EP 0374925 A3 19910925 - HIGH DENSITY GRAPHITE FIBER AND METHOD OF MANUFACTURE THEREOF
Title (en)
HIGH DENSITY GRAPHITE FIBER AND METHOD OF MANUFACTURE THEREOF
Publication
Application
Priority
JP 32439788 A 19881222
Abstract (en)
[origin: EP0374925A2] A graphite fiber derived from an acrylic fiber having a fiber density of not less than 1.93 g/cm<3>, a strand tensile strength of not less than 350 kgf/mm<2>, and a strand tensile modulus of not less than 53x10<3> kgf/mm<2>, and a method for producing the grpahite fiber by carbonizing a preoxidized fiber derived from an acrylic fiber and having a fiber density of from 1.32 to 1.40 g/cm<3> to obtain a carbon fiber having a nitrogen content of not less than 1.0% by weight based on the carbon fiber weight, a fiber density of not less than 1.79 g/cm<3> and an orientation of not less than 79% at a maximum diffraction at 2 theta =25.3+/-0.5 DEG in X-ray diffraction angle of the (002) plane of the graphite crystal, and graphitizing the thus-obtained carbon fiber in an inert gas at a temperature of not lower than 2,400 DEG C and under a tension to stretch the fiber at least 3% during the graphitization.
IPC 1-7
IPC 8 full level
D01F 9/22 (2006.01)
CPC (source: EP)
D01F 9/22 (2013.01)
Citation (search report)
- [A] EP 0159365 A1 19851030 - MITSUBISHI RAYON CO [JP]
- [A] EP 0100410 A2 19840215 - TORAY INDUSTRIES [JP]
- [A] US 3454362 A 19690708 - SPRY WILLIAM J
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0374925 A2 19900627; EP 0374925 A3 19910925; EP 0374925 B1 19950308; DE 68921581 D1 19950413; DE 68921581 T2 19950817
DOCDB simple family (application)
EP 89123668 A 19891221; DE 68921581 T 19891221