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Possible Explanations of Transient Neck Formation between Pairs of (100) Faceted Particles
Author(s) -
Searcy Alan W.,
Billiard Jeffrey W.,
Carter W. Craig
Publication year - 1996
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.1151-2916.1996.tb08995.x
Subject(s) - transient (computer programming) , materials science , shrinkage , carbon fibers , substrate (aquarium) , enhanced data rates for gsm evolution , sintering , composite material , geology , telecommunications , oceanography , composite number , computer science , operating system
Rankin and Boatner have observed that (100) faceted MgO particles in contact along either corners or edges developed, on heating, necks that initially grew, but then shrank and broke. General thermodynamic models are provided that predict this transient neck formation for any cubic particles that share only a small fraction of an edge and for particles that share an edge that is less than 0.6 times as long as the orthogonal edges. A third model, which assumes that reaction of MgO particles with their carbon substrate removes MgO from the MgO–carbon interface at a constant rate, explains the observation that the neck shrinkage rate greatly exceeds the neck growth rate. Application of the theory to explaining the seeming prevalence of rounded surfaces in sintering powders is described.