Investigation Of Preparation And Properties For 3D Orthogonal Woven Basalt/carbon Hybrid Composites

In the large family of composites,composites made of reinforcing fibers and resin matrix are the most basic composites,so fiber composites are the mainstream of the current structural applications.There are so many kinds of composite forms of fibers and resins,and the high-performance composite materials are mostly used continuous fiber reinforced laminated composites.Laminated composite layers are constrained only by the resin between the layers,resulting in low strength in the Z-direction and delamination when loaded.Due to the restraint of the Z-direction yarn between the three-dimensional orthogonal composite layers and the layers,the material stability,interlayer performance,impact resistance and uniformity of strength in all directions are improved.in addition,the defects of the traditional layers and composite materials are overcome.Basalt fiber has excellent physical and chemical properties,such as corrosion resistance,electrical insulation,thermal stability good compatibility with the material,and very cost-effective,which fully meets the performance requirements of composite reinforcements,so the application of basalt fiber is increasing.In some engineering fields,basalt fibers has been gradually replaced glass fiber,aramid fiber and other reinforcing fibers.Carbon fiber has many excellent properties,but some properties are also flawed,such as poor impact resistance,small elongation at break,low shear modulus,these defects limit its scope of application.If the two kinds of fibers are mixed,the advantages of the two kinds of fiber composite materials can be comprehensively utilized,and the hybrid composite material with good overall performance can be obtained by taking advantage of each other.Through the material design and structural analysis of basalt fiber/carbon fiber mixed structure,the structural parameters of basalt/carbon fiber hybrid three-dimensional orthogonal fabric have been determined,and five different hybrid structures have been designed.The basic specifications and tensile properties of thewoven hybrid fabrics are tested and analyzed.It was found that the hybrid fabrics can effectively improve the strength and toughness of the fabric,when the hybrid ratio is 25%.Vacuum assisted resin transfer molding(VARTM)of the hybrid composite is studied.VARTM process parameters have an important impact on the properties of composite materials,a reasonable choice of process parameters and resin distribution system can reduce the microscopic defects of parts,so that the composite material performance is greatly improved.In the process of fabricating three-dimensional orthogonal fabric composite,the influence of vacuum degree,filling temperature and filling time on the interlaminar shear properties have been studied.Some experimental data are also tested.VARTM final process to determine the degree of vacuum used-0.1MPa,filling temperature of 30?,filling time of 8min.The properties of composites with 5 different hybrid structures are studied.The properties of different hybrid composite materials are analyzed comprehensively,the tensile strength and tensile modulus of 2BF reinforced vinyl ester resin matrix composites are slightly weaker than those of 1BF,and the flexural strength and impact strength are better than those of other hybrid composites.the mechanical properties of mixed fabric 50% reinforced vinyl ester resin matrix are better than those of several other hybrid composites.