|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||2016 Functional Nanomaterials: Emerging Nanomaterials and Techniques for 3D Architectures
||3-Dimensional Nanostructures in Bulk Monolithic Solids by Enhanced High Pressure Sintering
||James A Wollmershauser, Boris N. Feigelson, Kedar Manandhar
|On-Site Speaker (Planned)
||James A Wollmershauser
Consolidating core/shell nanoparticles into 3-dimensional bulk components are theorized to bring dramatic improvements to functional properties including magnetic exchange coupling, thermoelectric energy conversion, and mechanical response. However, these improvements are generally only expected when porosity is negligible and the microstructural length scales are well below 100nm, which is a technological challenge. NRL has recently developed an Enhanced High Pressure Sintering approach to consolidate oxide, metal, and semiconductor nanoparticles into dense 3-dimensional nanostructured materials. EHPS incorporates stringent environmental control and utilizes high pressures to break agglomerates while simultaneously exploiting the increased surface potential of pristine nanoparticles for surface-energy-driven densification without microstructural changes. Using this approach, fully-dense nanocrystalline ceramics with grain sizes <30nm are shown to exhibit an increase in hardness over their microcrystalline counterparts. When used in conjunction with particle atomic layer deposition to create core/shell particle building blocks, EHPS techniques produce nanocomposite ceramics which demonstrate further increased hardness and toughness.