Study On The Self-Healing And Transparent Characteristics Of Coaxial Printed Silicate Composites

Silicate-based materials are the most widely used and abundant engineering materials in the world.Extensive research has focused on developing environmentally friendly and multifunctional properties with low energy consumption and intelligence for over two hundred years.However,their high brittleness limits their usage scenarios and leads to reduced service life.To address this challenge,scientists in the field of materials science have developed various methods such as microbial encapsulation and fiber reinforcement modification to achieve self-healing and high strength and toughness in silicate-based ceramic functional materials.However,the random fracture characteristics of ceramic materials create a contradiction between high load and low efficiency in fiber reinforcement.Similarly,microbial modification faces drawbacks such as low survival rate,slow repair,and insufficient sustainability.The challenge is to realize the integration of continuous deployment,rapid response repair,mechanical enhancement,and toughening.To overcome these challenges,this research proposes a strategy for synergistic coconstruction and integration of silicate-based polymer composite functional materials based on a multi-component coaxial printing method.The strategy achieves the integration of in-situ self-healing,strengthening,transmittance,and other structural functions of brittle ceramic functional composite materials.Numerical simulation analysis reveals the mechanism of rapid repair and mechanical enhancement and toughening of fractured ceramics.The main research contents of this research include:(1)Developing a multi-component material integrated molding silicate composite material coaxial 3D printing method.A 3D printing platform device based on direct writing of silicate ceramic slurry and polymer repair precursor synthesis is constructed.The platform device includes a three-axis linkage control module,multichannel on-demand extrusion push unit,and multi-source coaxial nozzle,which realizes the same axis shaping and complex structural arrangement of silicate slurry and polymer by designing coaxial nozzles with different inner and outer diameter matching parameters and optimizing controllable design and printing parameters.(2)A self-healing bionic composite material preparation method is proposed based on the self-repairing bionic characteristics of biological tissue incision.The basic construction units for printing lines in the same axis are epoxy resin repair agent and silicate-based material.The fluid epoxy resin exists in a continuous embedded network surrounded by the silicate matrix.After the matrix fractures,the fluid flows into the crack and reacts with exposed curing agent molecules to repair the damage.Due to the interlocking composite system formed between the repaired epoxy resin and silicate,the maximum compressive strength after repair increases by more than 50%.Microscopic structural characterization and finite element analysis simulation demonstrate the synergistic effect of damage self-repair and synchronous strengthening and toughening.(3)Based to the "bottom-up" co-printing strategy of the dual material,the solidified epoxy resin network provides a stable and continuous pathway for light signal transmission in the bionic system with mechanical repair and reinforcement.This provides a new method path for functionalizing the transmittance of silicate-based composite materials.The results show that the ductility increases with the increase of the internal diameter of the epoxy resin light path,and the corresponding strain of the peak stress can reach about 15%,which is higher than that of a single component of ordinary silicate and epoxy resin materials.Microscopic structural characterization analysis shows that the two-phase interface between the epoxy resin and silicate materials is tightly bonded,and the printing light path is parallel and uniformly distributed.