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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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ALUMINA-COATED STEEL: ROLE OF A MAGNETITE INTERPHASE ON THE ADHESION OF THE COATINGHT

Volume 8, Issue 2, 2004, pp. 245-252
DOI: 10.1615/HighTempMatProc.v8.i2.90
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ABSTRACT

To improve the adhesion of alumina coatings on low carbon steel, it is necessary to develop an oxide layer with a controlled thickness and chemistry at its surface. The best results were obtained with a wustite layer. The Wustite layer (Fe1-xO) is developed on a smooth low carbon iron substrate by its oxidation within a furnace under a pure CO2 atmosphere. However, before spraying, a preheating of the substrate and thus of its oxide surface by the plasma is mandatory in order to eliminate condensates and adsorbates. This step of the process induces more or less the transformation of wustite into magnetite (Fe3O4).
The purpose of this paper is the study of the influence of the magnetite phase and of the thickness of the oxide layer on the adhesion of Al2O3 coatings. The results show that the control of the oxide layer thickness is very important for a good adhesion which is probably linked to the cohesion of the layer. Below a critical thickness of the oxide layer the rapture of the coating is adhesive (at the interface alumina-iron oxide). Over it is a cohesive rupture inside the oxide layer. The composition of the oxide plays a role that is not still completely clarified, but the physico-chemical continuity of the phases present in the interfacial zone seems to be a crucial point.

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