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Optical Investigation of Plasma Formation Process by Interaction of Intense Electron Beams with Metallic Targets

100%
An W., Engelko V., Mueller G., Weisenburger A.
Acta Physica Polonica A
|
2009
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vol. 115
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issue 6
1183-1185
EN
Electron beams with energies ≥ 100 keV offer attractive possibilities to modify metallic surfaces. Numerous experiments with the electron accelerators GESA I and II showed excellent results regarding the improvement of mechanical properties and the enhancement of the corrosion resistance of the treated materials. The next step leads to further technological adaptation of the process that especially was focused on the adaptation of the electron beam to the surface geometry. For the treatment of the outer surface of tubes the electron beam facility GESA IV with a radial converged electron beam was designed. In first experiments unexpected electrical short-circuiting after different time periods occurred. Two major reasons could be identified: excessive plasma formation at the cathode and target plasma formation. The latter can be controlled by vacuum conditions and surface cleaning of the target, the first by controlling the duration of plasma formation at the cathode.
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Intense Pulsed Electron Beams Application οf Modified Materials

64%
Weisenburger A., An W., Engelko V., Heinzel A., Jianu A., Lang F., Mueller G., Zimmermann F.
Acta Physica Polonica A
|
2009
|
vol. 115
|
issue 6
1053-1055
EN
Intense pulsed electron beams have been applied for surface modification of materials in our laboratory for several years. An improvement of properties like wear, corrosion and oxidation resistance was found. Three different modification modes can be distinguished: rapid melting and solidification, surface alloying of coatings into the bulk and surface fusing of coatings to the bulk. All three surface treatment processes were investigated using the GESA (Gepulste Elektronen Strahl Anlage) facilities having following parameters: accelerating voltage 80-400 kV; power-density 2-6 MW/cm^{2}; beam diameter 4-10 cm; pulse duration 4-250 μs. Such pulses applied on material surfaces lead to a change in microstructure and in the case of surface alloying also to a change in chemical composition. This paper will give an overview on applications in different fields of surface modified materials.
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