Zobrazeno 1 - 10
of 54
pro vyhledávání: '"Gerd Sepold"'
Publikováno v:
Welding in the World. 53:58-66
Industrial solutions for joining of similar and, most recently, of dissimilar materials are increasingly based on hybrid laser-arc welding processes. To increase the understanding of the synergistic effects of such hybrid processes, it is necessary t
Autor:
Knut Partes, Gerd Sepold
Publikováno v:
Journal of Materials Processing Technology. 195:27-33
Laser cladding is a technique with many advantages compared to alternative processes like overlay welding and thermal spraying. However laser cladding is not widely applied in industry. The low efficiency of the laser power exploitation and the compa
Autor:
Carsten Wochnowski, Koji Sugioka, Yasutaka Hanada, Ya Cheng, K. Meteva, Gerd Sepold, Frank Vollertsen, K. Midorikawa
Publikováno v:
Journal of Laser Micro/Nanoengineering. 1:195-200
In this paper first experimental results are presented on the fabrication of integrated-optical microstructures by femtosecond-laser irradiation at the surface or in the volume of a polymeric substrate. Thereby the refractive index or the optical abs
Publikováno v:
Journal of Materials Processing Technology. 149:536-540
In this treatment method laser radiation, which is guided from a co-axially expanding liquid jet-stream, locally initiates on a metal surface a thermochemical etching reaction, which leads to selective material removal. Time-resolved measurements of
Publikováno v:
Diamond and Related Materials. 11:472-477
In this paper the development of a new plasma-CVD method for synthesis of PC-diamond coatings in air is presented. The method does not require any vacuum or reaction chamber and is based on plasma-CVD processes taking place in a photon-initiated stat
Autor:
Vitali I. Konov, S. Metev, Gerd Sepold, H. Brecht, V.G. Pereverzev, V. G. Ralchenko, A. S. Pozharov
Publikováno v:
Diamond and Related Materials. 9:373-377
The efficiency of a polycrystalline diamond coating in a DC arc-jet setup with a power of 5–10 kW was enhanced by extension of a high temperature jet core. Two approaches were investigated. First, an expansion of the plasma jet anode channel was em
Publikováno v:
Diamond and Related Materials. 8:1677-1681
Simultaneous UV-laser irradiation during the deposition of DLC films has been found to significantly influence the growth process and to favourably modify the film properties. The influence of the spectral and energetic parameters of laser radiation
Autor:
S.A. Uglov, A M Prokhorov, Birgit Angstenberger, Andrey Bolshakov, Friedrich Dausinger, S. Metev, Helmut Hügel, Vitaly I. Konov, I. A. Leontiev, Gerd Sepold
Publikováno v:
Applied Physics A: Materials Science & Processing. 66:575-578
laser maintenance of a stationary optical discharge in a gas stream, exhausting over a substrate into the air (laser plasmatron). Nano- and polycrystalline-diamond films were deposited on tungsten substrates from atmospheric-pressure Xe(Ar):H2:CH4 ga
Publikováno v:
Sensors and Actuators A: Physical. 51:41-45
Laser-induced wet chemical etching of titanium and stainless steel foils in phosphoric and sulphuric acid was investigated. Focussing of cw-Nd:YAG laser radiation at power levels up to 7 W to a focal spot diameter of about 25 μm resulted in chemical
Autor:
A.A. Smolin, V. G. Ralchenko, E.N. Loubnin, S.M. Metev, Vitali I. Konov, Elena D. Obraztsova, Gerd Sepold, Sergej M. Pimenov
Publikováno v:
Diamond and Related Materials. 4:1073-1078
We report on chemical vapour deposition growth of nanocrystalline (grain size 30–50 nm) diamond films of 100 nm to 2 μm thickness in methane-rich mixtures. A d.c. arc discharge in CH4H2Ar gas mixtures with a methane percentage CH4(CH4 + H2)