Effect of crystallization of grain boundary phase on the high temperature strength of silicon nitride ceramics. Final report, April 1, 1980-March 31, 1984. [Sialon-YAG; Sialon-cordierite]
Technical Report
·
OSTI ID:6916733
Grain growth kinetics of SIALON grains during hot pressing were studied. Microchemical analysis work has also been carried out. The decrease of K/sub IC/ value with and increasing amount of YAG in the annealed specimens in the system SIALON-YAG can be attributed to the higher thermal expansion coefficient of the YAG than that of the SIALON crystals. The YAG crystals at the grain boundaries which crystallized at high temperatures during annealing contracted more than the SIALON grains during cooling and tension were generated at the interfaces. Cordierite has a lower thermal expansion coefficient than that of the SIALON crystals. The system SIALON-cordierite was then studied. It was found that the toughness of the ceramics in the system SIALON-cordierite increased upon annealing treatments. Bulk glasses in the system SIALON-cordierite were also prepared. The glass formation and crystallization behavior in this system were studied. The results of the above studies are reported in the following sections: the microchemical analysis of the grain and grain boundary phases in the system SIALON-YAG; grain growth kinetics of ..beta.. grains in the system SIALON-YAG; high temperature mechanical property measurements; the system SIALON-cordierite; and glass formation in the system SIALON-cordierite.
- Research Organization:
- Michigan Univ., Ann Arbor (USA). Dept. of Materials and Metallurgical Engineering
- DOE Contract Number:
- AC02-80ER10619
- OSTI ID:
- 6916733
- Report Number(s):
- DOE/ER/10619-T1; ON: DE84011786
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALUMINATES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
GARNETS
GLASS
GRAIN GROWTH
GRAIN SIZE
KINETICS
MICROSCOPY
MICROSTRUCTURE
MINERALS
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SILICON NITRIDES
SIZE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALUMINATES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
GARNETS
GLASS
GRAIN GROWTH
GRAIN SIZE
KINETICS
MICROSCOPY
MICROSTRUCTURE
MINERALS
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SILICON NITRIDES
SIZE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS