Study On Winding Process And Performance Of Carbon Fiber/cyanate Ester Resin Composite

With high specific strength, high specific modulus, excellent dimensional stability and good spatial irradiation resistance, carbon fiber/cyanate ester resin composite accords with the development trend of aviation material. So far, this kind of material has been extensively studied in foreign countries and widely used in aerospace field. The research on the composite is lagging behind in our country, in this case, it is necessary to study the molding technology of carbon fiber/cyanate ester resin composite.To determine the wet winding temperature and viscosity of the resin matrix, the rheological behavior of cyanate ester resin were studied by the rotational rheometer, its viscosity and applicable period at different temperatures were measured. The curing behavior and glass transition temperature of the resin matrix were studied by differential scanning calorimetry(DSC) and dynamic thermal mechanical analyzer(DMA), and the curing system of the resin and its composite was determined: heating 2h at 120℃, heating 2h at 160℃, heating 2h at 180℃, heating 2h at 220℃, heating 2h at 240℃. In addition, according to the national standard, the mechanical properties of cyanate ester resin casting body were characterized, showing good comprehensive performance.The wettability of carbon fiber/cyanate ester resin system was studied by dynamic contact angle, and the surface energy of carbon fiber was measured with OWRK method. The results showed that these three kinds of carbon fiber T700, T800 and M55 JB could be well infiltrated with the cyanate resin. The total surface energy of the three carbon fibers varied little, but the component varied from each other, especially the polar component of M55 JB was only 6.41 m J/m2, indicating its stong surface inertia. To study the interfacial properties of the composite, the interfacial shear strength of it was determined with the micro debonding method. The unidirectional carbon fiber/cyanate ester resin composite plate was prepared by filament winding. And its mechanical properties were tested, thus the basic properties of the composite were obtained.Aiming at reducing the weight of composite rod, this paper adopted the method with laying the inner grid to reduce weight as well as increase the structural stiffness as far as possible. And its performance was calculated by the finite element analysis, the tensile stiffness was 4.1×107N/m, the torsional stiffness was 2.54×105N·m/rad, the bending stiffness was 2.51×105N·m/rad. All the results could reach the design requirements. The selection of gypsum and the ratio of gypsum to water were studied, and finally the gypsum grid mold was prepared successfully by casting molding method with the quick drying gypsum and the ratio of gypsum to water 125:85. The carbon fiber/cyanate ester resin composite rod was formed by wet winding, and its performances were characterized. The torsional stiffness and the bending stiffness was 2.53×105N·m/rad, 2.51×105N·m/rad, respectively. And the results coincided with the finite element analysis.