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. 20, 1990
Filed:
Jun. 29, 1989
Taehyun Kwon, Ithaca, NY (US);
Therm Incorporated, Ithaca, NY (US);
Abstract
Precursor suitable for conversion into silicon carbide product containing a substantial amount of silicon carbide whiskers is preferably prepared by impregnating activated carbon particles (through 100 mesh) with silicon tetrachloride dissolved in methylene chloride, then impregnating the particles with aqueous solution of transition metal salt, preferably Ni(NO.sub.3).sub.2 .multidot.6H.sub.2 O, reacting at room temperature to give carbon, hydrated silica, Ni.sup.+30 and HC1, reacting with NaOH to convert HC1 to NaCl and water and drying to remove methylene chloride and water. Molar ratios of carbon to silicon tetrachloride range from 5:1 to 10:1, of transition metal salt to silicon tetrachloride range from 1:50 to 1:200, of water to silicon tetrachloride range from 0.25:1 to 2:1, and of NaOH to silicon tetrachloride range from 0.8:1 to 2.0:1.