Preparation method of inert ceramic shell for directional or single-crystal high-temperature alloy investment casting

• Main Authors: GUO XINLI, ZHANG LING, SEKI HIROSHI, SUN XUN, WANG TAO, TENG YUJUN, ZHANG DI, LIU XIAOFU, LI WEI, JIN LEI
• Format: Patent
• Language: Chinese; English
• Published: 01.12.2023
• Subjects: CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; FOUNDRY MOULDING; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING

The invention aims to provide a preparation method of an inert ceramic shell for directional/single crystal investment casting, aiming at the problem of poor high-temperature thermochemical stability of an existing shell system. The part module obtained after oil removal and drying is immersed into the surface layer coating, then the module is taken out and slowly rotated, it is ensured that all the portions of the surface of the module are evenly covered with a layer of slurry, the module is fed into a sand spraying machine for sand spraying, and preparation of a surface layer mold shell is completed; after the module surface layer is dried, the mold shell is immersed into the transition layer slurry, and after uniform coating, the mold shell is fed into a sand spraying machine for sand spraying; and after the transition layer mold shell is dried, the mold set is immersed in the back layer slurry, sand spraying is conducted, and then the back layer slurry is used for slurry sealing. And dewaxing after the sl