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Effect of Grain Growth on Pore Coalescence During the Liquid‐Phase Sintering of MgO‐CaMgSiO 4 Systems
Author(s) -
OH UNCHOL,
CHUNG YOUNGSOO,
KIM DOHYEON,
YOON DUK N.
Publication year - 1988
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.1151-2916.1988.tb07535.x
Subject(s) - sintering , porosity , coalescence (physics) , materials science , grain growth , grain size , chemical engineering , mineralogy , composite material , chemistry , physics , astrobiology , engineering
During the liquid‐phase sintering of MgO‐CaMgSiO 4 systems in N 2 atmosphere, the total porosity and the average pore size increase while the number of pores decreases. The negligible permeability of entrapped nitrogen through the liquid matrix and the observed linear relationship between the number of pores and that of the MgO grains suggest that the pores coalesce as a consequence of grain growth during sintering. An analysis of the balance between the pressure of the entrapped N 2 gas and the capillary pressure shows that pore coalescence in turn causes the observed porosity increase. When Fe 2 O 3 or Cr 2 O 3 is added to MgO‐CaMgSiO 4 , the pore size and the total porosity become larger or smaller, because the grain growth is accelerated or retarded, respectively.