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Thermal Evolution and Sintering Behavior of a 2:1 Mullite Gel
Author(s) -
Osendi Maria Isabel,
Miranzo Pilar
Publication year - 1997
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.1151-2916.1997.tb03018.x
Subject(s) - mullite , corundum , materials science , sintering , microstructure , atmospheric temperature range , mineralogy , thermal , thermal treatment , sol gel , composite material , chemical engineering , ceramic , chemistry , thermodynamics , nanotechnology , physics , engineering
The thermal evolution of a mullite gel of composition 2Al 2 O 3 ·SiO 2 has been investigated. The gel crystallized at 1300°C into an alumina‐rich mullite and corundum, instead of single‐phase 2Al 2 O 3 ·SiO 2 mullite. The amount of Al 2 O 3 that dissolved in the mullite structure has been determined in the 1300–1780°C temperature range by measuring the mullite lattice parameters. A maximum limit for the amount of Al 2 O 3 in solid solution has been observed. Densification of the gel powders has been analyzed up to temperatures of 1780°C. The microstructure of dense materials always showed the presence of residual Al 2 O 3 particles.