Refractory metal oxide processes
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United States of America Patent
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Nov 28, 1989
Issued Date -
N/A
app pub date -
Feb 24, 1986
filing date -
Aug 16, 1982
priority date (Note) -
Expired
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Abstract
A process for producing a sturdy refractory metal oxide articles includes the steps of heating a substrate or organic material impregnated with a metal nitrate compound in an atmosphere in which the partial pressure of oxygen is less than two mm Hg to increase the temperature of the substrate at a rate of at least two degrees Celsius per minute to thermally decompose the metal nitrate compound as a step in the conversion of the metal nitrate compound to a refractory metal oxide such that evolved oxides of nitrogen interact with the organic substrate material to partially oxidize the organic substrate material. The impregnated substrate is then further heated in an atmosphere containing an increased amount of oxygen to decompose and remove the organic material from the impregnated substrate and to complete the conversion of the metal nitrate compound to the refractory metal oxide so that a metal oxide replica of the substrate remains; and then the metal oxide replica is further heated to sinter and strengthen the metal oxide replica such that the replica retains strength after the replica has been heated to a temperature of 1500.degree. C.
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