Field Grading Composites Tailored by Electrophoresis—Part 2: Permittivity Gradient in Non-Uniform Electric Field

A series of three articles present an innovative way to build advanced functionally graded materials (FGM) based on polymer/ceramic composites tailored by electrophoresis from the process principle their field grading application in power electronics. In this Part 2, it was studied impact a non-uniform electric high-k SrTiO3 particle organization within epoxy matrix. that purpose, DBC substrates with sharp metallization tracks were used generate strong divergence. This has been organize particles around reinforcement regions during process. It discovered self-arrange into conformal composite FGM layer presents local permittivity gradient: highest ε being located peak areas. new could be selectively `heal' field-induced weaknesses any high voltage electrical system using its own design.