Stainless steel particles (60 μm in mean diameter) cladded with an alumina shell (2 μm thick and manufactured by mechanofusion) were sprayed with an Ar-H2 (53-7 slm) d.c. plasma jet (I = 500 A, P = 28 kW, th = 56 %). Two main types of particles were collected in flight, as close as 50 mm downstream of the nozzle exit: particles with a steel core with pieces of alumina unevenly distributed at t...

Tungsten is the prime candidate material for plasma facing components of future fusion devices. Plasma spraying, with its ability to coat large areas, including non-planar surfaces, with a significant thickness, is a prospective fabrication technology for components subject to moderate heat loads, e.g., the first wall of the Demonstration Reactor (DEMO). The functionality of such coatings is cr...

Plasma-sprayed ceramic coatings are being developed for many applications such as thermal barriers and corrosion protection. In plasma spraying, the ceramic powder is heated into semi-molten droplets for projection onto a target surface by a high velocity gas stream. This coating is then rapidly cooled to form a solid layer. By repeating this process for multiple layers, a coating thickness fro...

Since 195D many studies have been devoted to physical and chemical trans-Formations in plasmas. In this paper we do not propose to make an exhaustive overview but to underline the main development points oF plasma chemistry. First after a brie-F historical review, we present the plasma chemical reactors and describe the difFerent types oF plasma generators. We discuss then oF the two main param...

V. Brožek, T. F. Kubatík, Institute of Plasma Physics CAS v.v.i. Prague, Czech Republic M. Vokáč, J. Kolísko, P. Pokorný, Czech Technical University Klokner Institute, Prague. Tungsten fibers have high tensile strength but a poor oxidation resistance at elevated temperatures. Using this first characteristic and to prevent oxidation of tungsten coated composite materials in which the primary req...

Suspension plasma spraying has aroused much research efforts over the two last decades to describe and understand in-flight mechanisms of suspension processing by developing advanced diagnostics models. This field highlighted intricate prevailing dependence coating properties, especially rich variety attainable microstructures, on thermal dynamic histories submicron particles in jet. paper give...