Premium
Densification Mechanisms in Hot–Pressing of Magnesia with a Fugitive Liquid
Author(s) -
HART PATRICK E.,
ATKIN ROBERT B.,
PASK JOSEPH A.
Publication year - 1970
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.1151-2916.1970.tb12015.x
Subject(s) - sintering , materials science , lubricant , crystallite , evaporation , liquid phase , metallurgy , grain boundary , composite material , magnesium , chemical engineering , microstructure , physics , engineering , thermodynamics
Densification of MgO with LiF additions depends on the formation of a liquid that is initially a lubricant for rearrangement of particles and later a material transport medium for pressure–enhanced liquid–phase sintering. The rate–controlling process in the latter stage is viscous flow of the liquid through grain–boundary channels. After the liquid is distributed as a uniformly thin film between the MgO grains, it can be removed by evaporation, and transparent polycrystalline specimens are produced.