矿化剂对3D打印硅基陶瓷型芯微观结构及力学性能的影响OA

Silica-based ceramic cores exhibit excellent chemical solubility and core leaching performance,yet their inherently low mechanical strength makes them prone to cracking or deformation under the scouring of high-temperature molten metal,failing to meet the mechanical requirements of complex hollow turbine blades.This study proposes a strategy combining TiO2 mineralizer with DLP additive manufacturing to improve the densification behavior and mechanical properties of silica-based ceramics via compositional optimization.Ceramic cores with different TiO2 contents were fabricated by DLP stereolithography,and their microstructural evolution was analyzed by means of SEM,XRD and other methods,while the effect of sintering temperature on the flexural strength of ceramic cores was investigated.The results demonstrate that the addition of TiO2 can form a eutectic liquid phase with the matrix,promoting densification.The ceramic with 10wt.%TiO2 sintered at 1 300℃exhibits a significantly reduced open porosity of 14.28%±0.22%and a peak flexural strength of(65.46±1.96)MPa.The TiO2 content and the sintering temperature synergistically regulate the microstructure,and the 10wt.%TiO2 content significantly enhance the mechanical properties of the material by facilitating liquid-phase sintering.This work provides a reference basis for the compositional optimization of high-performance soluble ceramic cores.