Premium
Critical Factors in the Templated Grain Growth of Textured Reaction‐Bonded Alumina
Author(s) -
Suvaci Ender,
Messing Gary L.
Publication year - 2000
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.1151-2916.2000.tb01509.x
Subject(s) - materials science , grain growth , template , texture (cosmology) , ceramic , pressing , chemical engineering , template method pattern , grain size , crystallography , composite material , nanotechnology , chemistry , computer science , image (mathematics) , artificial intelligence , engineering
The Templated Grain Growth (TGG) of Al 2 O 3 occurs in three stages: densification, radial growth of individual template grains until template impingement, and template grain thickening. Significant template growth occurs only after densification to ∼90% density. Template loading determines the inter‐template spacing and, subsequently, the degree of growth. The spacing distance can be predicted from the initial template concentration and template dimensions. Thermodynamic conditions favorable for template growth occur when the size ratio between the template thickness and matrix grains is ≥1.5. The initial template concentration should be less than a critical template concentration, V T,C , to achieve textured ceramics with a narrow orientation distribution. For this system, which uses 20 ± 5 μm × 2 μm template particles and uniaxial pressing as a forming technique, V T,C is between 5 and 10 vol%.