Characterization of boride coatings on a ductile cast iron |
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Authors: | Omar Azouani Mourad Keddam Omar Allaoui Abdelaziz Sehisseh |
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Affiliation: | 1.Commissariat à l’Energie Atomique,Centre de Recherche Nucléaire de Draria (CRND),Draria, Algiers,Algeria;2.Laboratoire de Technologie des Matériaux, Faculté de Génie Mécanique et Génie des Procédés,USTHB,Bab-Ezzouar, Algiers,Algeria;3.Laboratoire de Génie des Procédés,Université Amar Telidji de Laghouat,Draria, Algiers,Algeria |
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Abstract: | In this work, the EN-GJS-400-15 cast iron was pack-borided in a powder mixture composed of 5% B4C, 5% NaBF4 and 90% SiC at the three temperatures: 900, 950 and 1000°C for 2, 4 and 6 h, respectively. The pack-borided EN-GJS-400-15 cast iron was characterized by the following experimental techniques: optical microscopy, XRD analysis and Microhardness Vickers tester. The growth kinetics of boride layers was also investigated. As a consequence, the boron activation energy was found to be 212.28 kJ mol–1 for the EN-GJS-400-15 cast iron. Based on a regression model, a useful equation was derived to estimate the boride layer thickness as a function of the boriding parameters (time and temperature). A good agreement was then obtained between the predicted values of boride layers thicknesses and those measured experimentally. In addition, an iso-thickness diagram was proposed to be used as a simple tool to select the boride layers thicknesses according to the potential applications of EN-GJS-400-15 cast iron in industry. |
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