Library Subscription: Guest
Begell Digital Portal Begell Digital Library eBooks Journals References & Proceedings Research Collections
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v7.i3.90
pages 357-366

REDUCTION OF TUNGSTEN PRECURSORS IN INDUCTIVE RF DISCHARGE PLASMA REACTORS

Jan Janca
Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlarska 2, CZ-611 37 Brno, Czech Republic
Marek Elias
Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlarska 2, CZ-611 37 Brno, Czech Republic
Vlastimil Brozek
Institute of Chemical Technology, Technicka 5, CZ-16628 Prague; Institute of Plasma Physics, ASCR, Za Slovankou 3,182 00 Prague 8

ABSTRACT

The new plasma chemical reduction techniques of tungsten precursors were investigated with the aim of producing tungsten powder with high sinterable activity, permitting to rise the density of tungsten compact products above the hitherto technological limit. The application of non-isothermic hydrogen plasma allows the iniciation of reduction processes at low temperature of neutral gas. The high electron temperature makes possible the increase in atomic hydrogen concentration entering the reduction process. For the reduction of pulverised ammonium paratungstate (APT) to tungsten metal powder by hydrogen plasma we used hydrogen as the main gas, in some cases admixture of argon was applied. The series of experiments with APT of different granulometry demonstrated that reduction takes place even at 600 °C and that the kinetics of the reaction is mainly influenced by diffusion of hydrogen into solid phase pores.


Articles with similar content:

CATALYCITY OF SPACE SHUTTLE MATERIAL: INFLUENCE OF METALLIC POLLUANTS ON THEIR AGEING AND DETERMINATION OF THEIR REGENERATION
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, Vol.10, 2006, issue 4
Jacques Amouroux, L. Benabdelmoumene, S. Cavadias, C. Guyon
CATALYCITY AND AGEING STUDY OF SPACE SHUTTLE MATERIAL: REGENERATION OF THEIR ORIGINAL CATALYTIC PROPERTIES
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, Vol.13, 2009, issue 3-4
Jacques Amouroux, V. Micheli, S. Cavadias, G. Da Rold, N. Laidani, C. Guyon
A FLEXIBLE LOW PRESSURE PLASMA PROCESS FOR THE DEPOSITION OF COMPLEX THICK OXIDE COATINGS
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, Vol.13, 2009, issue 3-4
Daniel Morvan, F. Rousseau, S. Awamat
THE EFFECTS OF CATHODE SPUTTERING ON IRON SURFACE
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, Vol.6, 2002, issue 3
Jolanta Baranowska
ANALYSIS OF PLASMA JETS GENERATED IN GAS AND GAS-WATER TORCHES
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, Vol.11, 2007, issue 1
T. Kavka, A. Maslani, O. Chumak, V. Sember, Vladimir Kopecky