Patent ID: 8968624
Filing Date: 2015-03-03
Classification: B22F,B28B,B29C,B33Y,C04B,Y02P

Abstract:
1. A method for producing a three dimensional green article comprising: (a) providing a slurry composition that contains an inorganic powder, a binder, and a solvent; (b) forming a slurry layer made of the slurry composition; (c) removing the solvent of the slurry layer from an upper surface of the slurry layer so as to form the slurry layer into a green layer with a plurality of pores, the pores being interconnected and fluidly communicated with an upper surface of the green layer; (d) scanning the green layer along a predetermined line-shaped first scanning path with an energy beam having a power sufficient to vaporize or burn the binder such that the vaporized binder or burnt binder escapes from the green layer through the pores, while leaving the inorganic powder which is not bound by the binder, wherein a scanned part of the green layer forms a first sacrificial region along the first scanning path, and an un-scanned part of the green layer is divided into a workpiece portion and a waste portion, the workpiece portion and the waste portion being separated from each other by the first sacrificial region; and (e) repeating steps (b) to (d), in which a plurality of green layers are formed one over the other and are scanned one after the other via multiple scanning steps.