Effect of nonuniform sintering on mechanical and thermal properties of silica-based ceramic cores

Abstract

Single crystal gas turbine blades and vanes, which have complex hollow structures, are one of the most important parts in gas turbine engines. The single crystal microstructure can efficiently enhance the heat bearing capacity of turbine blades so as to improve engine performance [1] . The most efficient technology for manufacturing single crystal turbine blades is the investment casting process based on Bridgman's directional solidification theory. This technology uses complex ceramic cores fabricated by injection molding to form the internal cooling passages in the hollow gas turbine blade [2,3] . A silica-based ceramic core is typically used in the manufacture of single crystal hollow turbine blades due to its superior low thermal expansion coefficient (0.55×10 -6 K -1 between 25 °C and 1,000 °C), excellent chemical stability with molten metals, and

Effect of sintering temperature on microstructure and properties of 3D printing polysilazane reinforced Al2O3 core

“…Therefore, the high precision of ceramic cores has been the goal of industry and academy. Conventional processes, such as hot-press moulding and gel film casting, are mature and high efficiency for ceramic cores with simple structures [6][7][8] .…”