Effects of Filler Content on Dielectric Properties of Epoxy/SrTiO 3 and Epoxy/BaTiO 3 Composites

Louis Leveque , Sombel Diaham (1) , Zarel Valdez Nava (1) , Lionel Laudebat (1) , Thierry Lebey (1)

1 LAPLACE-MDCE - Matériaux Diélectriques dans la Conversion d’Energie

This paper deals with the study of the dielectric properties of polymer/high-k materials choosing an epoxy resin as the matrix and barium titanate (BaTiO 3) or strontium titanate (SrTiO 3) as micro-fillers (1 μm in diameter). Different studies on epoxy/BaTiO 3 and relatively few ones on epoxy/SrTiO 3 composites showed the increase in the permittivity with an increase in the filler content (from 0 to 50 vol.%). Whereas several authors have already investigated the dielectric strength of epoxy/BaTiO 3 , little is known regarding epoxy/SrTiO 3. In this paper, a comparison between these two types of composites will be presented. The main interest of SrTiO 3 is that the dielectric strength of the bulk ceramic material is 7 times-higher (35 kV/mm) than that of BaTiO 3 even though its dielectric constant is 10 times-lower (around 200-300).

Mots clés: finite element simulations; microcomposites; electrical characterization; epoxy/BaTiO 3; breakdown strength; complex permittivity

Domaines: Energie électrique

Louis Leveque, Sombel Diaham, Zarel Valdez Nava, Lionel Laudebat, Thierry Lebey. Effects of Filler Content on Dielectric Properties of Epoxy/SrTiO 3 and Epoxy/BaTiO 3 Composites. 2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP), Oct 2015, Ann Arbor, France. pp.701-704, ⟨10.1109/CEIDP.2015.7352070⟩. ⟨hal-02536904⟩