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Application of computer methods for calculation of multicomponent phase diagrams of high-temperature structural ceramics. Final report, August 1984-July 1987

Technical Report ·
OSTI ID:5923680
A data base is being developed for calculation of quasi-binary and quasi-ternary phase diagrams of ceramic systems. Previous segments of this base cover combinations of Cr/sub 2/O/sub 3/, MgO, A1/sub 2/O/sub 3/, SiO/sub 2/, CaO, Si/sub 3/N/sub 4/, A1N, BeO, Y/sub 2/O/sub 3/ and Ce/sub 2/O/sub 3/. Sixty -six quasi binary and nineteen quasi ternary systems have been calculated. Current work extends the base to cover GeO/sub 2/, HfO3, ZrO/sub 2/ and TiO/sub 2/ which are of interest in applications requiring toughness and structural performance at high temperatures. This has been effected by employing available source of thermochemical and phase-diagram data. Recently it has been shown that by alloying GeO/sub 2/ with SiO/sub 2/ a whole range of glasses can be synthesized with tailor-made coefficients of expansion. Utilization of such compositions offers the possibility of enhancing the high temperature oxidation resistance of ceramic composites in which a mixed GeO/sub 2/-SiO/sub 2/ phase which a desired CTE would replace the conventional SiO/sub 2/ as a filler.
Research Organization:
Manlabs, Inc., Cambridge, MA (USA)
OSTI ID:
5923680
Report Number(s):
AD-A-183174/2/XAB
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360602 -- Other Materials-- Structure & Phase Studies
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM NITRIDES
ALUMINIUM OXIDES
BERYLLIUM COMPOUNDS
BERYLLIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBON COMPOUNDS
CERAMICS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COMPOSITE MATERIALS
COMPUTER CALCULATIONS
DIAGRAMS
EXPANSION
GERMANIUM COMPOUNDS
GERMANIUM OXIDES
GLASS
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
HEAT RESISTANT MATERIALS
HIGH TEMPERATURE
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PNICTIDES
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SILICON COMPOUNDS
SILICON NITRIDES
SILICON OXIDES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES