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Interface‐Reaction‐Controlled Kinetics in the Hot Isostatic Pressing of Submicrometer Alumina Powder
Author(s) -
Wills Roger R.,
McCoy John Kevin
Publication year - 1985
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.1151-2916.1985.tb15304.x
Subject(s) - dilatometer , materials science , hot isostatic pressing , kinetics , pressing , composite material , grain boundary , hot pressing , sintering , mineralogy , metallurgy , microstructure , thermal expansion , chemistry , physics , quantum mechanics
The kinetics of densification of alumina powder compacts at 1000° to 1200°C were studied by using a dilatometer to monitor volumetric changes during hot isostatic pressing. The densification rate is proportional to the square of the applied pressure, and densification does not occur below a threshold pressure. Results are interpreted in terms of an interface‐controlled reaction mechanism involving the movement of grain‐boundary dislocations.