Interfacial Studies of Refractory Glass-Ceramic Matrix/Advanced SiC FiberReinforced Composites

摘要

The main objective of this program was to characterize the chemistry andstructure of new advanced small diameter silicon based fibers and determine 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 during the course of this program included the lower oxygen Lox M Tyranno SiC fibers from Ube Industries, polymer derived crystalline SiC fibers from Dow Corning Corp., the Si-N-C-O 'Black' fibers from Textron Specialty Materials, low oxygen SiC fibers from the Univ. of Fla., as well as the new low oxygen radiation cured Nicalon SiC type fibers from Nippon Carbon Co. Since the availability of all of these fibers was extremely limited, emphasis was placed on the mechanical, chemical, and microstructural characterization of the fibers through tensile testing, SEM of fiber fracture characteristics, scanning Auger depth profiling of fiber surfaces, and TEM of fiber thin sections, as well as their fracture behavior, bonding characteristics, and interfacial compatibility with various glass-ceramic matrix materials. Results of these analyses are discussed.... Crystalline SiC fibers, Textron 'Black' fibers, Lox M Tyranno SiC fibers, Low oxygen Nicalon fibers, Univ. of Fla. SiC fibers, SiC fiber/glass-ceramic matrix interfaces, TEM Fiber analyses.