0027649 - ÚFP 2006 RIV DE eng C - Conference Paper (international conference)
Matějíček, Jiří - Chumak, Oleksiy - Konrád, Miloš - Oberste-Berghaus, J. - Lamontagne, M.
The Influence of Spraying Parameters on In-Flight Characteristics of Tungsten Particles and the Resulting Splats Sprayed by Hybrid Water-Gas Stabilized Plasma Torch.
[Vliv technologických parametrů na interakci wolframových částic s plazmatem při stříkání hybridním hořákem se stabilizací vodou a plynem.]
Thermal Spray connects: Explore its surfacing potential! Düsseldorf: DVS-Verlag, 2005 - (Lugscheider, E.), s. 594-599
[International Thermal Spray Conference. Basel (CH), 2.5.2005-4.5.2005]
Keywords : tungsten * plasma spraying * plasma facing components * hybrid torch
Subject RIV: JG - Metallurgy

Tungsten particles were sprayed by a novel plasma torch with hybrid water-gas stabilization (WSP®-H). Several spraying parameters were varied – arc current, argon flow rate, carrier gas flow rate and spraying distance. The temperature and velocity of the individual particles were monitored by the DPV 2000 optical sensor. Individual splats were collected on polished stainless steel substrates and analyzed by SEM to assess their melting, flattening and/or fragmentation. These features were correlated with the basic in-flight particle characteristics and conditions for production of dense coatings were sought for. Significant dependence of the splats morphology on spraying parameters was found, and important improvement of particle melting at WSP®-H over conventional water stabilized plasma torch (WSP®) was registered.

Wolframový prášek byl stříkán nově vyvinutým plazmovým hořákem s hybridní stabilizací (vodou a plynem). Byl sledován vliv vybraných parametrů na chování částic v plazmatu jakož i na vlastnosti deponovaných povlaků. Bylo zaznamenáno výrazné zlepšení protavení oproti konvenčnímu hořáku WSP.
Permanent Link: http://hdl.handle.net/11104/0117722