Preparation, characterization and annealing behavior of Al2O3 coating on quartz fiber fabric in aqueous solution near room temperature

Quartz fiber fabric has been widely used in national defense, military, aerospace industries due to its good high temperature resistance, chemical stability, and excellent thermal shock resistance. However, tendency of thermal degradation due to crystallization at high temperature may destroy the high temperature performance of the quartz fiber fabric, especially its high temperature mechanical property. In this study, Al2O3 ceramic coating was synthesized on the surface of 2D quartz fiber fabric in aqueous solution near room temperature. Surface morphology and chemical composition were studied to evaluate the quality of the coating by SEM, AFM, XPS and FT-IR. The annealing behavior at high temperature was evaluated by electronic universal testing machine after high temperature processing. Al2O3 coating could improve its annealing behavior effectively. The maximum load that the coated fabric can bear was 2.5 times as higher as that of the original fabric, proving the superior high temperature mechanical property of the coated fabric. The coating on the surface of the fiber could block the damage of the high temperature to the quartz fiber, improving the crystallization phenomenon of the quartz fiber at high temperature, followed by the improve in the high temperature mechanical property of the fabric.