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Surface modified particulate and sintered or injection molded products

  • US 10,456,836 B2
  • Filed: 10/12/2016
  • Issued: 10/29/2019
  • Est. Priority Date: 07/11/2013
  • Status: Active Grant
First Claim
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1. A method of making a shaped metal or inorganic object with an additive manufacturing system, the method comprisesdepositing successive layers of a filament on a build bed or a platform;

  • forming a shape from a digital model, the system comprising a digitally controlled applicator, in a controlled x-y plane with z-direction filament application to obtain a preform object;

    the filament comprising a composite of about 70 to 1 wt. % of a thermoplastic polymer; and

    about 99 to 30 wt. % of a particulate, dispersed in the polymer, the particulate having a particle size of less than 500 microns and an exterior coating of interfacial modifier on the particulate in an amount of about 0.02 to 2.0 wt. %, all percentages based on the weight of the composite; and

    sintering the preform object to remove the polymer and to bond the particulate forming the shaped metal or inorganic object;

    wherein the particulate comprises a metal alloy particle, an inorganic particle, a ceramic particle, a bi-metal particle or blends thereof.

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