Fundamental requirements for sand core properties include strength, storage properties, erosion and penetration resistance, chemical resistance to the cast metal, gas permeability, easy decoring, recyclability, and environmental friendliness. In metal casting, removable cores are used to shape the internal cavities of cast components. Slurry-Based 3D Printing in Comparison to Conventional 3D Printing of Sand Cores Since the mean roughness depth Rz is determined to be <30 µm in plane, an application of slurry-based 3D printing in investment casting is conceivable.ġ.1. At layer heights of 75 µm, bending strengths between ~8 and 11 MPa as well as densities of around 50% of the theoretical density were achieved.

Within this study, a process window applicable for 3D printing of sinterable casting cores is identified and further indications are given for optimization potentials. The drying intensity influenced by an IR heater as well as the drying periods are varied for layer thicknesses of 50, 75, and 100 µm. This study aims at contributing to a better understanding of the interrelations between the drying conditions in the 3D printing process and the properties of sintered specimens relating thereto. This paper presents a study of the slurry-based fabrication of ceramic layer compounds focusing on the drying process and the achievable properties in slurry-based 3D printing of casting cores. The process of slurry-based 3D printing allows the fabrication of dense structures and therefore sinterable casting cores. However, improving the properties of chemically bonded casting cores regarding temperature stability, bending strength, and surface quality is still a major challenge. Additive manufacturing of casting cores and molds is state of the art in industrial application today.

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