Abstract
The evolution of micro-morphology and physical properties of Cf/SiC-Al composites prepared by precursor impregnation and pyrolysis (PIP) and high-temperature pressure infiltration processes after high-temperature oxidation (300–700 °C) was investigated. Nanoindentation method was used to characterize the hardness and elastic modulus of each component of the composites. The results demonstrated that with the increased of the oxidation temperature, the weight loss rate of the composites gradually increased, and in-plane compressive strength decreases gradually. The composites showed significant oxidation damage after the oxidation temperature exceeded 500 °C, and the nanoindentation hardness and elastic modulus of the Al alloy matrix were significantly reduced. After the oxidation treatment at 700 °C, the Al alloy matrix in the composites even melted and flowed out. The oxidative damage and compression fracture failure mechanisms of the composites after oxidation were also further discussed and analyzed.
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