Cermets and method for making same

Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product

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Details

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.

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