Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1992-05-26
1993-09-07
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
423346, 423440, C22B 400
Patent
active
052424790
ABSTRACT:
This invention relates to a method and apparatus for developing a metallic carbide coating on a substrate. The invention involves providing an enclosed chamber with sources of carbon in the form of a blank and an ingot of a metal material taken from the group including titanium, boron and silicon. Electron beam guns are employed to heat the carbon source causing a carbon vapor flow within the vessel. In accordance with this invention, the metal ingot is subjected to two distinct heating steps. A first heating step preferably using an electron beam gun, melts the ingot and the molten material flows onto a refractory surface where it is subjected to a second heating step, preferably also using an electron beam gun. The plural heating approach of this invention has been found to produce significant increases in metal vaporization rate, thus permitting a higher rate of formation of metallic carbide to be provided on the substrate.
REFERENCES:
patent: 3340020 (1967-09-01), Neuenschwander
patent: 3961103 (1976-06-01), Aisenberg
patent: 4153527 (1979-05-01), Greenewald
patent: 4610857 (1986-09-01), Ogawa
patent: 5131992 (1992-07-01), Church
Chevychelov Alexander A.
Decker Raymond F.
Movchan Boris A.
Paton Tek, Inc.
Rosenberg Peter D.
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