https://sam.ensam.eu:443 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Mon, 13 Apr 2026 02:39:43 GMT 2026-04-13T02:39:43Z http://hdl.handle.net/10985/19799 Mechanical and Tribological Behaviors of Nanocomposite Titanium Nitrides Coatings BELGROUNE, Ahlam; AISSANI, Linda; SALHI, Faiza; ALHUSSEIN, Akram; NOUVEAU, Corinne TiN coatings with a thickness of 2 μm were deposited using the magnetron sputtering has developed rapidly over the last decade in such a way that it has become an established process of choice for the deposition of a wide range in various applications for different domains as it gives excellent performance in many aspects. In view of this, we have deposited the TiN coatings by magnetron sputtering using Ti target at different nitrogen content to study the influence of the nitrogen content on the mechanical properties and tribological behaviors of the TiN coatings were systematically investigated using nanoindentation and a pin-on-disk tribometer. Nanoindentation results shows that the hardness and Young's modulus of the TiN coatings increase with increasing N content in the coatings.Wear test results indicate that the wear rate and friction coefficient of the XC100 steel substrate were significantly reduced by deposition of the TiN coatings, and the tribological behaviors of the TiN coatings are strongly dependent on the nitrogen content in the coatings. Fri, 01 Jan 2021 00:00:00 GMT http://hdl.handle.net/10985/19799 2021-01-01T00:00:00Z BELGROUNE, Ahlam AISSANI, Linda SALHI, Faiza ALHUSSEIN, Akram NOUVEAU, Corinne TiN coatings with a thickness of 2 μm were deposited using the magnetron sputtering has developed rapidly over the last decade in such a way that it has become an established process of choice for the deposition of a wide range in various applications for different domains as it gives excellent performance in many aspects. In view of this, we have deposited the TiN coatings by magnetron sputtering using Ti target at different nitrogen content to study the influence of the nitrogen content on the mechanical properties and tribological behaviors of the TiN coatings were systematically investigated using nanoindentation and a pin-on-disk tribometer. Nanoindentation results shows that the hardness and Young's modulus of the TiN coatings increase with increasing N content in the coatings.Wear test results indicate that the wear rate and friction coefficient of the XC100 steel substrate were significantly reduced by deposition of the TiN coatings, and the tribological behaviors of the TiN coatings are strongly dependent on the nitrogen content in the coatings. http://hdl.handle.net/10985/19636 Effect of annealing treatment on the microstructure, mechanical and tribological properties of chromium carbonitride coatings AISSANI, Linda; FELLAH, Mamoun; RADJEHI, Lamia; ALHUSSEIN, Akram; NOUVEAU, Corinne; MONTAGNE, Alex Chromium nitrides were deposited by RF reactive magnetron sputtering from a Cr target on high carbon steel substrates XC100 (1.17 wt% carbon) in a N2 and Ar gas mixture. In order to investigate the formation of chromium nitrides, carbide and carbonitride compounds were subjected to vacuum annealing treatment for 1 h at various temperatures ranging from 700 to 1000 °C. The samples were characterized by EDS, XPS, XRD, SEM, nanoindentation and tribometry. The results showed the emergence of Cr2N and CrN during the early stages of annealing and the appearance of chromium carbonitride phases only at 900 °C. The (111) preferred orientation of the fcc CrN phase was changed to (002) at 900 °C in parallel with the appearance of chromium carbides. Nanoindentation tests revealed a gradual increase of the Young's modulus from 198 to 264 GPa when increasing the annealing temperature, while the hardness showed a maximum value (H = 22.4 GPa) at 900 °C. The low friction coefficient of the Crsingle bondCsingle bondN coating against a 100Cr6 ball was approximately 0.42 at 900 °C. The enhancement of mechanical and tribological properties was attributed to the stronger bonding Crsingle bondC at the CrN/XC100 interfaces as confirmed by XPS results. Tue, 01 Jan 2019 00:00:00 GMT http://hdl.handle.net/10985/19636 2019-01-01T00:00:00Z AISSANI, Linda FELLAH, Mamoun RADJEHI, Lamia ALHUSSEIN, Akram NOUVEAU, Corinne MONTAGNE, Alex Chromium nitrides were deposited by RF reactive magnetron sputtering from a Cr target on high carbon steel substrates XC100 (1.17 wt% carbon) in a N2 and Ar gas mixture. In order to investigate the formation of chromium nitrides, carbide and carbonitride compounds were subjected to vacuum annealing treatment for 1 h at various temperatures ranging from 700 to 1000 °C. The samples were characterized by EDS, XPS, XRD, SEM, nanoindentation and tribometry. The results showed the emergence of Cr2N and CrN during the early stages of annealing and the appearance of chromium carbonitride phases only at 900 °C. The (111) preferred orientation of the fcc CrN phase was changed to (002) at 900 °C in parallel with the appearance of chromium carbides. Nanoindentation tests revealed a gradual increase of the Young's modulus from 198 to 264 GPa when increasing the annealing temperature, while the hardness showed a maximum value (H = 22.4 GPa) at 900 °C. The low friction coefficient of the Crsingle bondCsingle bondN coating against a 100Cr6 ball was approximately 0.42 at 900 °C. The enhancement of mechanical and tribological properties was attributed to the stronger bonding Crsingle bondC at the CrN/XC100 interfaces as confirmed by XPS results. http://hdl.handle.net/10985/20256 Relationship between structure, surface topography and tribo-mechanical behavior of Ti-N thin films elaborated at different N2 flow rates AISSANI, Linda; ALHUSSEIN, Akram; AYAD, Abdelhak; ZGHEIB, Elia; BELGROUNE, Ahlam; ZAABAT, Mourad; BARILLE, Régis; NOUVEAU, Corinne Titanium nitride films were deposited by reactive magnetron sputtering on Si (100) wafers, glass and Ti6Al4V substrates. The film deposition was carried out in a gas mixture of Ar and N2. The nitrogen content was varied between 0 and 30 % of the total gas mixture. This variation led to the formation of different films with different microstructures. The microstructure of the Ti-N coatings presented nanocomposites with a low tendency to surface oxidation. From a pure Ti to tetragonal Ti2N and cubic Ti-N microstructures, the films showed a (111) TiN plane growth that led to an increase in the lattice strain and a decrease in the grain size when increasing the nitrogen flow rate. The water-film contact angle measurements showed that the surface hydrophobicity increased with the increase of nitrogen content in the film. Mechanical properties were measured and a strong dependence between microstructure and hardness was found. The Ti-N deposited under 20 % of N2 exhibited the highest hardness, the best adhesion and wear resistance, and the lowest friction coefficient with the presence of (111) fiber texture. Fri, 01 Jan 2021 00:00:00 GMT http://hdl.handle.net/10985/20256 2021-01-01T00:00:00Z AISSANI, Linda ALHUSSEIN, Akram AYAD, Abdelhak ZGHEIB, Elia BELGROUNE, Ahlam ZAABAT, Mourad BARILLE, Régis NOUVEAU, Corinne Titanium nitride films were deposited by reactive magnetron sputtering on Si (100) wafers, glass and Ti6Al4V substrates. The film deposition was carried out in a gas mixture of Ar and N2. The nitrogen content was varied between 0 and 30 % of the total gas mixture. This variation led to the formation of different films with different microstructures. The microstructure of the Ti-N coatings presented nanocomposites with a low tendency to surface oxidation. From a pure Ti to tetragonal Ti2N and cubic Ti-N microstructures, the films showed a (111) TiN plane growth that led to an increase in the lattice strain and a decrease in the grain size when increasing the nitrogen flow rate. The water-film contact angle measurements showed that the surface hydrophobicity increased with the increase of nitrogen content in the film. Mechanical properties were measured and a strong dependence between microstructure and hardness was found. The Ti-N deposited under 20 % of N2 exhibited the highest hardness, the best adhesion and wear resistance, and the lowest friction coefficient with the presence of (111) fiber texture. http://hdl.handle.net/10985/19686 Evolution of microstructure, mechanical and tribological properties of vanadium carbonitride coatings sputtered at different nitrogen partial pressures AISSANI, Linda; ALHUSSEIN, Akram; RADJEHI, Lamia; LAKDHAR, Issam; ZGHEIB, Elia; NOUVEAU, Corinne Vanadium carbide coatings were deposited by R.F. reactive magnetron sputtering at different nitrogen partial pressures. The structures and the mechanical and tribological behaviour of these coatings were studied. By using a combined approach of EDS and WDS, it has been shown that increasing nitrogen concentration from 0 to 27 at.% led to decrease the carbon content from 48.50 to 30.50 at.%. All coatings exhibited a dominant fcc-VC structure with additional fractions of vanadium nitrides, as determined by XRD. Nanoindentation measurements showed that the highest hardness of 26.1 GPa was obtained for the coating with a (N + C) / (V) ratio equal to 1.44. The transition in brittleness-ductile failure mode was noticed with increasing nitrogen content. This adhesive feature can prevent phase separation and improves the wear resistance of the coatings. Moreover, the nitrogen partial pressure showed a significant influence on the friction coefficient because of film density and residual stress effects. Tue, 01 Jan 2019 00:00:00 GMT http://hdl.handle.net/10985/19686 2019-01-01T00:00:00Z AISSANI, Linda ALHUSSEIN, Akram RADJEHI, Lamia LAKDHAR, Issam ZGHEIB, Elia NOUVEAU, Corinne Vanadium carbide coatings were deposited by R.F. reactive magnetron sputtering at different nitrogen partial pressures. The structures and the mechanical and tribological behaviour of these coatings were studied. By using a combined approach of EDS and WDS, it has been shown that increasing nitrogen concentration from 0 to 27 at.% led to decrease the carbon content from 48.50 to 30.50 at.%. All coatings exhibited a dominant fcc-VC structure with additional fractions of vanadium nitrides, as determined by XRD. Nanoindentation measurements showed that the highest hardness of 26.1 GPa was obtained for the coating with a (N + C) / (V) ratio equal to 1.44. The transition in brittleness-ductile failure mode was noticed with increasing nitrogen content. This adhesive feature can prevent phase separation and improves the wear resistance of the coatings. Moreover, the nitrogen partial pressure showed a significant influence on the friction coefficient because of film density and residual stress effects. http://hdl.handle.net/10985/19683 Influence of film thickness and Ar N2 plasma gas on the structure and performance of sputtered vanadium nitride coatings AISSANI, Linda; ALHUSSEIN, Akram; GHELANI, Laala; ZAABAT, Mourad; NOUVEAU, Corinne We investigated the effect of film thickness on the structure and properties of VN coatings deposited by magnetron sputtering in an argon and nitrogen atmosphere. The nitrogen percentage was changed between 10 and 20%. Firstly, structural and morphological properties of VN films were observed, analyzed and subsequently followed by a detailed investigation on the mechanical and tribological properties of these coatings. It has been shown that film structure, hardness and wear resistance significantly changed with varying the film thickness and the nitrogen percentage. In the case of films deposited under 10%N2, the presence of V2N phase was evident. With increasing nitrogen ratio in the deposition chamber from 10 to 20%, the structure was changed from (hc)V2N to multi phases of V2N and (fcc) VN (formation of different vanadium nitrides). The thick films containing more nitrogen were slightly dense compared to the thinner ones presenting rough surface and columnar morphology. Nanoindentation measurements showed that film mechanical behavior depends on its thickness, nitrogen percentage and microstructural features. The film hardness first increased with its thickness and then decreased. The highest hardness of 26.2 GPa was obtained for the film deposited under 20%N2, which is correlated with its dense structure and film stoichiometry. The film thickness has a significant effect on the tribological properties of VN films. The minimum friction coefficient of 0.4 was found for the thickest film of 2500 nm. The wear rate gradually decreased with increasing the film thickness, due to the high hardness, presence of VN phase and the strong adhesion between film and substrate. Tue, 01 Jan 2019 00:00:00 GMT http://hdl.handle.net/10985/19683 2019-01-01T00:00:00Z AISSANI, Linda ALHUSSEIN, Akram GHELANI, Laala ZAABAT, Mourad NOUVEAU, Corinne We investigated the effect of film thickness on the structure and properties of VN coatings deposited by magnetron sputtering in an argon and nitrogen atmosphere. The nitrogen percentage was changed between 10 and 20%. Firstly, structural and morphological properties of VN films were observed, analyzed and subsequently followed by a detailed investigation on the mechanical and tribological properties of these coatings. It has been shown that film structure, hardness and wear resistance significantly changed with varying the film thickness and the nitrogen percentage. In the case of films deposited under 10%N2, the presence of V2N phase was evident. With increasing nitrogen ratio in the deposition chamber from 10 to 20%, the structure was changed from (hc)V2N to multi phases of V2N and (fcc) VN (formation of different vanadium nitrides). The thick films containing more nitrogen were slightly dense compared to the thinner ones presenting rough surface and columnar morphology. Nanoindentation measurements showed that film mechanical behavior depends on its thickness, nitrogen percentage and microstructural features. The film hardness first increased with its thickness and then decreased. The highest hardness of 26.2 GPa was obtained for the film deposited under 20%N2, which is correlated with its dense structure and film stoichiometry. The film thickness has a significant effect on the tribological properties of VN films. The minimum friction coefficient of 0.4 was found for the thickest film of 2500 nm. The wear rate gradually decreased with increasing the film thickness, due to the high hardness, presence of VN phase and the strong adhesion between film and substrate. http://hdl.handle.net/10985/20721 Effect of carbon content on structural, mechanical and tribological properties of Cr-V-C-N coatings AISSANI, Linda; ALHUSSEIN, Akram; BELGROUNE, Ahlam; ZGHEIB, Elia; BARILLE, Régis; NOUVEAU, Corinne; MONTAGNE, Alex Cr-V-C-N thin films were deposited on XC100 steel and Si(100) wafers by a radio frequency magnetron sputtering technique using chromium and vanadium targets in an Ar/N2/CH4 mixture atmosphere. The microstructure, mechanical and tribological properties of coatings were investigated as a function of carbon content. It has been found that the quaternary Cr-V-C-N coatings containing a low percentage of carbon (≤ 12.4 at.%) exhibited a mixture of chromium and vanadium nitrides nano-sized crystallite phases. The coatings containing a high carbon content (> 25 at.%) were consisted of nitride and carbide phases, where the large carbon atoms inserted through CrN and VN. Mechanical properties of the Cr-V-C-N coatings were influenced by the carbon addition. The maximum hardness value of 28.3 GPa was obtained for the coating containing 28 at.% of carbon which is related to the adhesion strength enhanced by the formation of carbide and nitride mixture. Addition of carbon into the Cr-V-N coating led to significantly decrease its friction coefficient from 0.63 to 0.47. The formation of carbides through the dispersion of carbon in the grains effectively improved the density of the Cr-V-C-N coatings so that the coating deposited under a high CH4 flow rate exhibited a better wear resistance than the other Cr-V-N and Cr-V-C coatings. Fri, 01 Jan 2021 00:00:00 GMT http://hdl.handle.net/10985/20721 2021-01-01T00:00:00Z AISSANI, Linda ALHUSSEIN, Akram BELGROUNE, Ahlam ZGHEIB, Elia BARILLE, Régis NOUVEAU, Corinne MONTAGNE, Alex Cr-V-C-N thin films were deposited on XC100 steel and Si(100) wafers by a radio frequency magnetron sputtering technique using chromium and vanadium targets in an Ar/N2/CH4 mixture atmosphere. The microstructure, mechanical and tribological properties of coatings were investigated as a function of carbon content. It has been found that the quaternary Cr-V-C-N coatings containing a low percentage of carbon (≤ 12.4 at.%) exhibited a mixture of chromium and vanadium nitrides nano-sized crystallite phases. The coatings containing a high carbon content (> 25 at.%) were consisted of nitride and carbide phases, where the large carbon atoms inserted through CrN and VN. Mechanical properties of the Cr-V-C-N coatings were influenced by the carbon addition. The maximum hardness value of 28.3 GPa was obtained for the coating containing 28 at.% of carbon which is related to the adhesion strength enhanced by the formation of carbide and nitride mixture. Addition of carbon into the Cr-V-N coating led to significantly decrease its friction coefficient from 0.63 to 0.47. The formation of carbides through the dispersion of carbon in the grains effectively improved the density of the Cr-V-C-N coatings so that the coating deposited under a high CH4 flow rate exhibited a better wear resistance than the other Cr-V-N and Cr-V-C coatings.