Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1986-02-24
1989-11-28
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
264 65, 264 66, 264221, 264317, C04B 3332
Patent
active
048836192
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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Diederich Walter J.
Nelson Robert E.
Derrington James
TPV Energy Systems, Inc.
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