Effect of Boron Nitride Coating on Fiber-Matrix Interactions

Abstract

Coatings can modify fiber-matrix reactions and, hence, interfacial bond strengths. Commercial mullite, SiC, and carbon fibers or fabrics were coated, with boron nitride via low-pressure chemical vapor deposition, and incorporated into a mullite matrix by hot-pressing. The influence of fiber-matrix interactions for uncoated and BN-coated fibers on fracture morphologies was studied. These observations were related to the measured values of interfacial shear strengths.