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Application of Compositionally Diphasic Xerogels for Enhanced Densification: The System Al 2 O 3 ‐SiO 2
Author(s) -
Komarneni Sridhar,
Suwa Yoshiko,
Roy Rustum
Publication year - 1986
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.1151-2916.1986.tb04808.x
Subject(s) - mullite , materials science , microstructure , sintering , stoichiometry , phase (matter) , pellets , chemical engineering , composite material , mineralogy , ceramic , chemistry , organic chemistry , engineering
Stoichiometric mullite (71.38 wt% Al 2 O 3 ‐28.17 wt% SiO 2 ) and 80 wt% Al 2 O 3 ‐20 wt% SiO 2 gels were prepared by the single‐phase and/or diphasic routes. Dense sintered bodies were prepared from both sets of gels in the Al 2 O 3 ‐SiO 2 system. Apparent densities of 96% and 97% of theoretical density were measured for the diphasic (using two sols) mullite samples sintered at 1200° and 1300°C for 100 min, respectively; this compared with 85% and 94% for the single‐phase xerogels under the same conditions, and to much lower values for mullite prepared from conventional mixed powders. The microstructure of the mullite pellets from diphasic xerogel precursors is also considerably finer.