[article]
| 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 test |
| Permalink : |
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
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