The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 28, 1989
Filed:
Feb. 24, 1986
Walter J Diederich, West Newbury, MA (US);
Robert E Nelson, Weston, MA (US);
TPV Energy Systems, Inc., Waltham, MA (US);
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.