Abstract
SiC fiber reinforced SiC composites with Al2O3 interface layers were fabricated by filament winding method and PIP method. α-Al2O3 powder, γ-Al2O3 powder and Aluminum triisopropoxide were coated on the surface of SiC fiber as interface layer between fiber and matrix. The coated fiber was infiltrated in suspension composed with SiC powder and polycarbosilane/hexane solution, and wound as sheet shape. Green body was formed with these sheets. Composite was synthesized by heat treatment of the green body at 1473 K for 1.8 ks in Ar atmosphere. The composite showed typical non-brittle fracture manner and large work-of-fracture at room temperature. The composite with coarser Al2O3 interface layer showed slightly higher bending strength and fracture toughness. On the contrary, the composite with fibers coated by Aluminum triisopropoxide showed non-brittle manner after oxidizing at 1473 K for 50 hours.
