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

Published 4 issues per year

ISSN Print: 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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TRANSIENT EVOLUTION AND SHIFTS OF SIGNALS EMITTED BY A D.C. PLASMA GUN (TYPE PTF4)

Volume 7, Issue 2, 2003, 11 pages
DOI: 10.1615/HighTempMatProc.v7.i2.70
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ABSTRACT

The on line monitoring of a plasma gun spray parameters is in full development in industrial plasma spray processes in order to achieve a better reproducibility and reliability of the coatings. This on line monitoring in particular allows to compensate for the torch voltage drop with the electrode erosion but there is a need to determine when this erosion becomes disastrous. To achieve such a goal, the measurement of the signals emitted by a plasma torch (sound and voltage) must be performed very precisely at the frequency of the fluctuation of the arc, but the drift due to the erosion of the electrodes must also be taken into account. The key issue is to know which time scale would be the most relevant to indicate how far can the electrodes could be used before they have to be changed. This paper presents in a first section, the different time scales with their physical phenomena related to: from a short time range of a few microsecond related to the fluctuations of the arc root to the electrode lifetime in the range of tens of hours), and explain how they are linked. The second part is dedicated to the influence of the way to ignite the torch, by studying the transient arc current evolution during the first instant of the restart sequence and its consequence on the electrode erosion. It is shown hereunder, that if there is no burst of arc current intensity, the anode electrode is prevented from premature erosion.

CITED BY
  1. Liu T., Planche M. P., Kanta A. F., Deng S., Montavon G., Deng K., Ren Z. M., Plasma Spray Process Operating Parameters Optimization Based on Artificial Intelligence, Plasma Chemistry and Plasma Processing, 33, 5, 2013. Crossref

  2. Colmenares-Angulo Jose, Molz Ronald, Hawley David, Seshadri Ramachandran Chidambaram, Thorium-Free Versus Thoriated Plasma Gun Electrodes: Statistical Evaluation of Coating Properties, Journal of Thermal Spray Technology, 25, 4, 2016. Crossref

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