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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]
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
NickelLe 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10396
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 6 (11/2010) . - p. 697-702[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012672 - Périodique Bibliothèque principale Documentaires Disponible Nanoclay migration and the rheological response of PBAT-LDPE blends / M. Nofar in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)
[article]
Titre : Nanoclay migration and the rheological response of PBAT-LDPE blends Type de document : texte imprimé Auteurs : M. Nofar, Auteur ; M. Mohammadi, Auteur ; P. J. Carreau, Auteur Année de publication : 2021 Article en page(s) : p. 287-296 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Argile
Cloisite
Energie de surface
Morphologie (matériaux)
Nanoparticules
Polybutylène-adipate-téréphtalate
Polyéthylène basse densité
Rhéologie
Tension superficielleIndex. décimale : 668.4 Plastiques, vinyles Résumé : Blends of a poly(butylene adipate-co-terephthalate) (PBAT) and a low density polyethylene (LDPE) (80 wt%/20 wt%) were prepared through a twin screw extruder while incorporating 3 wt% Cloisite 30B (C30B) nanoclay that possessed a much higher affinity with PBAT. The blends were processed through three melt mixing strategies: ( i) direct mixing of all three components, (ii) mixing C30B and PBAT followed by mixing with LDPE, and (iii) mixing C30B and LDPE followed by mixing with PBAT. The rheological properties of each system were determined in small amplitude oscillatory shear (SAOS) experiments. The migration of C30B nanoparticles from the LDPE minor phase towards the PBAT matrix was then monitored in the blend nanocomposites prepared through strategy (iii) via SAOS time sweep experiments. It was firstly understood that the C30B migration could be detected during time sweep SAOS experiments. The migration time was observed to be frequency dependent due to the smaller length scales probed at larger frequencies. Such migration occurred even faster when the SAOS time sweep experiments were conducted at a higher temperature due to the viscosity reduction. Note de contenu : - EXPERIMENTAL : Materials - Melt compounding and blend nanocomposite preparation - Surface energy, interfacial tension, and localization analysis - Morphological analysis - Rheological measurements
- RESULTS AND DISCUSSION : Characteristics of neat polymers and c30b localization - Morphological and rheological properties of the blend and blend nanocomposites - Monitoring C30B migration through SAOS experiments - Relationship between nanoparticle migration, applied frequency, and LDPE viscosityDOI : https://doi.org/10.1515/ipp-2020-4057 En ligne : https://drive.google.com/file/d/1XhPD0BX6SWTIUyaH0mkZ-xOdYeN3qEoS/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36371
in INTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) . - p. 287-296[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23733 - Périodique Bibliothèque principale Documentaires Disponible Preparation and characterization of nanocrystalline and mesoporous strontium titanate thin films at room temperature / M. Mohammadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)
[article]
Titre : Preparation and characterization of nanocrystalline and mesoporous strontium titanate thin films at room temperature Type de document : texte imprimé Auteurs : M. Mohammadi, Auteur ; D. J. Fray, Auteur Année de publication : 2011 Article en page(s) : p. 585-593 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Matériaux nanocristallins
Sol-gel, Procédé
Température de laboratoire
Titanate de strontiumIndex. décimale : 667.9 Revêtements et enduits Résumé : The low temperature perovskite-type strontium titanate (SrTiO3) thin films and powders with nanocrystalline and mesoporous structure were prepared by a straightforward particulate sol–gel route. The prepared sol had a narrow particle size distribution with hydrodynamic diameter of about 17 nm. X-ray diffraction (XRD) revealed that the synthesized powders had a perovskite-SrTiO3 structure with preferable orientation growth along the (1 0 0) direction. TEM images showed that the average crystallite size of the powders annealed in the range 300–800°C was around 8 nm. FE-SEM analysis and AFM images revealed that the deposited thin films had mesoporous and nanocrystalline structure with the average grain size of 25 nm at 600°C. Based on Brunauer–Emmett–Taylor (BET) analysis, the synthesized powders showed mesoporous structure with BET surface area in the range 92–75 m2/g at 400–600°C. One of the smallest crystallite sizes and one of the highest surface areas reported in the literature were obtained, which can be used in many applications, such as photocatalysts. Note de contenu : EXPERIMENTAL : Preparation of the strontium titanate sol - Preparation of strontium titanate thin films - Synthesis of strontium titanate powders.
RESULTS AND DISCUSSION : Particle size - Crystal characterization - Thermal analysis - Microstructure - Specific surface area.DOI : 10.1007/s11998-011-9347-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9347-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12234
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Code-barres Cote Support Localisation Section Disponibilité 13360 - Périodique Bibliothèque principale Documentaires Disponible 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]
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
NickelLe 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:PeintureIndex. 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 propertiesDOI : 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12146
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 4 (07/2011) . - p. 527-533[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013158 - Périodique Bibliothèque principale Documentaires Disponible