Evonik Operations Gmbh

Evonik Degussa Gmbh

Evonik Industries Ag

Evonik Operations Gbmh

Wolfgang Diekmann

Maik Grebe

Sylvia Monsheimer

Franz-Erich Baumann

Sigrid Hessel-Geldmann

Kristiane Warnke

Beatrice Küting

Juergen Kreutz

Wolfgang Christoph

Stefan Altkemper

Heike Stemmer

Harald Haeger

Maximilian Gruhn

Harald Häger

Jürgen Kreutz

Sigrid Hessel

Franz Erich Baumann

Beatrice Kueting

Andreas Baptista

Marco Gensheimer

Adam Mondrzyk

A polyamide powder for selective absorbing sintering, SAS, or selective inhibition sintering, SIS. The polyamide powder has a solution viscosity to ISO 307 of 1.8 to 2 and a rise in the solution viscosity of 0% to 25% when it is subjected to a temperature 20° C. below its melting temperature under air for 20 hours.

Polyamide powder for selective sintering methods

A polymer composition can be used for selective absorbing sintering, SAS, or selective inhibition sintering, SIS. The polymer has open mesopores and the cumulative pore volume distribution of the mesopores, measured to DIN 66134, is at least 0.01 cm/g.

Polymer composition for selective sintering methods

A device produces three-dimensional objects layer by layer in a powder bed fusion process. The device includes a building space, at least one energy source, a building area with a building space platform and a building space container laterally confining the building space platform. The building space platform has an upper side, facing a powder, and an underside, facing away from the powder. The upper side of the building space platform includes a material with a thermal conductivity of at least 20 W/(m&#xb7;K) and the underside of the building space platform includes a material with a thermal conductivity of a maximum of 0.5 W/(m&#xb7;K). The contact surface of the upper side of the building space platform with respect to the powder or with respect to the cooling medium is raised by at least 20% in comparison with the planar surface of a building space platform.

Device for producing three-dimensional objects layer by layer

A process for melting/sintering powder particles for layer-by-layer production of three-dimensional objects is performed by a) applying a layer of a powder material solidifiable under the action of electromagnetic radiation, b) heating the powder material to not more than 10 K below the melting point according to DIN 53765 by a radiation from a heat-radiating element whose maximum radiation intensity is at a wavelength of 5000 nm or at longer wavelengths, c) selective melting/sintering of at least a region of the powder material which corresponds to the cross section of the three-dimensional object, d) repeating steps a) to c) until the three-dimensional object is obtained.

Process for melting/sintering powder particles for layer-by-layer production of three-dimensional objects

A polymer powder having a surface energy of less than 35 mN/m is suitable for melting/sintering powder particles for layer-by-layer production of three-dimensional objects.

Polymer powder having low surface energy for powder bed fusion methods

A polymer composition can be used in selective absorbing sintering, SAS, or selective inhibition sintering, SIS, methods. The polymer of the polymer composition has open mesopores, where a cumulative pore volume distribution of the mesopores, measured according to DIN 66134, is at least 0.01 cm/g.

A polyamide powder for selective absorbing sintering, SAS, or selective inhibition sintering, SIS. The polyamide powder has a solution viscosity to ISO 307 of 1.8 to 2 and a rise in the solution viscosity of 0% to 25% when it is subjected to a temperature 20&#xb0; C. below its melting temperature under air for 20 hours.

A polymer powder which is suitable for a powder bed fusion method contains a polymeric material coated with a hydrophobic substance that is at least one selected from the group consisting of a saturated fatty alcohol, an unsaturated fatty alcohol, a saturated fat, an unsaturated fat, a wax, a lactam, an alkene, and an alkane.

Polymer powder for powder bed fusion methods

Composite particles comprising core particles completely or partially coated with a precipitated polymer, where the dmedian diameter of the core particles is from 3 to 100 &#x3bc;m and wherein the glass core particle material is at least one selected from the group consisting of a solid glass bead, a hollow glass bead, a porous glass bead, and a foamed glass particle. A method to prepare the particles includes dissolution of a polymer in a solvent and precipitation of the polymer in the presence of a suspension of the core glass particles. Further provided is a layer by layer moulding process employing the composite particles and mouldings obtained therefrom.

Powder comprising polymer-coated glass particles

A process for melting/sintering powder particles for layer-by-layer production of three-dimensional objects is performed by a)applying a layer of a powder material solidifiable under the action of electromagnetic radiation, b) heating the powder material to not more than 10 K below the melting point according to DIN 53765 by a radiation from a heat-radiating element whose maximum radiation intensity is at a wavelength of 5000 nm or at longer wavelengths, c) selective melting/sintering of at least a region of the powder material which corresponds to the cross section of the three-dimensional object, d)repeating steps a) to c) until the three-dimensional object is obtained.

Composite particles comprising core particles completely or partially coated with a precipitated polymer, where the dmedian diameter of the core particles is 1 &#x3bc;m or greater and the ratio of the dmedian diameter of the composite particles to the dmedian diameter of the core particles is 1.15 or greater, are provided. A method to prepare the particles includes dissolution of a polymer in a solvent and reprecipitation of the polymer in the presence of a suspension of the core particles. Further provided is a layer by layer moulding process employing the composite particles and mouldings obtained therefrom.

Powder comprising polymer-coated core particles comprising metals, metal oxides, metal nitrides or semimetal nitrides

Disclosed herein is a polymer powder containing a polyamide of AB type, produced by polymerizing at least one lactam having from 10 to 12 carbon atoms in a monomer unit or by polycondensing at least one corresponding &#x3c9;-aminocarboxylic acid having from 10 to 12 carbon atoms in a monomer unit, and a polyamide of AABB type, produced by polycondensing at least one diamine and at least one dicarboxylic acid having respectively from 10 to 14 carbon atoms in monomer units. The polyamide of the AB type and the polyamide of the AABB type are prepared separately and then coprecipitated to form the polymer powder, and the polymer powder is a physical mixture of the polyamide of the AB type and the polyamide of the AABB type. Also disclosed herein is a method for producing the polymer powder.

Polyamide-based polymer powder, use thereof in a molding method, and molded articles made from said polymer powder

An apparatus for heating powder particles, contains a radiation source (), a housing () and a screen (). The radiation source () has its maximum radiative power in the wavelength range of 0.78-2.5 &#x3bc;m. The screen () has an absorbance of at least 0.8 in the wavelength range of 0.78-2.5 &#x3bc;m.

Apparatus for heating polymeric powders by means of radiation in powder coating methods

Composite particles comprising core particles completely or partially coated with a precipitated polymer, where the dmedian diameter of the core particles is from 1 to 70 &#x3bc;m and wherein the core particle is an inorganic material which does not include titanium dioxide are provided. A method to prepare the particles includes dissolution of a polymer in a solvent and precipitation of the polymer in the presence of a suspension of the core particles. Further provided is a layer by layer moulding process employing the composite particles and mouldings obtained therefrom.

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Waltrop, Germany

Wolfgang Diekmann