B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
75/162, 75/1.2
B22F 3/26 (2006.01)
Patent
CA 1181615
ABSTRACT OF THE DISCLOSURE Precision molded articles, such as die-cavities, pertaining to the field of powder metallurgy, and having high hardness and impact resistance, are made by combining granules of refractory and granules of a first metal or alloy which has a homogeneous crystalline appearance at a temperature below its melting point and a lower Rockwell Hardness than the refractory, mixing the granules with organic binder, molding the granule-binder mixture into a green molded preform, thermally degrading and removing the binder to form a skeletal preform, and infiltrating the preform with a second metal or alloy which will wet the first metal or alloy and has a lower Rockwell Hardness than the first metal or alloy, thereby forming a molded article having refractory granules fully enveloped within a single skeleton of the first metal or alloy, the refractory granules and skeleton being surrounded by layers or matrices of softer metals.
376320
Dillon Kenneth R.
Gardner Richard N.
Minnesota Mining And Manufacturing Company
Smart & Biggar
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