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:
Dec. 24, 1996
Filed:
Aug. 29, 1995
Yoshio Soda, Yokohama, JP;
Takefumi Kohno, Yokohama, JP;
Masaaki Shinagawa, Yokohama, JP;
Noriyuki Kiuchi, Yokohama, JP;
Nippon Oil Co., Tokyo, JP;
Abstract
A method for preparing a carbon/carbon composite material which is characterized in that a carbon preform is impregnated with a carbonaceous pitch exhibiting a densification parameter of 0.1 or more, said densification parameter being represented by the following formula (1), and then subjected to an isotactic compression at a pressure higher than the atmospheric pressure but not higher than 10 Kgf/cm.sup.2 and at a sintering temperature of 250.degree. to 3,000.degree. C., thereby densifying the carbon preform: Densification parameter={(Weight of a sintered carbonaceous pitch (hereinafter, referred to simply as a sintered product) to be obtained through a process where a carbonaceous pitch in an open-type container is heated from room temperature up to 1000.degree. C. at a rate of 2.degree. C./min., and then sintered for 2 hours at 1000.degree. C. under isotactic compression of 9.5 Kgf/cm.sup.2)}/(Weight of a carbonaceous pitch before being sintered).times.{(Bulk density of the sintered product in the open-type container)/(True density of the sintered product)}. . . (1).