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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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CHARACTERISATION OF AL2O3 PLASMA SPRAYING BY ATOMIC EMISSION SPECTROSCOPY AND NEAR INFRARED PYROMETRY

Volumen 15, Ausgabe 2, 2011, pp. 87-95
DOI: 10.1615/HighTempMatProc.v15.i2.10
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ABSTRAKT

Plasma temperature measurement and 2D light intensity mapping of an industrial plasma spraying equipment developed by 2PS (14−45 kW, Ar/H2 plasma, Al2O3 powder) is performed based on atomic emission spectroscopy and near infrared pyrometry. The influence of the process parameter variations onto the plasma electron density with and without Al2O3 powder has been identified. Plasma temperature and electron density are determined by Atomic Emission Spectroscopy (a monochromator with focal length of 320 mm is used, allowing spectra acquisitions on a wide spectral range up to 70 nm) based on the H-beta line broadening in the assumption of plasma equilibrium. A 2D pyrometer (vision zone 10 × 10 mm2) with the 0.860 μm spectral band has been applied to obtain the radiative intensity mapping of the jet. A 1 spot monochromatic pyrometer (in the 1.5 μm spectral range) sighted to the impact area has been used to control in real time the substrate brightness temperature versus process parameters. The following variations of operational conditions were studied: hydrogen flow rate (0 − 15 l/min), powder flow rate (10 − 20 g/min) and current (500 − 700 A), argon flow rate was fixed (70 1/min). It has been found that along the jet axis (up to 40 mm from the nozzle) the temperature and the electron density vary in the range 13,000 − 11,000 K and 1.4 × 1017 − 4 × 1016 cm−3, respectively. The 2D radiation intensity fields are rather sensitive to the variation of current and H2 flow rate and visualize the plasma flow pattern.

REFERENZEN
  1. Landes, K., Diagnostics and on-line-control of a plasma spraying process.

  2. Vardelle, M., Vardelle, A., Fauchais, P., and Moreau, C., Pyrometer system for monitoring the particle impact on a substrate during plasma spray process.

  3. Griem, H. R., Spectral Line Broadening by Plasma.

  4. Ignatiev, M., Smurov, I. Y., Flamant, G., Senchenko, V., and Dozhdikov, V., Two-dimensional resolution pyrometer for real-time monitoring of temperature image in laser materials processing.

  5. Ignatiev, M., Smurov, I., Flamant, G., Senchenko, V., Dozhdikov, V., and Bertrand, P., High speed pyrometers for temperature measurements in laser material treatment.

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