Interfacial studies of refractory glass-ceramic matrix/advanced SiC fiber-reinforced composites. Annual report, 1 Feb 90-1 Feb 91

Technical Report · Tue Apr 30 04:00:00 EDT 1991

OSTI ID:5170843

Brennan, J J

The main objective of this program is to characterize the chemistry and structure and microstructure of new advanced small diameter SiC type fibers and how these factors influence the nature of the fiber/matrix interface in refractory glass-ceramic matrix composites. It is the nature of this interface that then determines to a great degree the composite thermal, environmental, and mechanical properties. The fibers under investigation included new experimental polymer derived crystalline SiC fibers as well as the new commercially available low oxygen Lox M Tyranno SiC type fibers. It was found that the mechanical properties of Lox M Tyranno fiber/LAS (lithium aluminosilicate) and BMAS (barium-magnesium aluminosilicate) metal matrix composites were much improved over similar composite materials fabricated with older higher oxygen content Tyranno fibers. An approximately 500 A thick carbon rich fiber/matrix interfacial layer was found to form during the composite fabrication, similar to that found to comparable NICALON fiber composites except for the additional formation of titanium rich crystalline particles within or near the carbon rich layer. The thermal properties and mechanical properties of both LAS and BMAS matrix composites were very similar for either Lox M Tyranno or NICALON fiber reinforcement.

• Research Organization: United Technologies Research Center, East Hartford, CT (United States)
• OSTI ID: 5170843
• Report Number(s): AD-A-236212/7/XAB; UTRC/R--91-918246-2; CNN: F33615-89-C-5628
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
CARBIDES
CARBON COMPOUNDS
CERAMICS
CHEMICAL BONDS
CHEMISTRY
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
ELEMENTS
EVALUATION
FIBERS
GLASS
INTERFACES
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NONMETALS
OXYGEN
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS