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Influence of Water Vapor on the Hot‐Pressing Kinetics of MgO
Author(s) -
SHELLEY ROBERT D.,
NICHOLSON PATRICK S.
Publication year - 1971
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.1151-2916.1971.tb12323.x
Subject(s) - brucite , materials science , water vapor , dehydration , kinetics , hot pressing , fluidized bed , vapour pressure of water , particle size , pressing , particle (ecology) , chemical engineering , composite material , vapor pressure , mineralogy , metallurgy , chemistry , organic chemistry , magnesium , biochemistry , physics , oceanography , quantum mechanics , engineering , geology
MgO powder containing 0, 3, 5, and 10% attached H 2 O was hot‐pressed at 1150°C and 4000 psi. An enhanced densification rate was observed initially in the water‐containing powders, the degree of enhancement being proportional to the water percentage. Water vapor retarded the final stages of densification. Densification differences were noted between the as‐received material (5% H 2 O) and the “dry” powder + brucite mixtures (3 and 10% H 2 O). Weight loss determinations associated these differences with the dehydration characteristics of the as‐received powder and brucite. Initial enhancement was associated with “fluidized bed” particle rearrangement and final retardation with trapped water‐vapor back pressure. A final back pressure value of 1500 psi was calculated based on current hot‐pressing models.