Method for producing an object by melting a polymer powder in a powder sintering device
AssigneeArkema France
InventorsBenoît BRULE, Nadine DECRAEMER
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Abstract
A method for producing an object by melting a polymer powder in a powder sintering device. For example, a method for producing an object by melting a polymer powder in a powder sintering device under a laser beam, implementing a rheological analysis of the polymers, in order to determine the conditions for producing the object by melting polymer powders.
Claims10
A process for manufacturing an object by melting a polymer powder in a laser-beam powder sintering device comprising the following steps:
- manufacturing the object in a laser-beam powder sintering device at the initial temperature of the powder bed, said initial temperature of the powder bed being selected in the following manner:
- establishing the viscosity behavior of the polymer powder as a function of the time and of a descending temperature gradient starting from a supercooling temperature, corresponding to the temperature of the powder bed, that the layer melted at T>Tm by the laser rapidly returns to via cooling, the viscosity measurements being carried out in a plate-plate rheometer device at a stress frequency of less than 5 rad/s.
- selecting the initial temperature corresponding to the temperature of the powder bed allowing a viscosity of the supercooled polymer of between 800 and 20 000 Pa·s during a time range of more than 5 minutes.
A composition comprising a semicrystalline polymer having a viscosity of between 800 and 20 000 Pa·s, the viscosity measurements being carried out in a plate-plate rheometer device at a stress frequency of less than 5 rad/s, said composition being supercooled to a temperature T below the melting temperature after exposure to a temperature T max above its melting point and that can be used in a device for manufacturing objects by melting polymer powders.
Dependencies are inferred from the claim text.