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Title: Cermets and method for making same

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.

Inventors:
 [1];  [2];  [3]
  1. Clinton, TN
  2. Brentwood, TN
  3. Kingston, TN
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
864554
Patent Number(s):
US 4383855
Assignee:
United States of America as represented by United States (Washington, DC)
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
cermets; method; directed; wide; variety; general-purpose; radioactive; waste; disposal; ceramic; powders; prepared; urea-dispersed; solutions; containing; various; metal; values; formed; compact; subjected; rapid; temperature; increase; reducing; atmosphere; reduction; readily; reducible; oxides; reduced; selected; substoichiometric; below; eutectic; phase; particular; oxide; raised; provide; liquid; prior; forming; solid; forms; melting; bonds; remaining; particulates; cermet; form; polycrystalline; waste disposal; ceramic powder; metal values; ceramic powders; reducing atmosphere; melting temperature; temperature below; liquid phase; radioactive waste; solutions containing; wide variety; solid metal; rapid temperature; various metal; eutectic temperature; temperature increase; /419/75/252/976/

Citation Formats

Aaron, W Scott, Kinser, Donald L, and Quinby, Thomas C. Cermets and method for making same. United States: N. p., 1983. Web.
Aaron, W Scott, Kinser, Donald L, & Quinby, Thomas C. Cermets and method for making same. United States.
Aaron, W Scott, Kinser, Donald L, and Quinby, Thomas C. Sat . "Cermets and method for making same". United States. https://www.osti.gov/servlets/purl/864554.
@article{osti_864554,
title = {Cermets and method for making same},
author = {Aaron, W Scott and Kinser, Donald L and Quinby, Thomas C},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {1}
}

Patent:

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