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Preferred Orientation in Al 2 O 3 Substrates
Author(s) -
DiMARCELLO F. V.,
KEY P. L.,
WILLIAMS J. C.
Publication year - 1972
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.1151-2916.1972.tb13418.x
Subject(s) - texture (cosmology) , crystallite , basal plane , materials science , substrate (aquarium) , orientation (vector space) , composite material , flexural strength , plane (geometry) , crystallography , geometry , chemistry , metallurgy , mathematics , geology , computer science , artificial intelligence , oceanography , image (mathematics)
The degree of preferred orientation (texture) of doctor‐bladed polycrystalline 99.5% Al 2 O 3 substrates from 3 sources was evaluated by qualitative optical and quantitative X‐ray analyses. The substrates exhibit a fiber texture in which the basal planes lie preferentially in the plane of the substrate. The same texture is weakly evident in the unfired materials. The strength of the texture in fired substrates varies from lot to lot and among suppliers, but its character remains essentially the same. Measurements of dielectric constant, flexural strength, and thermal expansivity are consistent with the observed texture. The possible origins of the texture and its importance in substrate applications are discussed.