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Utilization of plasma spraying for production of nanocrystalline ceramic materials
Chráska, Tomáš
The technique of plasma spraying is now being investigated as an apt candidate for production of nanocrystalline materials.In the conventional plasma spraying (PS) process,powder particles injected into a high temperature plasma jet are quickly melted and propelled onto a substrate where they spread upon impact and rapidly solidify.Due to the rapid solidification, the conventional PS.
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PALS - status and selected results
Ullschmied, Jiří
The PALS iodine terawatt laser system has been successfully serving both domestic and foreign researchers for already the third year, representing thus an important part the network of large European lasers.The PALS research activities in the period 2000-2002 are summarized in the paper, and its present technical capabilities and prospects of their further development are described.
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Preparation and Properties of Spheroised Tungsten Powder
Brožek, V. ; Dufek, V. ; Neufuss, Karel ; Šarman, L.
In our series of experiments ball shaped tungsten particles were prepared.Tungsten microballs can be used in filters for chemical and metallurgical industry.Possible applications can be awaited in nuclear fusion reactors.Tungsten balls are tested also as special type of ammunition.Coarse tungsten powder of OSRAM Sylvania Inc provenience was screened into fractions 40-60ćm, 60-100ćm.
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Study of the Phase Transfer in Titanium-Skandium Alloys
Brožek, V. ; Dufek, V. ; Rohan, Pavel ; Ettmayer, P.
The contribution describes the attempt to use the dilatometric method for determination of phase transformation in titanium alloys with 5wt% and 15wt% of scandium.Arc melting Ti-Sc alloys, rolling of obtained ingots and their adjustment to test probes.The dilatometric measurements proceeded to temperature 1200Cbecause even most pure accessible argon atmosphere did not prevent from.
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Mechanical Properties of Plasma Sprayed Coatings at Low and High Deformations
Nohava, Jiří
Ceramic or metal coatings deposited by plasma spraying consist of thin splats and porosity between 2 and 15%.The structure is one of the main factors, controlling mechanical properties of the coating.Sprayed materials are know to be elastically anisotropic and having Young's moduli at small deformations much smaller than those of sintered materials.The typical splat and porosity.
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