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Grain Growth During Hot Isostatic Pressing of Presintered Alumina
Author(s) -
Uematsu Keizo,
Itakura Kazuhisa,
Sekiguchi Masahiko,
Uchida Nozomu,
Saito Katuichi,
Miyamoto Akira
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.tb09714.x
Subject(s) - hot isostatic pressing , materials science , grain growth , microstructure , metallurgy , grain boundary , porosity , diffusion , pressing , grain size , sintering , grain boundary diffusion coefficient , aluminium , composite material , physics , thermodynamics
Grain growth during hot isostatic pressing is examined at 1373 to 1673 K at 5 to 200 MPa for 0.5 to 4 h on alumina presintered at 1723 to 1873 K. A linear relation is found between logarithms of grain size and porosity. To account for this result, the development of similar microstructures is suggested regardless of the histories of the starting powder and process. Temperature dependences of grain growth and densification must also be equal during hot isostatic pressing. Both grain growth and densification were controlled by the grain‐boundary diffusion of the aluminum ions.