Premium
Microstructural Studies of the Interfacial Zone of a SiC‐Fiber‐Reinforced Lithium Aluminum Silicate Glass‐Ceramic
Author(s) -
Bischoff Ewald,
Rühle Manfred,
Sbaizero Orfeo,
Evans Anthony G.
Publication year - 1989
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.1151-2916.1989.tb06210.x
Subject(s) - materials science , amorphous solid , carbide , lithium (medication) , composite material , silicate , ceramic , aluminium , transmission electron microscopy , layer (electronics) , aluminium silicate , composite number , thermal treatment , diffusion , mineralogy , chemical engineering , crystallography , nanotechnology , chemistry , physics , thermodynamics , medicine , engineering , endocrinology
Transmission electron microscopy studies have been conducted on interfaces in a lithium aluminum silicate/SiC‐fiberreinforced composite. In the as‐processed state, interphases of amorphous C and carbides of Nb have been confirmed, with circumferential thermal debonds evident in the C layer. After heat treatment in air at 800°C, the C is found to be replaced by amorphous SiO 2 , and the carbides of Nb replaced by oxides. The SiO 2 thickens with exposure time and typically contains circumferential separations. Some Mg and Al diffusion also accompanies the heat‐treatment process and eventually leads to the formation of MgO and Mg silicates in the interfacial zone.