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:
Jul. 13, 1999
Filed:
Jan. 21, 1998
Keihachiro Nakajima, Yokohama, JP;
Hitoshi Kato, Nakano-ku, JP;
Kaoru Okada, Kashiwa, JP;
Ryoji Kubo, Shinjuku-ku, JP;
OJI Paper Co., Ltd., Tokyo, JP;
Abstract
A process for producing silicon carbide fibers is provided, comprising the steps of mixing a silicon supply source powder including a mixture of silicon powder and silicon dioxide powder having a molar mixing ratio of 1:0.1 to 1:2 with activated carbon staple fibers having a length of 0.1 to 50 mm and a fiber thickness of 1 to 20 .mu.m and a specific surface area of 300 to 2000 m.sup.2 /g determined by the BET nitrogen absorption method; and heating the resultant mixture at a temperature of 1200 to 1500.degree. C. to directly convert the activated carbon staple fibers, in an atmosphere substantially free from substances reactive with carbon, silicon, silicon oxides and silicon carbide at the above mentioned temperature, to silicon carbide fibers.