Use of hollow glass microsphere in low density NBR insulation system for aerospace applications / B. A. Praveen Kumar in PAINTINDIA, Vol. LXI, N° 12 (12/2011)

[article]  inPAINTINDIA > Vol. LXI, N° 12 (12/2011) . - p. 53-55 Titre : Use of hollow glass microsphere in low density NBR insulation system for aerospace applications Type de document : texte imprimé Auteurs : B. A. Praveen Kumar, Auteur ; G. Karthikeyan, Auteur Année de publication : 2011 Article en page(s) : p. 53-55 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caoutchouc -- Propriétés mécaniques Caoutchouc nitrile-butadiène Charges (matériaux) Industries aérospatiales Isolation thermique Microbilles Microsphères Stabilité thermique Verre Index. décimale : 668.9 Polymères Résumé : Solid particulate fillers usually increase both the Young's modulus and the density of polymers. The incorporation of hollow glass microspheres into polymers enables a better balance between mechanical properties and density, combined with benefits in terms of processing and surface quality. These hollow microspheres are capable of improving the flow characteristics of a polymer in the mould, and reduce mould shrinkage. These properties of hollow microspheres can be well utilized in NBR based rubber compounds, which are used as thermal insulation systems for protection of solid rocket motor case from high temperature combustion gases. Insulators with low density are of immense use in aerospace applications, since they enhance payload capability and reduce mission cost. Attempts are made to reduce density of elastomer compounds by incorporating these hollow glass microspheres. The effects of process conditions, level of microspheres and treatment with liquid polymer on density have been discussed Changes in density of the NBR correlated with extent of the break down of hollow microspheres have been brought out. This article also emphasizes the changes in the mechanical properties and thermal properties in NBR insulation system after the incorporation of these microspheres. Note de contenu : - NBR based rocket motor insulation - Experimental aspects : Materials - Processing - Characterization - Results and discussions : Effect of processing methods on density - Effect of adding liquid rubber on density - Stress-strain behaviour - Applications of hollow microspheres Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13832 [article]

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