High performance carbon fiber, process for production thereof, and composite materials prepared therewith
US4347279A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1981 |
| Grant date | Aug 31, 1982 |
| Priority date | — |
| Expiry date | Aug 21, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A carbon fiber, a process for production thereof, and composite materials prepared therewith are described, wherein the carbon fiber has a single yarn diameter of from 2 to 6 microns and showing a strand knot strength of 7 kilograms or more when formed into a strand of 0.4.+-.0.01 gram per meter, which comprises subjecting a 0.1 to 0.6 denier acrylonitrile-based fiber having a strength of 6 grams per denier or more to a preoxidation treatment wherein the acrylonitrile-based fiber is treated under such tension as to provide a shrinkage of at least 3% until the equilibrium water content reaches 5%, and (b) a second preoxidation treatment wherein the acrylonitrile-based fiber is treated under such tension as to provide a shrinkage of at least 1%, said preoxidation treatment is conducted in an oxidizing atmosphere having a temperature of from 240.degree. C. to 300.degree. C. while maintaining the relation between the preoxidation treatment time (t) (minutes) and average preoxidation treatment temperature (T) (.degree.C.) satisfying the equation (1): EQU (310-T).times.(0.8.about.3)=t (I) and subjecting the thus preoxidized fiber to a carbonization treatment in an inert gas maintained at…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.