MICROCRACKS REDUCTION IN HIGH-TEMPERATURE MATERIALS THROUGH FIBRE/MATRIX DECOUPLING

摘要

Recent high-temperature materials manufacturers have been turning their attentions to silicon carbide composites reinforced by silicon carbide fibers (SiC/SiCf composites) as their favourite material selection due to their high toughness and damage tolerance. Even so, the mechanical behavior of ceramic matrix composites (CMCs) relies highly on the properties of its intermediate-layers between a fiber and a matrix or its interphase. Therefore, this would require current CMCs to have a weak and environmentally protective interphase. The best interphase material suggested for SiC/SiCf composites would consist of a layered structure, whereby the layers are parallel to the fiber's surface, weakly bonded to each other, but powerfully adherent to fibers.