基于直写成型的仿生结构氧化铝基陶瓷型芯的制备及其性能研究OA

To address the problems of conventional ceramic-core fabrication's inability to a-chieve high-precision forming of complex structures,and the issue of the low leaching effi-ciency of alumina-based ceramic cores,biomimetic vascularstructured alumina ceramic cores were fabricated via direct ink writing,and the key process parameters were systematically in-vestigated.Under optimized conditions,printing pressures of 25 Psi and 35 Psi,a nozzle inner diameter of 0.41 mm.printing speeds of 20 mm·s-1 and 25 mm·s-1,and a layer height of 0.5 mm,both threelayer and fourlayer ceramic cores satisfy the roomtemperature flexural strength requirements,with the flexural strength of fourlayer ceramic cores(Sample 2)a-chieving 15.84 MPa.Total porosities exceeding 30％(45.14％for the threelayer and 43.24％for the fourlayer structures)provide an optimal balance between mechanical integri-ty and leachability.Leaching tests demonstrate that the biomimetic channel architecture en-hances alkali infiltration and increases reactive surface area,resulting in a leaching rate of 0.133 1％·h-1,significantly outperforming both sandwich and solid configurations.Re-search demonstrates that biomimetic vascular alumina-based ceramic cores are obtained by di-rect ink writing,which achieves high-precision molding of complex structures while maintai-ning excellent mechanical properties and leaching efficiency.This results present a novel process for applications such as aircraft engine blades.