Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1981-04-01
1983-05-17
Hunt, Brooks H.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
75 05BC, 75 05AC, 252640, B22F 916, B22F 300, C22C 4300, C22C 2900
Patent
active
043838553
ABSTRACT:
The present invention is directed to a method for making a wide variety of general-purpose cermets and for radioactive waste disposal from ceramic powders prepared from urea-dispersed solutions containing various metal values. The powders are formed into a compact and subjected to a rapid temperature increase in a reducing atmosphere. During this reduction, one or more of the more readily reducible oxides in the compact is reduced to a selected substoichiometric state at a temperature below the eutectic phase for that particular oxide or oxides and then raised to a temperature greater than the eutectic temperature to provide a liquid phase in the compact prior to the reduction of the liquid phase forming oxide to solid metal. This liquid phase forms at a temperature below the melting temperature of the metal and bonds together the remaining particulates in the cermet to form a solid polycrystalline cermet.
REFERENCES:
patent: 4072501 (1978-02-01), Quinby
ORNL/TM-6404, "Cermet High Level Waste Forms", W. S. Aaron et al., ORNL, Oak Ridge, TN, (1978).
Cermets, J. R. Tinklepaugh, Reinhold Publishing Company, N.Y., (1960), pp. 54-55.
Fundamental Principles of Powder Metallurgy, W. D. Jones, Edward Arnold Publishers, London, (1960), p. 468.
Aaron W. Scott
Kinser Donald L.
Quinby Thomas C.
Besha Richard G.
Brookes Anne
Carter Clay C.
Hamel Stephen D.
Hunt Brooks H.
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