Characterization of nano-sized ?-Al2O3 compacts prepared by Modified θ-Al2O3@PEG technology

Abstract

Modified θ-Al2O3@PEG powders were prepared by mixing θ-Al2O3 powders with PEG so as to form a 2nm thickness PEG coating on the θ-Al2O3 particles The core-shell powder was used to prepare nano-sized ?-Al2O3 compacts The presence of PEG in θ-Al2O3 compacts provided the function to fabricate a compact in which the original θ-Al2O3 particles would be apart individually The ?-Al2O3 compacts then were achieved by subsequent thermal treatments following the size character that occurs to ?-Al2O3 during θ- to ?- Al2O3 phase transformation The ?-Al2O3 compacts thus obtained possess of phase purity 70-80% ?-Al2O3 crystallite size 50-100nm in diameter and relative density > 60 % of T D

Date of Award	2020
Original language	English
Supervisor	Hsing-I Hsiang (Supervisor)