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Vlastnosti částic dvoufázového prášku na bázi Fe-Al stříkaných metodou WSP
 Skiba, Tomáš ; Voleník, Karel ; Neufuss, Karel ; Mušálek, Radek ; Karlík, M.
Paper deals with properties of the in-flight state powder particles subjected to spraying via water stabilized plasma torch. Properties such as chemical and phase composition and characterization of the microstructure are described. Severe evaporation of Al is observed.
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Složení a struktura plazmově stříkaných prášků chromové ocele
 Schneeweiss, O. ; Voleník, Karel ; Kolman, Blahoslav Jan
Chromium steel powder (13% Cr) was sprayed by a water stabilized plasma gun. The changes of composition and structure occurring during two plasma spraying stages were studied. To characterize the main features of the first (in-flight) stage product, the molten powder particles flying in the plasma stream were trapped and quenched in liquid nitrogen. At the second stage, the particles were allowed to hit a solid substrate and to form a coating. The composition of the feedstock powder and the samples resulting from both plasma spraying stages were determined by chemical methods and X-ray microanalysis. Significant Cr-depletion was due mainly to selective oxidation of chromium at the in-flight stage. At the second stage, the composition changes were less important. Some details of the structure, in particular the distribution of Cr-atoms in the nearest neighbourhood of a Fe-atom, were assessed employing the results of Mössbauer spectroscopy.
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