GAS-PHASE SOLID FREEFORM FABRICATION OF SiC CERMETS USING SALDVI

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Date

2000

Authors

Crocker, James E.
Shaw, Leon L.
Marcus, Harris L.

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Abstract

Selective Area Laser Deposition Vapor Infiltration (SALDVI) is an experimental solid freeform fabrication (SFF) technique aimed at the direct fabrication of ceramic and ceramic/metal structures and composites. SALDVI uses a layer-by-layer approach in which powders are infiltrated with solid material deposited from gas precursors by chemical vapor deposition (CVD) using laser heating. Experiments have been performed with CO2 and Nd:YAG lasers using the silicon carbide forming gas precursor Si(CH3)4 and Cu, Mo, and Ni metal powders. The microstructure of the resulting SiC/metal cermets was investigated in relation to the processing history. In some cases, the formation of intermetallic silicide phases was observed

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