Microstructure and mechanical properties of an oxide/oxide ceramic matrix composite using a sol-based slurry
Yuelin Zhang, Xun Sun, Ru Jiang, Haitao Liu, Yanfeng Jiang
Abstract
In this work, an oxide fiber-reinforced oxide matrix (oxide/oxide) composite was fabricated by a lamination process using a sol-based slurry. The density and the porosity of the oxide/oxide composite was 2.72 g/cm 3 and 32.5%, respectively. The oxide matrix had a porous microstructure, and its elastic modulus was much lower than that of the oxide fiber. The as-received composite had a high flexural strength of 280.6 ± 9.3 MPa, a high interlaminar shear strength of 18.1 ± 0.7 MPa and a high fracture toughness of 7.6 ± 0.6 MPa m 1/2 . Fiber pull-out and crack deflection during fracture process were observed. The high elastic modulus ratio of fiber to matrix is critical to trigger toughening mechanisms of the composite.