Preparation and rheological behavior of lead-free graphite conducting paste / Luo Shiyong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 6 (11/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 6 (11/2013) . - p. 769-774 Titre : Preparation and rheological behavior of lead-free graphite conducting paste Type de document : texte imprimé Auteurs : Luo Shiyong, Auteur ; Xu Wencai, Auteur ; Wang Ning, Auteur ; Chen Meng, Auteur ; Lv Yong, Auteur Année de publication : 2013 Article en page(s) : p. 769-774 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Couches épaisses Dureté Vickers La mesure de dureté Vickers se fait avec une pointe pyramidale normalisée en diamant de base carrée et d'angle au sommet entre faces égal à 136°. L'empreinte a donc la forme d'un carré ; on mesure les deux diagonales d1 et d2 de ce carré à l'aide d'un appareil optique. On obtient la valeur d en effectuant la moyenne de d1 et d2. C'est d qui sera utilisé pour le calcul de la dureté. La force et la durée de l'appui sont également normalisées. Essai de dureté Graphite Rhéologie Thermocinétique Thixotropie Verre Viscoélasticité Index. décimale : 667.9 Revêtements et enduits Résumé : A lead-free graphite conducting paste was prepared by using graphite powder, lead-free barium boron low-melting glass and ethyl cellulose solution. By analyzing the sheet resistance, Vickers hardness as well as the adhesion strength of the fired film prepared by the pastes formulated with different composition, the composition of the paste with preferable properties was evaluated in weight percent: organic vehicle 60, graphite powder 15–20, and low-melting glass 20–25. The films, prepared by the pastes using the lead-free glass with a glass transition temperature of 476°C, were perfectly flat and compact after fired at a peak temperature within the range of 540 to 590°C. The sheet resistance of the fired film with glass content of 25 wt% was 135 ?/mm2 at the film thickness of 25 ± 3 ?m, while the Vickers hardness was 12.3 N/mm2 and the adhesion strength to soda lime silicate glass substrate was 45.6 N/mm2. In addition, the rheological, thixotropic, and viscoelasticity behaviors of the typical paste were characterized and the effects on the screen-printing ability were analyzed in detail. It is found that a slight flocculated network structure is formed in the paste at rest, but the flocculated structure is very slight due to the steric effect of the ethyl cellulose macromolecules and good dispersing. The rheological, thixotropic, and viscoelasticity behaviors of the typical paste were similar to those of the screen-printing pastes with a high solid content of filler. Note de contenu : - Glass content in the graphite conducting paste - Rheological behavior - Thixotropic behavior - Viscoelastic behavior DOI : 10.1007/s11998-008-9120-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9120-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19816 [article]

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