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

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ISSN Druckformat: 1093-3611

ISSN Online: 1940-4360

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.4 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.1 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00005 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.07 SJR: 0.198 SNIP: 0.48 CiteScore™:: 1.1 H-Index: 20

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REDUCTION OF TUNGSTEN PRECURSORS IN INDUCTIVE RF DISCHARGE PLASMA REACTORS

Volumen 7, Ausgabe 3, 2003, pp. 357-366
DOI: 10.1615/HighTempMatProc.v7.i3.90
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ABSTRAKT

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.

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