Effect of a BN Interphase that Debounds Between the Interphase and the Matrix in SiC/SiC Composites

摘要

Typically, the debonding and sliding interface enabling fiber pullout for silicon-carbide fiber-reinforced silicon-carbide matrix composites with BN-based interphases occurs between the fiber and the interphase. Recently, composites have been fabricated where interface debonding and sliding occurs between the BN interphase and the matrix. This results in two major improvements in mechanical properties. First, significantly higher failure strains were attained due to the lower interfacial shear strength with no real loss in ultimate strength properties of the composites.