浸渗处理对黏结剂喷射增材制造可溶性陶瓷芯强度和可溶性的影响

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Abstract：Alumina-based ceramic cores were obtained using binder jetting technology，with alumina as the raw material and potassium phosphate salt as the dry binder.After impregnation with nano-silica dispersion and saturated potassum phosphate solution respectively and sintering，the effects of impregnation time and type of impregnation liquid on the performance of ceramic cores were studied. Research has found that appropriately extending the impregnation time can improve the performance of ceramic cores. When the impregnation time is increased from 1 minute to 2 minutes， the bending strength increases from 6.71MPa to 8.16MPa .However，when the impregnation timeisincreased from 2minutes to 3minutes，the bending strength dropsto 7.33MPa ，indicatingadeclineinthe performance of the ceramic core.After impregnation with nano-silica dispersion，a mulite phase sintering neck was formed inside the ceramic core during the sintering process.This structure enables the ceramic particles to be closelyconnected，therebyefectively enhancing the bending strength.The bending strength of theceramic sample is 216.04% of that without impregnation treatment，but the ceramic core sintered by this method cannot break apart. The bending strength after impregnation with saturated potassium phosphate solution was 384.91% of that without impregnationtreatment.Potassium phosphatesalteffectivelyfiled the pores between theparticles insidetheceramic core， making the microstructure extremely dense and greatly improving the bending strength of the ceramic core. Moreover，the ceramic core samples impregnated with saturated potassum phosphate solution began to disintegrate after being immersed in hot water for 3O minutes. It shows good solubility.

Keywords： binder jeting; impregnation treatment; soluble ceramic cores;strength; collpsibility

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随着航空技术的快速发展，对发动机性能的要求日益苛刻，其核心部件涡轮叶片、机匣等通常采用复杂内腔冷却结构的空心设计[1，2]。（剩余6556字）