Microstructural transformations and Grain growth in alumina nanoprecursors

Abstract

Alumina nanoprecursors with a range of average particle size and narrow distribution manifested two different grain and pore growth during mictrostructural developments. Densification temperature decreases in general with the decrease in average particle size though the distribution of particle size as a function of heating rate manifested different grain growth and subsequent densification. At low heating rate, 5^oC the particles tend to show bimodal grain growth with bigger average grain, about 3 micron and densified at elevated temperatures, 1600^oC. While at ten times elevated heating rate, 50^sC, the particles tend to show normal grain growth with desirable average grain, 1bout 1 micron and densified at comparatively 200^oC degrees lower temperature.

Keywords:Alumina, densification, grain growth, pore closure.

DOI: 10.7176/CMR/14-4-04

Publication date:November 30^th, 2022