Microstructure and mechanical properties improvement of the NextelTM 610 fiber reinforced alumina composite

摘要

The alumina slurry with high solid content was prepared, and a rapid lamination route for fabricate the NextelTM 610 fiber reinforced alumina composite was proposed in this work. The microstructure and mechanical properties of the as-received all-oxide composite were investigated by a series of techniques. The shrinkage cracks in matrix were reduced, while porous structure in composite was maintained. The N610/alumina composite has weak matrix and weak interface, as the Young's modulus of the alumina matrix and the interfacial shear strength of the composite are 140.8 +/- 2.5GPa and 129.1 +/- 14.6MPa. The mechanical properties of the composite are much higher than lots of oxide/oxide composites, given its flexural strength, interlaminar shear strength and the fracture toughness are 398.4 +/- 5.7MPa.27.0 +/- 0.5MPa and 14.1 +/- 0.9MPa.m1/2, respectively. The flexural strength of the virgin composite keep stable at 25-1050 degrees C, while dramatically decrease at 1100-1200 degrees C.