Patent ID: 9381564
Filing Date: 2016-07-05
CPC Classification: B22C,B33Y

Claim Text:
1. A method forming a 3-D printed hydraulically bonded casting shell, the method comprising: forming at least one core casting shell by intermittently applying in a step-wise manner, a layer of a powder component comprising in part at least 25 percent by weight of a calcium aluminate cement in a predetermined area, and a volume of a liquid component comprising at least 50 percent by weight of a distilled water over the top of the powder component in a predetermined location, hardening the at least one core casting shell to form an at least one solid core casting shell comprising a plurality of hydraulic bonds at a location of overlap between the powder component and liquid component, wherein the solid core casting shell has an exterior surface that corresponds to a shape of a void in an object to be cast; and wherein the at least one core casting shell comprises at least a first shell portion and a second shell portion, and the hydraulic bonds of the first shell portion are stronger than the hydraulic bonds of the second shell portion.