Effect of specimen orientation and heat treatment on electroless Ni-PTFE-MoS2 composite coatings / M. Mohammadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 6 (11/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 6 (11/2010) . - p. 697-702 Titre : Effect of specimen orientation and heat treatment on electroless Ni-PTFE-MoS2 composite coatings Type de document : texte imprimé Auteurs : M. Mohammadi, Auteur ; M. Ghorbani, Auteur ; A. Azizi, Auteur Année de publication : 2010 Article en page(s) : p. 697-702 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bains de placage Bisulfure de Molybdène Composites Lubrifiants Nickel Le nickel est un élément chimique, de symbole Ni et de numéro atomique 28. Le nickel est un métal blanc argenté qui possède un éclat poli. Il fait partie du groupe du fer. C'est un métal ductile (malléable). On le trouve sous forme combinée au soufre dans la millérite, à l'arsenic dans la nickéline. Grâce à sa résistance à l'oxydation et à la corrosion, il est utilisé dans les pièces de monnaie, pour le plaquage du fer, du cuivre, du laiton, dans certaines combinaisons chimiques et dans certains alliages. Il est ferromagnétique, et est fréquemment accompagné de cobalt. Il est particulièrement apprécié pour les alliages qu'il forme. Polytétrafluoréthylène Revêtements:Peinture Traitement thermique Tribologie (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, the effects of simultaneous co-deposition of polytetrafluoroethylene (PTFE) and MoS2 particles on tribological properties of electroless nickel (EN) coating were studied. The influences of specimen orientation and heat treatment on EN-PTFE-MoS2 composite coatings were also investigated. Scanning electron microscopy was used to study the morphology of coatings and the distributions of the lubricant particles in the deposits. Chemical analyses of coatings were done by electron dispersive spectrometry. The phases of the coatings were identified by X-ray diffraction utilizing CuKα radiation. Wear and friction properties of the coatings were also determined by pin-on-disk wear tester. The wear investigations showed that the EN-PTFE-MoS2 composite coating performs better than EN-PTFE and EN-MoS2 coatings in terms of friction coefficient and wear resistance. PTFE and MoS2 contents of the EN-PTFE-MoS2 coating were increased by changing the specimen orientation from vertical to horizontal configuration, which leads to enhancement in tribological properties of the coating. After heat treatment, the wear rate of EN matrix composite coating decreased with corresponding change in phase structure. DOI : 10.1007/s11998-010-9255-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9255-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10396 [article]

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Preparation of hydrophobic SiO2@(TiO2/MoS2) composite film and its self-cleaning properties in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 5 (09/2017) . - p. 1147-1158 Titre : Preparation of hydrophobic SiO2@(TiO2/MoS2) composite film and its self-cleaning properties Type de document : texte imprimé Année de publication : 2017 Article en page(s) : p. 1147-1158 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Bisulfure de Molybdène Dioxyde de silicium Dioxyde de titane Encapsulation Hydrophobie Photocatalyse Revêtement auto-nettoyant Index. décimale : 667.9 Revêtements et enduits Résumé : TiO2/MoS2 composite was encapsulated by hydrophobic SiO2 nanoparticles using a sol–gel hydrothermal method with methyltriethoxysilane (MTES), titanium tetrachloride (TiCl4), and molybdenum disulfide (MoS2) as raw materials. Then, a novel dual functional composite film with hydrophobicity and photocatalytic activity was fabricated on a glass substrates via the combination of polydimethylsiloxane adhesives and hydrophobic SiO2@(TiO2/MoS2) composite particles. The influence of the mole ratios of MTES to TiO2/MoS2 (M:T) on the wettability and photocatalytic activity of the composite film was discussed. The surface morphology, chemical compositions, and hydrophobicity of the composite film on the glass substrate were investigated by scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and water contact angle (water CA) measurements. The results indicated that the composite film exhibited stable superhydrophobicity and excellent photocatalytic activity for degradation of methyl orange (MO) even after five continuous cycles of photocatalytic reaction when M/T was 7:1. The water CA and degradation efficiency for MO remained at 154° and 94%, respectively. Further, the composite film showed a good non-sticking characteristic with the water sliding angle (SA) at about 4°. The SiO2@(TiO2/MoS2) composite consisting of hydrophobic SiO2 nanoparticles and TiO2/MoS2 heterostructure could provide synergistic effects for maintaining long-term self-cleaning performance. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - Characterization - Evaluation of photocatalytic degradation performance - RESULTS AND DISCUSSION : Mechanism analysis of MTES modification - Structure and composition analysis - Optical absorption and photocatalytic activity analysis - RET surface area and pore size analysis - Influence of M/T on wettability and photocatalytic activity - Stability experiment of MO degradation - Morphology analysis - Adhesion of the composite film - Schematic analysis of self-cleaning process on composite film DOI : 10.1007/s11998-016-9907-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9907-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29149 [article]

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Recent development in new materials and coatings for superlubricity / V. L. Kakde in PAINTINDIA, Vol. LXXII, N° 3 (03/2022)  

[article]  inPAINTINDIA > Vol. LXXII, N° 3 (03/2022) . - p. 55-58 Titre : Recent development in new materials and coatings for superlubricity Type de document : texte imprimé Auteurs : V. L. Kakde, Auteur Année de publication : 2022 Article en page(s) : p. 55-58 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bisulfure de Molybdène Frottements (mécanique) Lubrification Nanoparticules Revêtement carbone diamant Tribologie (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : Superlubricity is the state in which two contacting surfaces exhibit no resistance to sliding. In coating world this type of coating play vital role that energy can be conserved by further reducing/removing friction in moving mechanical systems. The work describes an ultra-low friction phenomenon due to application of MoS2 nanoparticle coatings results in ultra-low friction coefficients in ambient atmosphere. Superlubricity reviews the latest methods and materials in this area of research that are aimed at removing friction in nano-to-micro scale machines and large scale engineering components. The additional application of solid lubricant films by powder spraying and MoS2 precipitation technologies results in low friction coefficients and a good tribological behavior under dry sliding conditions. Another unique tribological system that produces superlubricity under boundary lubrication conditions with extremely little wear. This system is a thin coating of hydrogen-free amorphous Diamond-Like-Carbon (denoted as ta-C) at 353 K in a ta¬Cita-C friction pair lubricated with pure glycerol. Note de contenu : - Survey on extremely low friction under boundary lubrication - Controlling frictional forces - Coating and lubricant in combination - Superlubricity of MoS2 and DLC - Material properties vary within a carbon triangle - DLC coating preparation - Friction of DLC/DLC in presence of glycerol and GMO En ligne : https://drive.google.com/file/d/1RUHX3KfrTELxRns6_Ml4ymdd_3ScOx4W/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37514 [article]

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Study of corrosion and friction reduction of electroless Ni-P coating with molybdenum disulfide nanoparticles / Hu Xianguo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 2 (06/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 2 (06/2009) . - p. 275-281 Titre : Study of corrosion and friction reduction of electroless Ni-P coating with molybdenum disulfide nanoparticles Type de document : texte imprimé Auteurs : Hu Xianguo, Auteur ; Xiaojun Sun, Auteur ; Yufu Xu, Auteur ; Jiucong Wan, Auteur ; Peng Jiang, Auteur Année de publication : 2009 Article en page(s) : p. 275-281 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages nickel-phosphore Bains de placage Bisulfure de Molybdène Corrosion Frottements (mécanique) Métallisation Nanoparticules Revêtement métallique Index. décimale : 667.9 Revêtements et enduits Résumé : One composite coating of Ni–P alloys containing MoS2 nanoparticles was prepared by electroless technique based on the better friction reduction ability of MoS2 and better anticorrosion property of electroless Ni–P alloys on carbon steel surfaces. Electrochemical method—that is, using Tafel polarization curves—was carried out in order to study the corrosion performance of the coating. The results indicate that the anticorrosion ability of the composite coating was decreased because of the addition of nano-MoS2 particles. The corrosional surfaces were studied and analyzed through scanning electron microscopy (SEM). The corrosion mechanism of the composite coatings was mainly ascribed to the formation of microcells around the nanosized MoS2 particles, and the active ion-like Cl- destroyed the surface film and induced the corrosion on the inside part of the coating. The friction coefficient of electroless composite coatings was measured by end-facing tribometer. It was found that the friction coefficient of the Ni–P–(nano-MoS2) composite coating decreased greatly compared with those of Ni–P electroless coatings. DOI : 10.1007/s11998-008-9131-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9131-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5642 [article]

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Wear and corrosion properties of electroless nickel composite coatings with PTFE and/or MoS2 particles / M. Mohammadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 4 (07/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 4 (07/2011) . - p. 527-533 Titre : Wear and corrosion properties of electroless nickel composite coatings with PTFE and/or MoS2 particles Type de document : texte imprimé Auteurs : M. Mohammadi, Auteur ; M. Ghorbani, Auteur Année de publication : 2011 Article en page(s) : p. 527-533 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bains de placage Bisulfure de Molybdène Composites Corrosion Nickel Le nickel est un élément chimique, de symbole Ni et de numéro atomique 28. Le nickel est un métal blanc argenté qui possède un éclat poli. Il fait partie du groupe du fer. C'est un métal ductile (malléable). On le trouve sous forme combinée au soufre dans la millérite, à l'arsenic dans la nickéline. Grâce à sa résistance à l'oxydation et à la corrosion, il est utilisé dans les pièces de monnaie, pour le plaquage du fer, du cuivre, du laiton, dans certaines combinaisons chimiques et dans certains alliages. Il est ferromagnétique, et est fréquemment accompagné de cobalt. Il est particulièrement apprécié pour les alliages qu'il forme. Polytétrafluoréthylène Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : This study focuses on the effect of co-deposition of PTFE and/or MoS2 particles on the morphology, wear, and corrosion properties of electroless nickel coating. The composite coating of EN–PTFE–MoS2 was heat treated at different temperatures for hardness investigations. The surface morphology of coatings was characterized by scanning electron microscopy. Pin-on-disk and potentiodynamic polarization tests were used to study the tribological and corrosion properties of the coatings, respectively. Results of hardness analysis revealed that the hardness of electroless nickel coatings was increased by the heat treatment, and its maximum was gained at 400°C. Wear investigations showed that simultaneous co-deposition of the PTFE and MoS2 particles into the nickel coating increased the wear resistance of the coating by about 30% and reduced the average value of friction coefficient to 0.25 from 0.65. Corrosion studies illustrated that simultaneous co-deposition of the PTFE and MoS2 particles led to reduction in corrosion resistance by 10 and 5 times that of EN coating in brine and acidic solution, respectively. Note de contenu : - Characterization of coatings - Wear properties DOI : 10.1007/s11998-011-9329-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9329-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12146 [article]

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