Preparation and dynamic mechanical properties of boron carbide andorganosilicon two-dimensional laminated composites

The development of science and technology has put forward higher and higher requirements for material properties. It is an effective way to achieve the best performance in a specific direction by ordering the internal structure of materials. However, the traditional one-way freezing technology cannot achieve the preparation of two-dimensional ordered structure. B₄C layered scaffolds with single orientation were prepared by bidirectional freezing method. The layered scaffolds were filled with polydimethylsiloxane (PDMS) to prepare the two-dimensional layered boron carbide and organosilicate composites with anisotropy. There is an alternate arrangement structure of PDMS and B₄C skeleton at the growth plane of A in the composite material. It is a stacked structure like ocean waves at the growth plane of B. The layered scaffold maintains an obvious two-dimensional ordered layered structure in the composite material. The maximum in-plane anisotropy ratio of dynamic modulus of the composite can reach 12.9, and the dynamic modulus shows obvious Payne effect. It provides some new methods and ideas for the preparation of anisotropic composite material systems.