Producing parts by compound formation of precursor powders

Details Producing parts by compound formation of precursor powders Producing parts by compound formation of precursor powders

B - Operations, Transporting

29

C

B29C 67/00 (2006.01) B22F 3/105 (2006.01) B22F 3/23 (2006.01) B23K 26/34 (2006.01) B28B 11/24 (2006.01) C04B 35/64 (2006.01) B32B 31/12 (1990.01)

Patent

CA 2095140

2095140 9210343 PCTABS00013 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.

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