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The System Al 2 O 3 ‐Cr 2 O 3 ‐Sio 2
Author(s) -
ROEDER P. L.,
GLASSER F. P.,
OSBORN E. F.
Publication year - 1968
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.1151-2916.1968.tb13328.x
Subject(s) - liquidus , cristobalite , mullite , solid solution , phase diagram , corundum , eutectic system , crystallization , isothermal process , thermodynamics , mineralogy , cordierite , phase (matter) , materials science , chemistry , metallurgy , microstructure , quartz , physics , ceramic , organic chemistry
Liquidus phase equilibrium data are presented for the system Al 2 O 3 ‐Cr 2 O 3 ‐SiO 2 . The liquidus diagram is dominated by a large, high‐temperature, two‐liquid region overlying the primary phase field of corundum solid solution. Other important features are a narrow field for mullite solid solution, a very small cristobalite field, and a ternary eutectic at 1580°C. The eutectic liquid (6Al 2 O 3 ‐ICr 2 O 3 ‐93SiO 2 ) coexists with a mullite solid solution (61Al 2 O 3 ‐10Cr 2 O 3 ‐29SiO 2 ), a corundum solid solution (19Al 2 O 3 ‐81Cr 2 O 3 ), and cristobalite (SO 2 ). Diagrams are presented to show courses of fractional crystallization, courses of equilibrium crystallization, and phase relations on isothermal planes at 1800°, 1700°, and 1575°C. Tie lines were sketched to indicate the composition of coexisting mullite and corundum solid solution phases.