ProgramMaster Logo
Conference Tools for MS&T23: Materials Science & Technology
Login
Register as a New User
Help
Submit An Abstract
Propose A Symposium
Presenter/Author Tools
Organizer/Editor Tools
About this Abstract
Meeting MS&T23: Materials Science & Technology
Symposium Mesoscale Phenomena in Functional Polycrystals and Their Nanostructures
Presentation Title Hierarchical Ceramic Composites for Ultra-high Temperature Applications
Author(s) Laura Silvestroni, Nicola Gilli, Jeremy Watts, William G. Fahrenholtz
On-Site Speaker (Planned) Laura Silvestroni
Abstract Scope The latest generation UHTCs, based on a boride matrix and sintered in the presence of transition metal (TM) compounds, has demonstrated strengths beyond current benchmark ranges, with peaks of ~1 GPa at 1800°C and strengths above 600 MPa up to 2100°C. Microstructural analyses disclosed a unique multi-scale microstructural arrangement with the TM partially dissolved into the boride matrix, forming core-shell grains during sintering, and wreathed with TM-based nano-particles. This complex hierarchical microstructure, featured by several levels of spatial variations, is thought to be responsible for the elevated temperature strengthening. Subsequent studies are now considering other transition metals, like Ti, Nb, V and Cr. Here, we present how the microstructure of ZrB2-based ceramics with addition of various TM evolves from the sintering process, to oxidation at 1500°C and upon arc-jet tests. Emphasis is given to the formation of the nanoinclusions and their role on the mechanical and thermal behavior.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Acoustic Phonon Spectra Modification and Light Emission Properties of Rare Earth Doped Polycrystalline Alumina
Bidirectional Dynamic Mechanical Writing of Polar Bubbles
Causality and Machine Learning Models of Ferroics From Atomistic Simulations
Characterization of Phase and Domain Switching in Sn-doped BCZT Piezoceramics with Large Electromechanical Strains
Computer Simulation as a Tool to Optimize Electronic Conduction.
D-17: Alchemy of Graphite: The Many Faces of Coal
D-18: High-throughput Approach for Predicting Optical Properties of Crystals
D-19: Numerical Analysis of the Influence of the Second-phase Particle Morphology on the Alloy Microstructure Evolution
Enhanced Electron Transport in Metal-Carbon Composites
Heat-assisted Ferroelectric Reading for High Speed Ultrahigh-density Ferroelectric Data Storage
Hierarchical Ceramic Composites for Ultra-high Temperature Applications
Liquid Crystalline Diffractive Waveplates: Ultrathin, Planar Optics
Mesoscale Dipoles via Strain Induced Correlations in an Atomic-layer Superlattice
Modeling Local Dielectric Dispersion in Ferroelectric BaTiO3 with Domain Walls
Modeling Thermoelectric Figure of Merit in Complex Materials at Mesoscale
Optical Behavior and Electro-optic Performance in Fine Grained Lead-free Ceramics
Optical Properties of Chalcophosphate Materials in the Visible and Infrared Range
Strain-tuned Quantum Materials
Structure Property Relationships in Complex, Multi-phase, Polycrystalline Materials

Questions about ProgramMaster? Contact programming@programmaster.org