Method and device for producing a multi-material workpiece

A device for producing a three-dimensional workpiece, which device comprises:

• a powder application device, which is adapted to apply a first and a second raw material powder to a substrate,
• an irradiation apparatus, which is adapted to selectively irradiate a raw material powder layer applied to the substrate with electromagnetic radiation or particle radiation,
• a removal apparatus, which is adapted to remove non-solidified first raw material powder from the substrate,
• a heating apparatus, which is adapted to heat a raw material powder layer applied to the substrate, and
• a control unit, which is adapted to control the operation of the device in such a way that
• (i) the first raw material powder is applied to the substrate by means of the powder application device in order to produce a raw material powder layer consisting of the first raw material powder,
• (ii) the raw material powder layer consisting of the first raw material powder is selectively irradiated with electromagnetic radiation or particle radiation by means of the irradiation apparatus in order to produce a solidified first workpiece layer portion from the first raw material powder,
• (iii) non-solidified first raw material powder is removed from the substrate by means of the removal apparatus,
• (iv) the second raw material powder is applied to the substrate by means of the powder application device in order to produce a raw material powder layer portion consisting of the second raw material powder adjacent to the first workpiece layer portion,
• (v) the raw material powder layer portion is selectively irradiated with electromagnetic radiation or particle radiation by means of the irradiation apparatus in order to produce a solidified second workpiece layer portion from the second raw material powder adjacent to the first workpiece layer portion, and
• (vi) non-solidified second raw material powder is heated by means of the heating apparatus in order to produce a continuous porous sintered layer portion from the second raw material powder adjacent to the first workpiece layer portion and the second workpiece layer portion.