Sinterable semi-crystalline powder and near-fully dense article formed therewith

  • US 6,136,948 A
  • Filed: 07/14/1997
  • Issued: 10/24/2000
  • Est. Priority Date: 11/23/1992
  • Status: Expired
First Claim
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1. A method of producing a three-dimensional object, comprising the steps of:

  • applying a layer of a powder at a target surface, the powder comprised of a semi-crystalline organic polymer, the powder having a melting peak and a recrystallization peak, as shown in differential scanning calorimetry traces, which slightly overlap when measured at a scanning rate of 10-20°

    C./minute;

    directing energy at selected locations of the layer corresponding to the cross-section of the object to be formed in the layer, to fuse the powder thereat;

    repeating the applying and directing steps to form the object in layerwise fashion; and

    removing unfused powder from the object.

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