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US 6,524,522 B2Granted
Method for preparation of metallic foam products and products made
AssigneeAdvanced Ceramics Research, Inc.
InventorsK. Ranji Vaidyanathan, John L. Lombardi, Joseph Walish, Ronald A. Cipriani
Life of this patent
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Abstract
The present invention relates to the extrusion freeform fabrication of low cost, in situ, metallic foam components having oriented microstructures and improved mechanical properties such as energy absorption and specific stiffness. The present invention relates to the freeform fabrication of metallic foams to form parts having complex geometry that demonstrate superior mechanical properties and energy absorbing capacity.
Claims15
A method of fabricating a porous structure comprising, in combination:
- (a) blending a structure forming powder, one or more polymer binders, and an additional compound that is generally immiscible with the powder and polymer binder to provide a dispersion;
- (b) extruding the dispersion through a dispensing head;
- (c) depositing the extruded dispersion onto a working surface in a predetermined pattern to form a composite object;
- and
- (d) heating the composite object to a temperature effective for vaporizing the additional compound to provide a finished object having internal porosity.
2 more elements
A porous metallic object formed by the steps comprising:
- (a) blending a structure forming powder, one or more polymer binders, and an additional compound that is generally immiscible with the powder and polymer binder to provide a dispersion;
- (b) extruding the dispersion through a dispensing head, wherein the additional compound is present as droplets within the polymer binder and the droplets become elongated and directionally aligned during extrusion;
- (c) depositing the extruded dispersion onto a working surface in a predetermined pattern to form a composite object;
- and
- (d) heating the composite object to a temperature effective for vaporizing the additional compound and for removing the polymer binder to provide a finished object having internal porosity.
2 more elements
Dependencies are inferred from the claim text.