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Nano-mechanical properties and topography of thermosetting acrylic powder coatings / D. C. Andrei in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 912 (01/2001)
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Titre : Nano-mechanical properties and topography of thermosetting acrylic powder coatings Type de document : texte imprimé Auteurs : D. C. Andrei, Auteur ; D. Parsonage, Auteur ; B. J. Briscoe, Auteur ; S. G. Yeates, Auteur ; J. N. Hay, Auteur ; Joseph L. Keddie, Auteur Année de publication : 2001 Article en page(s) : p. 65-73 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau revêtement Peinture poudre Propriété mécanique Feuil Structure surface Thermodurcissable Acrylique dérivé polymère Résistance rayure Vernis Dureté Microdureté Module élasticité Topographie Etude expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : Both nano-scratching and nano-indentation techniques have been used to evaluated the mechanical properties of the surface of acrylic coatings, with and without added pigment. The coatings were formed from thermosetting, acrylic powders. Both types of coatings-clear and pigmented-do not exhibit any significant differences in their hardness with an increase in baking time from 7 to 15 min. According to the scratching profiles, the deformation induced at the surface is virtually elastic. Introducing the pigment causes a slight increase in the elastic modulus but not significant variation in hardness. In all coatings, the computed hardness and the elastic modulus vaues are higher near the surface (perhaps as a result of tip geometry effects), but these readily reach plateau values that are consistent with other work available in the literature. A long-range surface profiler, which provided two-dimensional and three-dimensional topographical maps of the coatings surfaces, reveals undulations in the surface with a wavelength on the order of 2-4 mm. Moreover, the topography of the pigmented coating is significantly smoother than that of the clear coating in which shallow pits (about 100 µm in diameter) are randomly distributed at the surface. The nano-mechanical properties within these pits are similar to the bulk of the coating. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5688
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 912 (01/2001) . - p. 65-73[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001220 - Périodique Bibliothèque principale Documentaires Disponible Overblasting effects on surface properties of low-carbon steel / A. W. Momber in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 6 (04/2005)
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Titre : Overblasting effects on surface properties of low-carbon steel Type de document : texte imprimé Auteurs : A. W. Momber, Auteur ; Y. C. Wong, Auteur Année de publication : 2005 Article en page(s) : p. 453-461 Note générale : Bibliogr. Langues : Américain (ame) Tags : Propriété mécanique Etude expérimentale Nettoyage surface Brasage Résistance rayure Adhérence Acier bas carbone Matériau revêtement Mouillabilité Microdureté Dureté Vickers Rugosité Index. décimale : 667.9 Revêtements et enduits Résumé : The influence of overblasting on surface properties of low-carbon steel was investigated. In detail, surface roughness, contact angle, Vickers-hardness, degree of surface contamination, and pull-off strength were evaluated. It was shown that overblasting had notable effects on the surface properties. Most importantly, the surface roughness was significantly reduced, and the microhardness of the substrate increased. Also, overblasting increased surface wettability. The influence on the pull-off strength of applied coating systems was only marginal. DOI : 10.1007/BF02733888 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02733888.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3840
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 6 (04/2005) . - p. 453-461[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001483 - Périodique Bibliothèque principale Documentaires Disponible Scratch resistance behavior of automotive plastic coatings / Rose Ann Ryntz in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 925 (02/2002)
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Titre : Scratch resistance behavior of automotive plastic coatings Type de document : texte imprimé Auteurs : Rose Ann Ryntz, Auteur ; Dottie Britz, Auteur Année de publication : 2002 Article en page(s) : p. 77-81 Note générale : Bibliogr. Langues : Américain (ame) Tags : Microdureté Dureté Etude expérimentale Essai rayage Résistance rayure Feuil Propriété mécanique Matière plastique Peinture Matériau revêtement Industrie automobile Index. décimale : 667.9 Revêtements et enduits Résumé : The sensitivity of automotive coatings particularly coatings for plastics, to scratching, has been a growing concern among automakers. Scratching may result from such predelivery events as polishing of minor defects embedded in the paint, or post-delivery events such as car wash ristles, dirt embedded under a cloth utilized in polishing the car, tree branches, and the like. Warranty cannot separate out which event is the more prevalent (e.g., predelivery or post-delivery to the customer) form of damage on plastics. Data available on coatings for metal, however, does suggest thot isocyanate-based crosslinked systems perform more poorly than their melamine-based crosslinked counterparts when exposed to in-plant (predelivery) handling. This work attempts to correlate the scratch resistance behavior of hydroxyl-functional acrylic or polyester-isocyanate-functionalized carbamate-melamine-, functionalized silane-melamine-, and hydroxyl-functional acrylic or polyester-melamine-crosslinked systems, both in their green state (right out of the oven, less than one week post-cure time) and in their infancy in the field (simulated 250 kJ Xenon arc Weather-ometer), to surface attributes such as toughness, hardness, and elasticity. Known scratch methodologies, namely the crockmeter and Ford five-finger laboratory test methods, in addition to a newly described compressive shear loading device (herein termed Scratcho), are used to compare the clearcoat systems as applied over one-component hydroxyl functional acrylic or polyester melamine crosslinked black basecoats. It is shown that the scratch testing methodology utilized to assess the scratch resistance of the coating system dictates results, and that Scratcho compares very well with crockmeter results. Functional carbamate-melamine crosslinked one-component coatings and functionalized silane-melamine crosslinked one-component coatings appear to outperform selected two-component coatings, which in turn outperform one-component hydroxyl functional acrylic or polyester melamine crosslinked coatings. Material attributes such as surface hardness, toughness (as measured through the method of essential work), and the ability to recover from an applied load are most important in the ability of the coating to resist damage. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5676
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 925 (02/2002) . - p. 77-81[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001234 - Périodique Bibliothèque principale Documentaires Disponible 001235 - Périodique Bibliothèque principale Documentaires Disponible Use of a scanning probe microscope to measure marring mechanisms and microhardness of crosslinked coatings / Weidian C. Shen in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 873 (10/1997)
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Titre : Use of a scanning probe microscope to measure marring mechanisms and microhardness of crosslinked coatings Type de document : texte imprimé Auteurs : Weidian C. Shen, Auteur ; Stanley M. Smith, Auteur ; Frank N. Jones, Auteur ; Caigui Ji, Auteur ; Rose Ann Ryntz, Auteur ; M. P. Everson, Auteur Année de publication : 1997 Article en page(s) : p. 123-135 Note générale : Bibliogr. Langues : Américain (ame) Tags : Peinture 'Propriété mécanique' Feuil Dureté Microdureté Défaut 'Microscopie champ proche' 'Résistance abrasion' Index. décimale : 667.9 Revêtements et enduits Résumé : A scanning probe microscope (SPM) was equipped with a high-modulus probe to indent coating surfaces when normal force is applied. A method for measuring microhardness with this probe is described. The high-modulus probe was also used to mar coating surfaces under controlled conditions by application of normal force plus lateral motion. Dimensions of the mars were measured by conventional scanning probe microscopy. The data were analyzed in terms of a three response, two mechanism model of marring in which three types of responses of polymeric materials : elastic, plastic deformation, and fracture, are measured. Of the three responses, only plastic deformation and fracture result in marring, and the two mechanisms can be quantified. A fourth quantity which combines plastic deformation and fracture is suggested as a method of comparing micro mar resistance of materials under specified conditions. Three crosslinked polymeric coatings were studied in detail. Two had hard crusts of material near their surfaces that responded quite differently than the bulk of the material. Note de contenu : - EXPERIMENTAL DETAILS : Specimens tested - Preparation of high-modulus probe - Force calibration - Measurement of depth of indentation and calculation of microhardness, Hmic - Hardness measurement by conventional dynamic loading technique - Methods of marring surface : Quantitaive characterization of marring mechanism - Quantitative characterization of responses to marring stress - Empirical mar resistance test
- RESULTS : Preparation and calibration of high-modulus probe, measurement of depth of indentation, and calculation of microhardness, Hmic - Methods of marring surfaces : qualitative characterization of marring mechanisms - Quantitative characterization of responses to marring stress - Results of the empirical mar resistance testPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18285
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 873 (10/1997) . - p. 123-135[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003542 - Périodique Bibliothèque principale Documentaires Disponible Vérification de la dureté du caoutchouc entre 30 et 50 D.I.D.C. / Société Bareiss (France) in PLASTIQUES & ELASTOMERES MAGAZINE, N° 53-4 (05/2001)
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Titre : Vérification de la dureté du caoutchouc entre 30 et 50 D.I.D.C. Type de document : texte imprimé Auteurs : Société Bareiss (France), Auteur ; Société Blet S.A. (France), Auteur Année de publication : 2001 Article en page(s) : p. 14-15 Langues : Français (fre) Tags : Elastomère Dureté Microdureté 'Méthode mesure' 'Appareil 'Norme essai' ASTM' DIN' 'Etude comparative' expérimentale' ASTM-D1415' DIN 53519' 'Propriété mécanique' Index. décimale : 668.4 Plastiques, vinyles Résumé : La méthode D.I.D.C. (degrés internationaux de dureté du caoutchouc), en anglais IRHD (International Rubber hardness degrees), peut être effectuée soit d'après la norme ASTM-D1415, soit d'après la méthode similaire DIN 53519. Il en résulte cependant des déviations significatives dans l'évaluation de la dureté des échantillons de caoutchouc dans les échelles de 30 à 50 IRHD. Notre propos dans cet article est d'expliciter les différences essentielles entre les deux méthodes. Note de contenu : - DISPOSITIF DE MESURE
- TOLÉRANCE
- SURFACE DE RÉFÉRENCE...
- ... ET GONFLEMENT DE L’ÉCHANTILLONPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14044
in PLASTIQUES & ELASTOMERES MAGAZINE > N° 53-4 (05/2001) . - p. 14-15[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000860 - Périodique Bibliothèque principale Documentaires Disponible