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:
Jan. 20, 1987
Filed:
Dec. 27, 1984
Ronald L Beatty, Greer, SC (US);
Floyd H Wyman, Mauldin, SC (US);
Atlantic Richfield Company, Los Angeles, CA (US);
Abstract
The invention features methods and apparatus for obtaining silicon carbide whiskers on a continuous basis. Rice hulls or other carbon and silicon containing feed materials are continuously fed to a conversion zone in an unagitated state in order to promote whisker growth. The conversion zone is continuously purged, preferably with an inert gas such as nitrogen. The purging gas is vented directly out of the conversion zone and carries away gaseous reaction products and impurities, prevents oxidation of the whiskers and keeps glasses from condensing and depositing on the furnace surfaces. The feed materials are fed in a dry state to the conversion zone in order to prevent erosion of the furnace walls. After conversion and cooling the whiskers are separated from the mass of particulate silicon carbide. The whiskers find use as reinforcements.