High-temperature properties of 2.5D SiO2f/SiO2 composites by sol–gel

2.5D SiO2f/SiO2 composites were fabricated by sol–gel process. The mechanical and fracture behavior of SiO2f/SiO2 composites under higher temperature were discussed. The oxidation behavior at 1200 °C and 1500 °C was investigated. The results showed that SiO2f/SiO2 composites had high flexural strength, and the fracture mechanism was a combination of brittle and ductile fracture. After higher temperature oxidation, the fracture mechanism changed to typical brittle/sudden fracture. For long time usage at higher temperature, it was necessary to stabilize SiO2 fibers and SiO2 matrix of SiO2f/SiO2 composites.