Abstract
Ceramic shell with complex structure for precision casting was successfully fabricated by the digital light processing (DLP) 3D printing method. A calcined kaolin (Al2O3.2SiO2) suspension with a solid loading of 45 vol% for 3D printing was prepared by using UV-curable resin as a binder. The experimental results show that the suspension displayed a shear-thinning fluid characteristic, which was suitable for 3D printing. After being printed and subsequently sintered at 1200 ℃, the porosity, relative density and transverse rupture strength of the shell were 24.5%, 2.08 g cm3 and 9.98 MPa, respectively. A stainless steel impeller with four curved blades was successfully casted by using the 3D printed ceramic shell.
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