05156697 is referenced by 153 patents and cites 15 patents.

A method and apparatus for selectively sintering a layer of powder to produce a part comprising a plurality of sintered layers. The apparatus includes a computer controlling a laser to direct the laser energy onto the powder to produce a sintered mass. The computer either determines or is programmed with the boundaries of the desired cross-sectional regions of the part. For each cross-section, the aim of the laser beam is scanned over a layer of powder and the beam is switched on to sinter only the powder within the boundaries of the cross-section. Powder is applied and successive layers sintered until a completed part is formed. Preferably, the powder comprises a plurality of materials having different dissociation or bonding temperatures. The powder preferably comprises blended or coated materials, including precursor materials which are formed into a mass at the irradiated locations, and which either react due to the laser thermal energy or in a later heat treatment to form a compound with properties different than the precursors. Examples are disclosed wherein a compound is formed which has a significantly higher melting point than that of one or more of the precursor powders.

Title
Selective laser sintering of parts by compound formation of precursor powders
Application Number
402694
Publication Number
5156697
Application Date
December 7, 1990
Publication Date
October 20, 1992
Inventor
Wendy L Weiss
Socorro
NM, US
Harris L Marcus
Austin
TX, US
David L Bourell
Austin
TX, US
Agent
Vinson & Elkins
Assignee
Board of Regents The University of Texas System
TX, US
IPC
B29C 67/00
B23K 9/00
B32B 31/00
B27N 3/00
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