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:
Apr. 24, 1984
Filed:
Oct. 29, 1982
Robert G Shaver, Springfield, VA (US);
Versar Inc., Springfield, VA (US);
Abstract
The process of manufacturing shaped structures comprising silicon carbide and carbon, including forming precursors of heat carbonizable synthetic resin material having dispersed therein siliceous material, heating a batch of precursors to a temperature in the range of 2000.degree. F. to 3000.degree. F. while confining them within a graphite boat which substantially surrounds the precursors except for small openings sufficient to circulate gases through the boat, maintaining the heating of the boat and the batch for a time in the range of 4 to 24 hours to carbonize the resin material and promote solid state reactions between the carbon formed from the resin material and the siliceous material, while continuously flushing the boat with inert gases, subsequently removing the heated boat containing the batch and immediately confining it in an unheated chamber in the presence of an inert atmosphere until the boat and batch are cooled below the auto-ignition temperature of carbon in air, and recovering the shaped silicon carbide and carbon structures from the boat. The product of the process forms part of this disclosure and can be further processed to remove uncombined siliceous materials by treating with hydrofluoric acid.