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

Publicado 4 números por año

ISSN Imprimir: 1093-3611

ISSN En Línea: 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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INFLUENCE OF SUBSTRATE SURFACE OXIDATION STAGE ON THE MORPHOLOGY AND FLATTENING OF SPLATS

Volumen 7, Edición 2, 2003, 9 pages
DOI: 10.1615/HighTempMatProc.v7.i2.90
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SINOPSIS

When spraying on a smooth surface (Ra < 0.05 mm), two types of splats can be observed: disk shaped ones and extensively fingered ones - the transition between both depending on a substrate critical temperature (Tc). Even when Ts > Tc the splat shape depends strongly on the substrate surface oxidation stage; the aim of this paper being to study this effect. For that two substrates have been chosen: low carbon 1040 steel and low alloy steel with 1.6 wt % Cr. Alumina and 316L austenitic stainless steel particles have been sprayed with a d.c. plasma torch (PTF4 type) with a 7 mm internal diameter anode nozzle. For these substrates and particles, the transition temperature was found to be Tc ~300°C. Extensively fingered splats were obtained after preheating substrates to temperatures higher than 380°C. These substrates have been, thus, plasma preheated at 400°C and 450°C in air or nitrogen atmosphere.
Splats with bubbles were created on oxidized 1040 substrates with a morphology that suggests an expulsion of entrapped gases from the underneath porous oxide layer. The entrapped gases could also explain the splashing of splats on substrates preheated to temperatures higher than Tc. A higher degree of splashing was observed in 316L steel splats compared to Аl2О3 ones keeping the same substrate conditions. Average splat diameter (D) decreases with an increase in formed oxide layer thickness. At Ts = Tc, flattening degree for steel splats were of order 1.2 higher than those of Аl2О3. Splashing can be suppressed by preheating the substrates with an oxygen free gas flowing around the substrates that results in limiting the oxidation and substrates can be maintained at higher temperatures.

CITADO POR
  1. Tlili Samira, touhami Mohamed Zine, Bounar Nedjemeddine, Zhegib Nacereddine, Khettache Abdelkader, Etude des propriétés mécaniques de couches de molybdène déposées sur une fonte grise par projection thermique, Annales de chimie Science des Matériaux, 37, 2-4, 2012. Crossref

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