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Influence of Additives on the Microstructure of Sintered Al 2 O 3
Author(s) -
ROSSI GIULIO,
BURKE JOSEPH E.
Publication year - 1973
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.1151-2916.1973.tb12445.x
Subject(s) - grain growth , microstructure , grain boundary , materials science , coalescence (physics) , grain size , sintering , grain boundary strengthening , abnormal grain growth , mineralogy , crystallography , metallurgy , composite material , chemistry , physics , astrobiology
During an investigation to determine the effect of additives in inhibiting exaggerated grain growth, it was observed that several gave strikingly similar microstructures with pore clusters at grain centers surrounded by substantially pore‐free annular regions. A few very large pores were found at the grain boundaries and occasionally in the small‐pore‐free annular regions. The development of this structure is explained as a sequence of exaggerated grain growth followed by normal grain growth. A discontinuous grain‐boundary liquid phase facilitates the final grain‐growth step and takes part in the coalescence of fine pores into coarse pores.