| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
| Presentation Title |
Sintering, Structure, and Properties of Y<sub>2</sub>O<sub>3</sub>-ZrO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Core-Shell Nanocomposite Ceramics |
| Author(s) |
Kevin P. Anderson, Benjamin L Greenberg, Mason A Wolak, James A Wollmershauser, Boris N Feigelson |
| On-Site Speaker (Planned) |
Kevin P. Anderson |
| Abstract Scope |
Composite materials embody the pursuit of synergy in materials, an effort to retain the desirable properties of constituents while compensating for their shortcomings. To this end, core-shell based structures represent highly uniform and intimate composites which could be tailored through core and shell customization. Additionally, nanoscale core-shell based composites could exploit size-dependent effects such as the Hall-Petch effect for additional property enhancements. Using Y<sub>2</sub>O<sub>3</sub>-ZrO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> as a model system, the effects of grain size and shell thickness on core/shell integrity and mechanical properties were investigated. Core-shell powders were produced through particle atomic layer deposition (pALD), then sintered using the Environmentally Controlled – Pressure Assisted Sintering (EC-PAS) approach. EC-PAS utilizes the creation and preservation of pristine nanoparticle surfaces throughout the sintering process, applied pressure (<2 GPa), and low temperature (< 0.5 T<sub>m</sub>) to achieve densification with negligible grain growth. Core-shell powders and nanocomposites were characterized with XRD, SEM, and Vickers microindentation. |