Preparation of Si-Zr-B non-catalytic nucleation compound coating mold

作者：Liu F^*; Guo X F; Yang G C

来源：Chinese Journal of Materials Research, 2000, 14(6): 599-603.

• Noncatalytic nucleation
• Single crystal superalloy

Using SiO2 glassdust and ZrO2 powder as refractory material, SiO2-ZrO2 sol as binder and H3BO3 as softening agent, a Si-Zr-B substrate layer Z was prepared on inner surface of the mold by adopting investment casting technique. The seven layers of Si-Zr-B thin film coating, were compounded with the substrate layer Z by using sol-gel processing. After glassing treatment at 850°C for 60 min, this thin film transformed into glass coating R. After the Z-R the coating mold was treated at temperature of 1500°C for 30 min, the inhibited the crystallization of Si-Zr-B (Z-R) coating seriously. The undercooling experiment shows that high undercooling of DD3 single crystal superalloy, 140 K, is achieved in this coating mold. The Si-Zr-B (Z-R) coating has ideal high temperature structure stability and non-catalytic nucleation property.

• 出版日期2000