ISSUES IN THE CONTROL OF FIBER-MATRIX INTERFACES IN CERAMIC COMPOSITES

It is argued that virtually all ceramic-matrix composite parts will be at least locally microcracked in service, such that engineered, oxida tion-resistant interfaces are a pervasive requirement. In addition, th ere is a host of complex parameters which affect interfacial propertie s. This work presents theoretical and experimental work examining the role of interface topography. Fiber push-out tests and an analysis of the test which includes an interface roughness contribution are descri bed. Techniques for characterizing fiber/interface topography are desc ribed and results presented. Finally, interface degradation associated with fiber sliding is described.