Heat transfer with plastics versus metals / Tobias Epple in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 41-43 Titre : Heat transfer with plastics versus metals : Which fillers are best suited for thermally conductive plastics, and how they can help replace metals Type de document : texte imprimé Auteurs : Tobias Epple, Auteur Année de publication : 2021 Article en page(s) : p. 41-43 Langues : Anglais (eng) Catégories : Charges (matériaux) Matières plastiques -- Additifs Métaux -- Suppression ou remplacement Polyamide 6 Thermocinétique Index. décimale : 668.4 Plastiques, vinyles Résumé : For many components, the use of metal-replacing plastics is an attractive possibility e. g. to save weight and benefit from enhanced design freedom. In various applications, however, the thermal conductivity of the polymers is of equal importance. There are different additives that can be used to enhance this property. In the development of two polyamide families, Domo Engineered Materials investigated which of those additives are especially useful to this end, and applied Light Flash Analysis to examine the materials. Note de contenu : - Two additives ahead of the rest - Part geometry determines thermal conductivity - Two measuring methods, one device - Metals often over-designed - Two case stories - Figure : By way of adapting the specimen, the LFA 467 HyperFlash device from Netzsch enables both through-plane and in-plane TC measuring - Fig. 1 : In-plane thermal conductivity measuring of PA6 with various different fillers: the thermal conductivity (TC) depends on the additive. In some cases it rises considerably at an additive content of 40 % or higher - Fig. 2 : Through-plane thermal conductivity measuring of PA6 with various different fillers: boron nitride and graphite deliver the best values - Fig. 3 : Combined results of in-plane and through-plane thermal conductivity measuring: isotropic materials show TC values on the bisector of the quadrant. The TC values of anisotropic materials are far away from the axis. Therefore, proper material selection must not only take the TC value in consideration, but also the part geometry - Fig. 4 : By way of adapting the specimen, the LFA 467 HyperFlash device from Netzsch enables both through-plane and in-plane TC measuring - Fig. 5 : Example of heat transfer through the heat sink of an LED: the heat (T2) on surface A passes through the heat sink (heat flow Q) and can then dissipate to the environment. The difference between T1 and T2 results in the thermal conductivity (h) - Table : Comparison of thermal conductivities of plastics and metal: the higher the thermal conductivity of the material, the smaller the difference in temperature between both points En ligne : https://drive.google.com/file/d/1dtsdpVbwWksFJP2uhQLGbFYRAGCmWf2F/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36178 [article]

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