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Surface Texture Formation in Al 2 O 3 Substrates
Author(s) -
NAKADA Y.,
SCHOCK T. L.
Publication year - 1975
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.1151-2916.1975.tb19010.x
Subject(s) - sintering , texture (cosmology) , materials science , surface energy , atmosphere (unit) , grain growth , substrate (aquarium) , impurity , adsorption , microstructure , crystallography , composite material , metallurgy , chemistry , geology , image (mathematics) , physics , oceanography , organic chemistry , artificial intelligence , computer science , thermodynamics
Crystallographic texture formed at the surface during the sintering of 3 tape‐cast Al 2 O 3 substrates was studied as a function of sintering temperature and atmosphere. The sintering atmosphere strongly influenced the surface texture formed. A strong (001) basal‐plane fiber texture normal to the plane of the substrate is produced when commercial green substrates are sintered in air at 1600° to 1700°C; sintering in vacuum (< 2 × 10 ‐6 mm Hg) or dry H 2 produces a weaker texture. Grain growth is a necessary but insufficient condition for the formation of a strong surface texture. It is proposed that surface texture formation is caused by an excess driving force which results in growth of grains with a low‐surface‐energy plane exposed at the substrate surface. Since the surface energy of a crystallographic plane is a function of atmosphere and impurities adsorbed on the surface, both these factors should have a pronounced effect on surface texture formation, as observed in the present study.