and 125 g Mg(NO3)2∙6H2O, and 125 g Zn(NO3)2∙6H2O, and 125 g Cu(NO3)2∙3H2O in 1 L H3PO4. It was found that obtained coatings have pores with different shapes and diameters and/or size/dimentions. The Ca/P, Mg/P, Zn/P, Cu/P, and M/P ratios (M=Ca+Mg+Zn+Cu) were equal to 0.074, 0.046, 0.056, 0.042, and 0.218, respectively. The highest value of each of these ratios was recorded for 650 VDC. It may be concluded that the obtained PEO coatings structures most likely are similar to hydroxyapatite-like structures, in which the Ca2+ may be replaced with Zn2+, Mg2+, Cu2+.
Źródło:
World Scientific News; 2018, 94, 2; 99-114
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 32

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