Correlation between thermal properties and aluminum fractions in CrAlN layers deposited by PVD technique
Article dans une revue avec comité de lecture
The CrAlN coatings are a good alternative to conventional CrN coatings especially for high temperature oxidation-resistance applications. Different CrAlN coatings were deposited on silicon (100) by PVD (Physical vapor deposition) technique from two targets (chromium and aluminum) in a reactive nitrogen atmosphere at aluminum applied negative voltage ( 300, 500, 700 and 900 V). The composition, structural, mechanical and thermal properties of the as-deposited coatings were systematically characterized by energy dispersive analysis of X-rays, X-ray diffraction, nanoindentation, and the ‘‘Mirage effect’’ experiments. The X-ray diffraction (XRD) data show that in general CrAlN coatings were crystallized in the cubic NaCl B1 structure, with the (1 1 1) and (2 0 0) diffraction peaks observed. Two-dimensional surface morphologies of CrAlN coatings were investigated by atomic force microscope (AFM). The results show that with increasing aluminum proportion the coatings became more compact and denser and their increased correspondingly, showing a maximum hardness of about 36 GPa (30 at% of Al) which is higher than that of CrN. Moreover, the results in this work demonstrate that the variation of aluminum fraction alter the resulting columnar grain morphology and porosity of the coatings. However, the thermal properties are greatly affected by these morphological alterations. The correlation between aluminum fraction in CrAlN coatings and its thermal properties revealed that the conductivity and the diffusivity are influenced primarily by size and shape distribution of the pores and secondarily by a decrease of the stitch parameter dimension.
Fichier(s) constituant cette publication
Cette publication figure dans le(s) laboratoire(s) suivant(s)
Visualiser des documents liés par titre, auteur, créateur et sujet.
Communication avec acteTLILI, Brahim; NOUVEAU, Corinne; BENLATRECHE, Yacine; MUSTAPHA, Nasri; LAMBERTIN, Michel (2009)In the present investigation, novel Cr/CrN, CrN/CrAlN and Cr/CrN/CrAlN multilayered coatings thin films have been developed by dual RF magnetron sputtering. They consist of superposing Cr, CrN and CrAlN layers of 50–500nm ...
Experimental investigation of the mechanical micro structural and thermal properties of thin CrAIN layers deposited by PVD technique for various aluminum percentages Article dans une revue avec comité de lectureGHRIB, Taher; TLILI, Brahim; NOUVEAU, Corinne; BENLATRECHE, Yacine; LAMBERTIN, Michel; YACOUBI, Noureddine; ENNASRI, M. (Elsevier, 2009)The thin film of chromium nitride and their derivatives obtained by the filing process physical vapor deposition attract more and more attention from industry given their high resistance to wear. This quality of these ...
Article dans une revue avec comité de lectureTLILI, Brahim; NOUVEAU, Corinne; WALOCK, Michael J.; NASRI, Mustapha; GHRIB, Taher (Elsevier, 2012)Cr/CrN/CrAlN, CrN/CrAlN and Cr/CrN thin layers were deposited by PVD (Physical Vapor Deposition). The multilayers were obtained from the combined deposition of different layers Cr, CrN and CrAlN thick films on on AISI4140 ...
Article dans une revue avec comité de lectureTLILI, Brahim; NASRI, Mustapha; AYARI, F.; NOUVEAU, Corinne (2008)Nowadays, most surface treatments are realized through vapor deposition techniques as thin hard coatings to guarantee; high surface hardness, low friction coefficient and improve wear resistance. Several experimental ...
Comparison of CrAlN layers obtained with one (CrAl) or two targets (Cr and Al) by magnetron sputtering Article dans une revue avec comité de lectureNOUVEAU, Corinne; TLILI, Brahim; AKNOUCHE, Hamid; BENLATRECHE, Yacine; PATEL, Bhavesh (Elsevier, 2012)The aim of this study is to compare the properties of CrAlN coatings obtained by magnetron sputtering with one (CrAl) or two targets (Cr and Al). The influence of parameters such as the target bias voltage, the working ...