36. CORRELATION BETWEEN PARTICLE SIZE AND GRAIN SIZE DISTRIBUTIONS IN SINGLE/MULTIPHASE CERAMICS

Department: Mechanical & Aerospace Engineering
Research Institute Affiliation: Agile - CaliBaja Center for Resilient Materials & Systems
Faculty Advisor(s): Olivia A. Graeve

Primary Student
Name: Keyur Karandikar
Email: kkarandi@ucsd.edu
Phone: 404-884-3419
Grad Year: 2017

Abstract
The study is aimed to obtain a better correlation between the particle size of various ceramic powders and the respective grain size of sintered specimens. Sample compositions consist of mixtures of yttria-stabilized zirconia, spinel and &#61537;-alumina powders of various nanometer/submicron particle sizes. Powders are first mixed by high-energy ball-milling and are sintered using Spark-Plasma Sintering (SPS) to obtain fine grained homogeneous nano-composites. Powder characterization is performed using Dynamic Light Scattering (DLS) by using stable colloidal suspensions obtained by Zeta-potential mapping. The sintered specimens are characterized for grain size, porosity by image analysis on Scanning Electron Microscopy (SEM) images of fractured and polished surfaces. Density (Archimedes principle) and crystallite size information (X-ray diffraction) are obtained. The study helps to understand mechanical/physical properties like microstructural evolution, densification during ceramic powder processing. Highlights include fabrication of nano-ceramics (grain size < 150nm) for the development of multiphase nano-crystalline ceramics for nuclear reactors

Industry Application Area(s)
Aerospace, Defense, Security | Energy/Clean technology | Materials

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