Quartz Fiber Surface Treatment And Properties Of 2.5D Woven Composites

The quartz fiber is a kind of high performance inorganic glass fiber with SiO2 content as high as 99.95%.Due to its excellent mechanical properties,optical properties and dielectric properties,it is widely used in aerospace,defense and military,and one of its applications is reinforcing material of textile composites radome.Because of its low cost and excellent mechanical properties,2.5D quartz fiber woven composites have gradually become the preferred material for the radome.But in the production of quartz fiber,in order to maintain the cluster of the fiber to make it easy to braiding,it is necessary to apply soaking agent on the fiber surface,resulting in poor adhesion and wettability to the resin matrix as the reinforcements,thus causing the failure of composite materials to give full play to the mechanical properties of quartz fibers.Therefore,it is of great significance to improve the interfacial properties of the composites by surface treatment of fiber.In this paper,acid etching and high temperature method were used to treat the surface of quartz fiber.The weight loss,appearance,morphology,mechanical properties and surface energy of the fibers were compared before and after treatment.The 2.5D angle interlock structural parameters were rationally designed,and the preforms were successfully woven on the loom.RTM molding technology was used to fabricate 2.5D quartz fiber woven composites before and after processing,and tensile properties,bending and interlaminar shear tests were carried out.The effects of surface treatment on the mechanical properties of composites were analyzed and evaluated from the macro and micro aspects.The tensile and flexural properties of composites were simulated and analyzed by finite element method based on ABAQUS.At the same time,the high temperature resistance of the composite was studied.The experimental results show that after processing the mechanical properties of the quartz fiber decreased.However,the mechanical properties of the composites prepared by preprocessing of 2.5D preform have been greatly improved.It is explained that the mechanical properties of the composites are improved by the good interfacial bonding with the resin after the treatment of the fibers,and the acid etching method is the best.By comparing the experimental results with the finite element simulation,it is proved that the model is reasonable for the analysis of 2.5D angle interlocking composite,and will lay the foundation for optimizing the mechanical properties of 2.5D textile composite materials in the future.After heat treatment,it is found that high temperature can make the resin decompose,and at the same time,it can make the resin solidify,the comprehensive effect of the two influences the mechanical properties of the composite.