Publicou 4 edições por ano
ISSN Imprimir: 1093-3611
ISSN On-line: 1940-4360
Indexed in
INFLUENCE OF DC PLASMA PREHEATING ON OXIDE LAYERS FORMED BY FURNACE HEATING ON LOW CARBON STEEL SUBSTRATES AND RESULTING ADHESION/COHESION OF ALUMINA COATINGS
RESUMO
In plasma spraying the preheating of low carbon steel substrates (X40) with a rough surface resulting from grit blasting, has received an increased interest because it promotes the adhesion and cohesion (A/C) of alumina coatings. Earlier works have reported the generation of a duplex Fе3O4/Fе2O3 layer after preheating by the d.c. plasma jet. Improved A/C values were obtained for an increase in Fе3O4 content in the oxide layer. Much improved adherence values were achieved with alumina spayed on Fe1-xO layers. In this case, the Adhesion/cohesion values obtained on smooth substrate (Ra ~ 0.1 mm) were good (~ 40 MPa) and close to those obtained on rough ones (Ra ~ 5 mm). First the time evolution of the Fe1-xO layer thickness and morphology produced in a controlled atmosphere furnace was studied. Then the influence of the plasma preheating of the wilstite layers was studied by SEM, and XRD analyses. XRD analysis results indicated a slight variation in the oxide phases depending on the preheating cycles. Fе3O4 was found to increase when a decomposition of Fe1-xO into Fе3O4 was observed.
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Menecier S., Valette S., Denoirjean P., Lefort P., Invar® oxidation in CO2, Journal of Thermal Analysis and Calorimetry, 107, 2, 2012. Crossref
-
Fauchais P., Montavon G., Plasma Spraying: From Plasma Generation to Coating Structure, in Advances in Heat Transfer Volume 40, 40, 2007. Crossref
-
González Morales Noelia, Sánchez-Pérez Juan Francisco, Moreno Nicolás Jose Andres, Killinger Andreas, Modelling of Alumina Splat Solidification on Preheated Steel Substrate Using the Network Simulation Method, Mathematics, 8, 9, 2020. Crossref