High Temperature Mechanical Property of Al2O3 Coated Quartz-fiber Reinforced Methyl Silicon Resin Composites

摘要

In the present work, Al2O3 was coated on the quartz fiber by the sol-gel method to improve the high temperature mechanical properties of the quartz fiber/methyl silicon resin composites. The X-ray diffraction results showed that the crystalline property of the Al_2O_3 coating increased with the processing temperature. Before 500°C treated, the Al_2O_3 coated fiber reinforced composites have lower flexural strength than the commercial fiber reinforced one. While after 500°C treated, the flexural strength of Al_2O_3 coated fiber reinforced composites was higher than the uncoated reinforced one. And the flexural strength for the 400°C treated Al_2O_3 coated fiber reinforced composites was higher than that of the 600°C treated one. The mechanism of the crack propagation in the purchased and Al_2O_3 coated fiber reinforced composites was also studied through scanning electronic microscopy (SEM).