METHOD AND APPARATUS FOR FREEZE-FORM EXTRUSION FABRICATION OF FUNCTIONALLY GRADIENT COMPOSITE PARTS

摘要

This novel technology relates to a freeze-form extrusion fabrication process for fabricating three-dimensional functionally gradient composite parts by extruding and mixing multiple aqueous pastes prior to depositing and freezing the mixed paste, layer by layer, using a computer controlled multi-extruder apparatus. Various aqueous pastes with low organic binder contents are first prepared. The extrusion of each different paste is coordinated through computer control, which mixes the pastes in any desired proportions prior to extrusion through and deposition according to a pre-programmed deposition path for each layer. The mixed paste is frozen immediately after deposition. A heating jacket may be used to prevent the pastes from freezing prior to deposition. The layer-by-layer fabrication process continues until an entire part has been fabricated.