Edm electrode with carbon and refractory material skeleton...

Details Edm electrode with carbon and refractory material skeleton... Edm electrode with carbon and refractory material skeleton...

B - Operations, Transporting

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25/139, 204/196

B23H 1/06 (2006.01) B22F 5/00 (2006.01)

Patent

CA 1159014

ABSTRACT OF THE DISCLOSURE A precision molded electrical discharge machining (EDM) electrode pertaining to the field of powder metallurgy. The electrode is made by shaping a preform from granules of carbon and granules of a refractory material selected from the group consisting of tungsten, molybdenum, carbides thereof, and stoichiometric and hyperstoichiometric carbides of the other elements of the groups IVB, VB, and VIB of the Periodic Table of the Elements, the carbon and refractory granules being inter- connected in the form of a skeleton at their contiguous points of contact, and infiltrating the preform with copper, silver, or alloys containing those metals. Despite the inability of most infiltrants to wet carbon, infiltration of the preform at ambient pressure is carried out by selecting the amount and surface area of carbon and refractory granules used in the preform according to a prescribed relationship.

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