Premium
Faceting Behavior of Alumina in the Presence of a Glass
Author(s) -
Simpson Yonn K.,
Carter C. Barry
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb07603.x
Subject(s) - faceting , materials science , grain boundary , microstructure , crystallite , sintering , phase (matter) , transmission electron microscopy , grain growth , composite material , condensed matter physics , crystallography , metallurgy , nanotechnology , chemistry , organic chemistry , physics
The faceting of alumina interfaces in the presence of a glass affects both grain growth and grain‐boundary mobility during liquid‐phase sintering. The geometry and movement of facets that form during this sintering process are expected to play an essential role in the development of the final microstructure, in particular, by their influence on the topology of the grain boundaries which ultimately control the properties of Al 2 O 3 compacts. A new method for studying the interaction between Al 2 O 3 and a glass has been developed. A thin sample of Al 2 O 3 suitable for examination in a transmission electron microscope is prepared and examined and then reacted with SiO 2 and CaO via the vapor phase. This experimental approach allows the faceting behavior of glass/Al 2 O 3 interfaces to be studied systematically without introducing unnecessary complications during subsequent sample preparation. Faceting occurs almost exclusively on the (0001) and {1 1 02} planes. The interaction between glass and certain structured grain boundaries in alumina has been studied using polycrystalline thin films.