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1. (WO2018022024) THREE-DIMENSIONAL (3D) PRINTING

Pub. No.:    WO/2018/022024    International Application No.:    PCT/US2016/044095
Publication Date: Fri Feb 02 00:59:59 CET 2018 International Filing Date: Wed Jul 27 01:59:59 CEST 2016
IPC: B22F 3/105
C22C 1/04
B33Y 10/00
B33Y 30/00
Applicants: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventors: ANTHONY, Thomas
ERICKSON, Kristopher J.
NAUKA, Krzysztof
Title: THREE-DIMENSIONAL (3D) PRINTING
Abstract:
In a three-dimensional printing method example, a metallic build material is applied. A positive masking agent is selectively applied on at least a portion of the metallic build material. The positive masking agent includes a radiation absorption amplifier that is compatible with the metallic build material. The metallic build material is exposed to radiation from a spatially broad, high energy light source to melt the portion of the metallic build material in contact with the positive masking agent to form a layer. The radiation absorption amplifier i) has an absorbance for the radiation that is higher than an absorbance for the radiation of the metallic build material, or ii) modifies a surface topography of the at least the portion of the metallic build material to reduce specular reflection of the radiation off of the at least the portion of the metallic build material, or both i) and ii).