Characterisation of R.F. magnetron sputtered Cr-N,Cr-Zr-N and Zr-N coatings |
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| Authors: | Mamoun Fellah Linda Aissani Mohammed Abdul Samad Said Mechacheti Mohamed Zine Touhami Alex Montagne |
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| Affiliation: | 1. Mechanical Engineering Department, ABBES Laghrour – Khenchela University, P.O 1252, 40004, Algeria;2. Materials, Tribology, Surface and Interfaces Group, Laboratory of Foundry, Annaba University BO, 12 CP 23000, Algeria;3. Materials, Tribology, Surface and Interfaces Group, Laboratory of Foundry, Annaba University BO, 12 CP 23000, Algeria;4. Physics Department, ABBES Laghrour – Khenchela University, P.O 1252, 40004, Algeria;5. Mechanical Engineering Department, King Fahd University of Petroleum &6. Minerals, Box 1180, Dhahran 31261, KSA;7. Laboratory of Foundery, University of Annaba, P.O 12, Annaba 23000, Algeria;8. Mechanical Surfaces and Materials Processing Laboratory, ENSAM Arts et métiers Paris Tech 8 Boulevard Louis XIV, 59800 Lille, France |
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| Abstract: | Binary Cr-N, Zr-N and Cr-Zr-N films were synthesised using a R.F. reactive magnetron sputtering technique by co-sputtering Cr and Zr. The crystalline structure, morphology, mechanical and tribological properties of the films as a function of Zr content were characterised by X-ray diffraction, microanalysis X (WDS, EDS), X-ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscopy, nanoindentation, scratch adhesion and pin-on-disc sliding wear tests. The residual stress was calculated with the Stoney formula. The Cr-Zr-N films exhibit a two-phase microstructure, containing a cubic (CrN, ZrN) with hexagonal (Cr2N, Zr2N) phases, as shown by X-ray diffraction. As the Zr content increased, a columnar and compact structure is developed with a low surface roughness. The results reveal that the mechanical and tribological properties of the films were found to depend on the Zr content and the hardness (maximum 26.3?GPa) is greatly improved in comparison with CrN and ZrN films, especially at 31?at.-% Zr. In the scratch test, the hardest film (Cr0.18Zr0.31N0.47) exhibited an adhesive failure at Lc2?=?34.3?N. |
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| Keywords: | RF magnetron sputtered coatings CrN ZrN Cr-Zr-N Ternary chromium alloy Hardness Wear properties |
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