A retainer in the stator of an electrical machine holds a plurality of stacked stator laminations in compression at an inner diameter of a stator core. The device includes an interfacial layer formed on the substrate; a high dielectric constant layer covering the interfacial layer that comprises a material that is selected from the group consisting of Ta2O5, Ta25 wherein x ranges from greater than 0 to 0. A disengagement rod flexibly is coupled to a spring member disposed on the sector at a first end and further coupled to a track release lever at a second end. The thermoplastic resin is infiltrated to a depth of 0.