Infiltrated molded articles of spherical non-refractory...

B - Operations – Transporting – 22 – F

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B22F 3/26 (2006.01) B22F 1/00 (2006.01)

Patent

CA 1119847

INFILTRATED MOLDED ARTICLES OF SPHERICAL NON-REFRACTORY METAL POWDERS Abstract of the Disclosure A molded, non-refractory metal article for applications where close dimensional tolerances are desirable such as articles with intricate or complex shapes and surfaces with fine details, e.g., dental prostheses and injection molding dies is made by molding in a flexible mold a plastic mixture of non-refractory, spherical metal powders and a heat-fugitive binder comprising thermoplastic material to form a green article of predetermined shape and dimensions, heating the green article to remove said binder and consolidate the non-refractory spherical powders in the form of a porous, monolithic skeleton of necked particles of non-refractory metal, infiltrating the skeleton with a molten metal having a melting point that is at least 25°C less than the melting point of the lowest melting of said spherical, non-refractory metal particles, and cooling the infiltrated skeleton thereby forming a homogeneous, void-free, non-refractory metal article of two intermeshed metal matrices.

310810

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