Jack Chapman's research while affiliated with General Dynamics and other places

... Micathe state-of-the-art ground-wall insulation-is a group of phyllosilicate minerals with layered platelet crystalline structures that can be split or delaminated into thin sheet texture to provide superior electrical discharge resistance [5]. Bulk insulation materials have been widely studied and systems based on 2D-platelet fillers with better performance in discharge resistance and enhanced thermal and mechanical properties compared to conventional insulation systems have been reported [6]. Although the bulk properties play a key role in the materials performance, under the extreme environment of high-voltage, the surface discharge resistance can be a primary factor for the lifetime of high/medium-voltage applications. ...

... They can be used independently or in combination depending on the application of the composites with a high enough content (lower than 10 wt. %) of nano-fillers [5][6][7][8][9]. According to A. Buketov et al, filler particles of different physical nature and dispersion affect the structural transformation and thermo physical of nano composite materials [16]. ...

... Although the epoxy nanocomposites are more frequently employed because of their good electrical properties, they are also suggested as insulating materials [52,149]. Some nanofillers found an application for electrostatic discharge purposes (e.g., in aircraft applications). ...

... A nanostructured winding insulation has been developed to offset the performance limit of existing micaceous insulation (Section II). Figure 1 illustrates the strategy to transform the basic research of proposed nanostructured insulation material to electric propulsion motor with game changing torque density, manufacturable by new (additive) processes [13]. The nanostructured insulation material was constructed using 2D nanoplatelets of nanoclays (talcpyrophyllite magnesium silicate) and stacked layers of nitride nanoplatelets, with each layer thickness being on the order of 1 nm, uniformly dispersed in epoxies with preferred orientation to achieve desirable characteristics of electrical discharge resistance and high thermal conduction [19,20]. Section III gives a brief description of the thermal and electromagnetic simulations and evaluates the electromagnetic and thermal performance of MV motors with nanostructured insulation material (NIM) vs micaceous insulation material (MIM). ...