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Tytuł:
Capabilities of Thomson parabola spectrometer in various laser-plasma- and laser-fusion-related experiments
Autorzy:
Tchórz, Przemysław
Szymański, Maciej
Rosiński, Marcin
Chodukowski, Tomasz
Borodziuk, Stefan
Powiązania:
https://bibliotekanauki.pl/articles/2202568.pdf
Data publikacji:
2023
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
acceleration
diagnostic
ion
laser
plasma
Thomson spectrometer
Opis:
The Thomson parabola spectrometer (TPS) [1] is a well-known, universal diagnostic tool that is widely used in laser plasma experiments to measure the parameters of accelerated ions. In contrast to other popular ion diagnostics, such as semiconductor detectors or ion collectors, the TPS is not greatly affected by electromagnetic pulses generated during high-power laser interaction with matter and can be tuned to acquire data in various energy ranges of accelerated ions, depending on the goal of the experiment. Despite the many advantages of this diagnostic device, processing the collected data is a diffi cult task and requires a lot of caution during interpretation of gathered results. In this work, we introduce the basic principles of operation and data analysis based on the numerical tool created specifi cally for the TPS designed at the Institute of Plasma Physics and Laser Microfusion, present a range of data obtained during various recent experiments in which our TPS was used, and highlight the diffi culties in data analysis depending on the purpose of the experiment and the experimental setup.
Źródło:
Nukleonika; 2023, 68, 1; 29--36
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of plasma expansion plumes in view of pulses laser irradiating centimeter-scale spherical space debris
Autorzy:
Fang, Yingwu
Powiązania:
https://bibliotekanauki.pl/articles/27310108.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
plasma expansion plume
pulse laser
centimeter-scale spherical space debris
dynamic model
Opis:
The objective of this article was to investigate the dynamic evolution behaviors of plasma expansion plumes by pulses laser irradiating centimeter-scale spherical space debris. A calculated model of centimeter-scale spherical space debris irradiated by pulses laser was firstly deduced based on FEM (finite element method)/COMSOL, and the action rules of plasma expansion plumes by pulses laser-generated irradiating the debris were simulated for different laser powers and action times. The results showed that the velocity of plasma expansion plumes was increased with the increase of laser powers and action times. Especially, when the laser power was 700 kW and the action time was close to 25 μs, the maximum velocity of plasma expansion plumes approached 1.91 km/s, and the diffusion radius of plasma expansion plumes was increased by about 2.5 mm. Further, the diffusion radius was about twice that of 400 kW when the action time reached about 48 μs. As a result, by simulating the transient flow process of nanosecond pulses laser irradiating small spherical space debris, the flow field evolution information and plasma plumes evolution characteristics of centimeter-scale space debris at nanosecond time resolution were revealed.
Źródło:
Optica Applicata; 2023, 53, 3; 363--375
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of low-temperature plasmas formed in low-density gases surrounding laser-produced plasmas
Autorzy:
Majszyk, Mateusz
Bartnik, Andrzej
Skrzeczanowski, Wojciech
Fok, Tomasz
Węgrzyński, Łukasz
Szczurek, Mirosław
Fiedorowicz, Henryk
Powiązania:
https://bibliotekanauki.pl/articles/2202566.pdf
Data publikacji:
2023
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
extreme ultraviolet
EUV
laser plasma
low pressure
photoionization
plasma
soft X-ray
SXR
Opis:
Low-temperature plasma production is possible as a result of photoionization using high-intensity extreme ultraviolet (EUV) and soft X-ray (SXR) pulses. Plasma of this type is also present in outer space, e.g., aurora borealis. It also occurs when high-velocity objects enter the atmosphere, during which period high temperatures can be produced locally by friction. Low-temperature plasma is also formed in an ambient gas surrounding the hot laser-produced plasma (LPP). In this work, a special system has been prepared for investigation of this type of plasma. The LPP was created inside a chamber fi lled with a gas under a low pressure, of the order of 1–50 mbar, by a laser pulse (3–9 J, 1–8 ns) focused onto a gas puff target. In such a case, the SXR/EUV radiation emitted from the LPP was partially absorbed in the low-density gas. In this case, high- and low-temperature plasmas (Te ~100 eV and ~1 eV, respectively) were created locally in the chamber. Investigation of the EUV-induced plasmas was performed mainly using spectral methods in ultraviolet/visible (UV/VIS) light. The measurements were performed using an echelle spectrometer, and additionally, spatial–temporal measurements were performed using an optical streak camera. Spectral analysis was supported by the PGOPHER numerical code.
Źródło:
Nukleonika; 2023, 68, 1; 11--17
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controlling the plasma electron number density of copper metal using NIR picosecond laser-induced plasma spectroscopy
Autorzy:
Fikry, Mohamed
Tawfik, Walid
Omar, Magdy
Powiązania:
https://bibliotekanauki.pl/articles/2033963.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
picosecond
LIPS
laser induced plasma spectroscopy
copper
electron density
Stark broadening
Opis:
In this paper, we investigate a new method to control the plasma electron number density of copper metal using a near-infrared (NIR) picosecond Nd:YAG laser-induced plasma spectroscopy (LIPS) technique. The applied laser parameters are as follows; laser pulse energy and intensity varied from 29.2 to 59.4 mJ ± 3% and from 6.01×1010 to 12.35×1010 W/cm2 ± 5%, respectively, for a single pulse at 170 ps pulse duration, and beam diameter about 0.5 ± 0.1 mm. By considering the Stark broadening of a specific spectral line, electron density can be calculated using a neutral copper line at 521.8 nm, assuming the local thermodynamic equilibrium (LTE) condition. The observed electron density values were 1.09×1016, 2.24×1016, 3.60×1016, and 4.75×1016 cm–3 for the laser pulse energies 29.2, 41, 52.4, and 59.4 mJ, respectively. The plasma electron density values are increased with the increase in laser pulse energy. Such findings were interpreted due to an increase in the mass ablation rates with laser pulse energy. The obtained results explore the ability to control the plasma electron density by controlling the picosecond pulse energy. These results can contribute to the development of plasma technologies and their applications in many fields.
Źródło:
Optica Applicata; 2021, 51, 3; 365-374
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental assessment of changes in structural steel composition by progressive technology cutting
Autorzy:
Mascenik, Jozef
Powiązania:
https://bibliotekanauki.pl/articles/2037386.pdf
Data publikacji:
2021
Wydawca:
STE GROUP
Tematy:
laser
plasma
water jet
cutting
structure
microhardness
Opis:
The submitted paper deals with the issue of change in structure, hardness and thermally affected zone of the samples of a toothed wheel part produced by technology of cutting by plasma, laser and water jet. The cutting process by laser and plasma technology causes intensive thermal affection of material and change in structure and microhardness in the cutting area referred to as thermally affected zone. The paper describes three material cutting technologies of the toothed wheel part. The experimental part contains description of experimental sample preparation, its hardness measurement and examination of structure along with further evaluation through graphs and photo documentation of structures.
Źródło:
Management Systems in Production Engineering; 2021, 4 (29); 266-273
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pulsed laser induced potassium oxide plasma analyzed by optical emission spectrum technique
Autorzy:
Khalaf, Madyan A.
Powiązania:
https://bibliotekanauki.pl/articles/1193329.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Laser - Induced Plasma (LIP)
Nd:YAG laser
Optical Emission Spectroscopic
potassium oxide plasma
Opis:
In this work, a spectroscopic research on laser-produced potassium oxide plasma using optical emission spectroscopy (OES) technology is provided. Laser-induced K2O plasma produced at various laser energy has also been defined by visible emission spectroscopy. Plasma is created by a solid potassium oxide object radiated by a pulsed laser in a room environment. A Nd:YAG laser pulse 9 ns in duration with wavelength of (532) nm and a focal length of (10) cm in the range of energy (300-700) mJ is used to generate plasma from a planar K2O sample. The electron temperature (Te) was calculated in ratio line intensities method, while the electron density (ne) was calculated using Saha-Boltzmann equation, also another plasma parameters was calculated such as plasma (fp), Debye length (λD) and Debye number (ND). The increase in electron temperature and density was observed as a function of laser energies. Measurement of the production of the electron temperature in the rang (0.996-1.202) eV, While the electron density is in the rang (1.8×1016-8.8×1016) cm-3.
Źródło:
World Scientific News; 2021, 153, 2; 192-204
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verify the plasma parameters generated from the Tin material using the laser-induced plasma technique
Autorzy:
Ahmed, Baida M.
Aadim, Kadhim A.
Khalaf, Madyan A.
Powiązania:
https://bibliotekanauki.pl/articles/1030607.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Laser-Induced Plasma (LIP)
Nd:YAG laser
Optical Emission Spectroscopic (OES)
Tin (Sn)
Opis:
In this work, A spectroscopic research on laser-produced tin plasma using optical emission spectroscopy (OES) technology is provided. Laser-induced Sn plasma produced at various laser energy has also been defined by visible emission spectroscopy. Plasma is created by a solid tin object radiated by a pulsed laser in a room environment. A Nd:YAG laser pulse 9 ns in duration with wavelength of 1064 nm and a focal length of 10 cm in the range of energy 500-800 mJ is used to generate plasma from a planar Sn sample. The electron temperature (Te) was calculated in ratio line intensities method, while the electron density (ne) was calculated using Saha-Boltzmann equation, also another plasma parameters was calculated such as plasma (fp), Debye length (λD) and Debye number (ND). The increase in electron temperature and density was observed as a function of laser energies. Measurement of the production of the electron temperature in the rang 0.926-0.952 eV, While the electron density is in the rang (1.9×1015-2.5×1015) cm-3.
Źródło:
World Scientific News; 2020, 144; 326-337
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ARIES 2018 : infrastructure, innovation, outreach
Autorzy:
Romaniuk, Ryszard S.
Powiązania:
https://bibliotekanauki.pl/articles/226770.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
particle accelerators
accelerator science and technology
novel accelerators
high field magnets
superconducting magnets
RF particle guns
particle detectors
high energy physics
applications of particle accelerators
laser and plasma accelerators
community and social implications of ARIES
EC Integrating Introduction
Opis:
This article has two outreach aims. It concisely summarizes the main research and technical efforts in the EC H2020 ARIES Integrating Activity – Accelerator Research and Innovation for European Science and Society [1] during the period 2017/2018. ARIES is a continuation of CARE, TIARA and EuCARD projects [2-3]. The article also tries to show these results as an encouragement for local physics and engineering, research and technical communities to participate actively in such important European projects. According to the author’s opinion this participation may be much bigger [4-27]. All the needed components to participate – human, material and infrastructural are there [4,7]. So why the results are not satisfying as they should be? The major research subjects of ARIES are: new methods of particles acceleration including laser, plasma and particle beam interactions, new materials and accelerator components, building new generations of accelerators, energy efficiency and management of large accelerator systems, innovative superconducting magnets, high field and ultra-high gradient magnets, cost lowering, system miniaturization, promotion of innovation originating from accelerator research, industrial applications, and societal implications. Two institutions from Poland participate in ARIES – these are Warsaw University of Technology and Institute of Nuclear Chemistry and Technology in Warsaw. There are not present some of the key institutes active in accelerator technology in Poland. Let this article be a small contribution why Poland, a country of such big research potential, contributes so modestly to the European accelerator infrastructural projects? The article bases on public and internal documents of ARIES project, including the EU Grant Agreement and P1 report. The views presented in the paper are only by the author and not necessarily by the ARIES.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 1; 119-124
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Supertwarde warstwy W-B i W-Ti-B osadzane z tarcz spiekanych metodą SPS
Super-hard films W-B and W-Ti-B deposited from targets sintered by SPS method
Autorzy:
Psiuk, Rafał
Słomińska, Hanna
Hoffman, Jacek
Mościcki, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/211903.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
Tematy:
ablacja laserowa
borki wolframu domieszkowane tytanem
spiekanie plazmowe
laser ablation
tungsten borides doped titanium
plasma sintering
Opis:
Z rosnącym zapotrzebowaniem na niezawodne, a jednocześnie zapewniające dużą wydajność, narzędzia do skrawania i obróbki plastycznej, coraz większego znaczenia nabiera rozszerzająca się grupa supertwardych ceramik przewodzących prąd. Mate-riały te dobrze rokują w związku z rozwiązaniem problemów tradycyjnych materiałów narzędziowych, których niedoskonałości obejmują wysoką cenę (azotek krzemu, azotek boru), niezdolność do cięcia stopów żelaza w wyniku reakcji chemicznych (diament), niestabilność w obecności wilgoci (azotek boru) i względnie małą twardość (węglik wolframu). Również rosnący popyt na powłoki ochronne o wysokiej twardości, o dob-rych właściwościach sprężystych i stabilności termicznej powoduje, że badania nad nowymi systemami materiałowymi prowadzone są coraz intensywniej. Pomimo że azotki metali przejściowych są już z powodzeniem stosowane do różnych zadań w prze-myśle samochodowym i lotniczym, poszukiwanie ulepszonych materiałów jest tematem wciąż aktualnym. W pracy przedstawiono badania nad osadzaniem cienkich powłok z nowych supertwardych materiałów (SHM), którymi są borki wolframu. Dodatkowo zbadano wpływ domieszkowania tych materiałów tytanem. Warstwy osadzane były metodą ablacji laserowej PLD. Tarcze do osadzania zsyntetyzowane zostały metodą spiekania plazmowego SPS proszków boru i wolframu o stosunku atomów 4,5 do 1. Osadzane z użyciem lasera warstwy mają skład stechiometryczny podobny do użytych tarcz. W warstwach tych dominuje faza WB3. Badania przeprowadzone z użyciem SEM, XRD i nanoindentacji wykazały, że skład fazowy tarcz jest odwzorowany w war-stwach osadzonych laserem. Wszystkie uzyskane warstwy są bardzo twarde i stabilne termicznie. Warstwy osadzane laserem odznaczają się dużą chropowatością. Domiesz-kowanie tytanem zwiększa ilość fazy WB3 w spiekanych tarczach i osadzanych war-stwach oraz zmniejsza ilość i wielkość naniesionych na powierzchnię cząstek.
With increasing demand for high-performance and long-lasting cutting and forming tools, the members of this expanding class of superhard metals hold promise to address the shortcomings of traditional tool materials. Those shortcoming include their high cost (silicon nitride, cubic boron nitride, and diamond), their inability to cut ferrous metals due to chemical reactions (diamond), instability in the presence of humidity (cubic boron nitride) and relatively low hardness (tungsten carbide). Also the increasing industrial demand for protective coatings with high hardness, good elastic properties and thermal stability calls for the investigation of new material systems. Although transition metal (TM) nitrides are successfully applied for different tasks in automotive or aero-space industries, the search for improved materials is an ongoing topic, being far from its end. In this work the study on deposition of thin films made of new super-hard materials (SHM) such as tungsten boride are presented. Additionally, the influence of doping by titanium of those materials is investigated. Investigated films were deposited by the pul-sed laser deposition method. The used targets were synthetized by SPS method. The powders of boron and tungsten in 4.5 to 1 molar faction were used. The films deposited by PLD method have stoichiometric composition such as used targets. The WB2 and WB3 phase are dominant. Research carried out using SEM, XRD and nanoindentation test showed that the phase composition of the targets is more important in the case of laser deposition than magnetron. All obtained layers are very hard and thermally stable. In the case of magnetron sputtering, smooth layers were obtained while the layers depo-sited by the laser have a very high roughness. Titanium doping increases the amount of WB3 phase in the sintered discs, while it has no significant effect on the properties of the deposited layers.
Źródło:
Obróbka Plastyczna Metali; 2019, 30, 2; 107-120
0867-2628
Pojawia się w:
Obróbka Plastyczna Metali
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Factors Influencing Dry Sliding Wear Behaviour of Laser Remelted Plasma Sprayed Mo Coating Using Response Surface Methodology
Autorzy:
Manjunatha, S. S.
Manjaiah, M.
Basavarajappa, S.
Powiązania:
https://bibliotekanauki.pl/articles/356714.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser remelting
plasma spray
central composite design (CCD)
response surface methodology (RSM)
Mo coating
Opis:
Plasma spraying is a process widely used to fabricate wear resistant coatings. However, various problems are associated with plasma spraying out of which poor bonding strength between the coating and the substrate and the high porosity in the as sprayed coatings are of major concern. In order to eliminate these problems and enhance wear performance, the laser remelting process has been used. The laser remelting of plasma sprayed Mo coatings alters the wear mechanism and improves the wear resistance. The wear mechanism and wear volume loss depend on the applied load, sliding speed and sliding distance. Hence, an effort has been made to investigate the effect of process parameters on volume loss using Response Surface Methodology (RSM) based mathematical models. The experiments were planned as per Central Composite Design (CCD). The investigations revealed that the applied load was the most dominant factor affecting the volume loss of the coating. The sliding speed, sliding distance and interaction effects were considered as the next important parameters influencing the volume loss. The investigation also reveals that, the wear volume loss depends on two wear mechanisms, one being the formations of grooves along surface tribo films and other being fracture of splats with delamination of the coating.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 217-225
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the bonding strength of FE-based self-fluxing alloy coating deposited by different methods on the steel substrate
Autorzy:
Feldshtein, E.
Kardapolava, M.
Dyachenko, O.
Powiązania:
https://bibliotekanauki.pl/articles/266279.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
natryskiwanie plazmowe
siła wiązania
przetapianie laserem
Fe-based self-fluxing alloy
coating
plasma spraying
laser remelting
bonding strength
Opis:
In the present paper, the bonding strength of Fe-based self-fluxing alloy coating deposited by plasma spraying, gluing and laser remelting and alloying on the steel substrate have been investigated. When flame melting, a globular structure is formed. Against the background of the solid solution carbide-boride phases are clearly distinguishable, between which the Fe–Fe2B and Fe–FeB eutectic colonies are situated. Laser remelting leads to the formation of metastable structures, reinforced with dendrites, consisting of alloyed Fe-α and Fe-γ. At the low laser beam speeds the coating is melted completely with the formation of a cast structure with the dendrites. When the laser beam speed is increased, the dendritic structure gets fragmented. Structures of coatings alloyed with B4C and remelted by the laser beam vary with the increase of the spot speed. The bonding strength of coating without subsequent remelting decreases by 4–5 times in comparison with remelted. The bonding strength of the reinforced glue coating has adhesive and adhesive-cohesive character. When the load increases in the coating, microcracks develop, which gradually spread to the center of the bonding surface. For plasma coatings after laser remelting without additional alloying, the maximum bonding strength is observed with the minimum laser beam speed. With increasing the laser beam speed it decreases almost 1.5 times. In glue coatings reinforced with B4C particulates by laser remelting, the bonding strength is lower by 1.2–1.4 times in comparison with plasma coating.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 355-364
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Modification of Solids by Extreme Ultraviolet and Plasma Treatment
Autorzy:
Bartnik, A.
Fiedorowicz, H.
Skrzeczanowski, W.
Czwartos, J.
Wachulak, P.
Jarocki, R.
Kostecki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1030617.pdf
Data publikacji:
2018-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
laser plasma
photoionized plasma
surface treatment
nanostructures
Opis:
In this paper, results of surface modification, using a laser-produced plasma source of extreme ultraviolet, and the extreme ultraviolet induced low temperature plasmas, are presented. It was shown that irradiation of different materials by intense extreme ultraviolet pulses results in strong changes of the surface morphology. Examples of micro- and nanostructures obtained this way are presented. It was also demonstrated that a dual action of the radiation pulses and low temperature plasmas allows to modify a molecular structure of exposed materials.
Źródło:
Acta Physica Polonica A; 2018, 133, 2; 267-270
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Functional plasma-deposited coatings
Autorzy:
Pashechko, M.
Kindrachuk, M.
Gumeniuk, I.
Tisov, O.
Zahrebelniy, V.
Powiązania:
https://bibliotekanauki.pl/articles/957956.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
plasma deposition
coating
laser treatment
thermal cycling
mass transfer
adhesion
wear resistance
Opis:
The paper focuses on the problem of low adhesion of plasma sprayed coatings to the substrate. The subsequent laser treatment modes and their influence on the coating-substrate interface were studied. This allows to decrease the level of met-stability of the coating, thus decreasing its hardness down to 11–12 GPa on the surface and to about 9 GPa on depth of 400 μm. The redistribution of alloying elements through solid and liquid diffusion improves mechanical properties and rises the adhesion up to 450 MPa after remelting and up to 90–110 MPa after laser-aided thermal cycling. At the same time, remelting of coating helps to decrease its porosity down to 1%. The obtained complex of properties also allows to improve wear resistance of coatings and to decrease friction factor.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 301-304
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The characteristics of welded joints of stainless steel for air conditioning application
Charakterystyka połączeń spawanych ze stali odpornej na korozje w systemach klimatyzacji
Autorzy:
Węglowski, M. S.
Węglowska, A.
Kwieciński, K.
Dworak, J.
Rykała, J.
Ziobro, G.
Szafron, A.
Noga, P.
Richert, M.
Powiązania:
https://bibliotekanauki.pl/articles/176124.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
air-conditioning
laser welding
plasma microwelding
high speed friction welding
klimatyzacja
spawanie wiązką laserową
spawanie mikroplazmowe
zgrzewanie tarciowe szybkoobrotowe
Opis:
In the paper the results of metallographic examination of welded joints for car air-conditioning unit are presented. The European directives 2006/40/EC on the greenhouse gasses elimination demand to stop using traditional refrigerant and to change it to R744 medium in air conditioning installation. The R744 (CO2) refrigerant is environmental friendly medium if compared with standard solution such as R12, R134a or R1234yf and safer for passengers than R1234yf. The non-standard thermodynamic parameters of the R744 which translate into high pressure and high temperature require specific material to develop the shape and to specify the technology of manufacturing for the particular elements of the conduits and moreover the technologies of joining for the whole structure, which would meet the exploitation requirements of the new unit. To produce the test welded joints of stainless steels three different joining technologies were applied: laser welding, plasma welding as well as high speed friction welding. The results indicated that laser and plasma technologies guaranty the proper quality of welded joints and can be used for the air conditioning application in automotive industry.
W pracy przedstawiono analizę wyników badań mikroskopowych połączeń spawanych stosowanych w samochodowych systemach klimatyzacji. Europejska dyrektywa 2006/40/WE dotycząca gazów cieplarnianych wymaga ograniczenia dotychczas używanych tradycyjnych czynników chłodniczych. Zaleca stosowanie czynnika R744 w instalacjach klimatyzacji. Nowy czynnik chłodniczy R744 (CO2) jest mniej niebezpieczny dla środowiska i bezpieczniejszy dla pasażerów w porównaniu z tradycyjnymi, m.in.: R12, R134a lub R1234yf niż R1234yf. Niestandardowe parametry termodynamiczne eksploatacji czynnika R744 - duże ciśnienie i wysoka temperatura wymagają wprowadzenia nowych materiałów, zmiany konstrukcji samych systemów i opracowania technologii poszczególnych jej elementów - przewodów. Również opracowania technologii łączenia elementów instalacji całej konstrukcji, spełniającej wymagania eksploatacyjne nowego systemu klimatyzacji. Próbne połączenia spawane elementów ze stali nierdzewnej wykonano z zastosowaniem trzech technologii: spawanie laserowe i mikroplazmowe oraz zgrzewanie tarciowe. Analiza wyników prowadzonych badań wykazała, że technologie laserowe i mikroplazmowe gwarantują odpowiednią jakość połączeń spawanych. Mogą być stosowane w systemach klimatyzacji w przemyśle motoryzacyjnym.
Źródło:
Advances in Manufacturing Science and Technology; 2017, 41, 3; 25-33
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Zno Nano Material Interaction With Nd:YAG Laser Under Vacuum
Autorzy:
Hussam, N. Mohammed Ali
Yahya, Abdulkreem Salman
Powiązania:
https://bibliotekanauki.pl/articles/1179694.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Langmuir probe
Nd:YAG laser etching
Plasma generation
ZnO nanomaterial
electron density
electron temperature
Opis:
The goal of this paper is to study the Nd:YAG laser interaction with the ZnO nanomaterial by etching the ZnO nanodisc surface. The preparation of ZnO nanodisc is studied also and the setup which we use in previous experiment published in the (IJRRR, Vol. X, Issue 1, March 2017) is used also. The interaction is done under vacuum conditions with high pressure in the range of (10-3) Tor. The main target of the paper is to study the plasma generated from the etching of the ZnO nanodisc by Nd:YAG laser.
Źródło:
World Scientific News; 2017, 72; 248-255
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
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