PA 12 powder for use in a generative layer-wise manufacturing method

摘要

A powder mixture is described, which is suitable for a layer-wise manufacturing of a three-dimensional object by solidifying a building material in powder form. The powder mixture consists of a mixture of a first polyamide 12 powder and a second polyamide 12 powder, wherein the first polyamide 12 powder is characterized by an increase of its viscosity number determined in accordance with ISO 307 that is less than 10%, when the powder is exposed for 20 hours to a temperature that lies 10° C. below its melting temperature under nitrogen atmosphere, and the second polyamide 12 powder is characterized by an increase of its viscosity number, determined in accordance with ISO 307, by 15% or more, when the powder is exposed for 20 hours to a temperature that lies 10° C. below its melting temperature under nitrogen atmosphere.

主权项

1. A powder mixture that is suitable for manufacturing a three-dimensional object by a layer-wise solidification of a building material in powder form at positions in each layer that correspond to the object by means of the action of electromagnetic radiation or particle radiation, the powder mixture comprising a mixture of a first polyamide 12 powder and a second polyamide 12 powder,
wherein the first polyamide 12 powder having an increase of its viscosity number determined in accordance with ISO 307 by less than 10%, when the powder is exposed for 20 hours to a temperature that lies 10° C. below its melting temperature under nitrogen atmosphere, wherein the second polyamide 12 powder having an increase of its viscosity number determined in accordance with ISO 307 of 15% or more, when the powder is exposed for 20 hours to a temperature that lies 10° C. below its melting temperature under nitrogen atmosphere, and wherein the proportion of the first polyamide 12 powder in the mixture with the second polyamide 12 powder lies between about 10 and about 23 weight-%.