Production of high tenacity graphitic fibrous materials
US3954950A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1973 |
| Grant date | May 4, 1976 |
| Priority date | — |
| Expiry date | Apr 25, 1993 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F9/22
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process is provided for the efficient conversion of acrylonitrile homopolymer fibrous materials and closely related acrylonitrile copolymer fibrous materials to graphitic fibrous materials of high tenacity. The process incorporates an initial brief fiber healing step which is conducted at a temperature of about 170.degree. to 220.degree.C., a preoxidation step, and a tandem carbonization/graphitization step as described. The relationship of the various variables required to produce the high tenacity graphitic fibrous product is set forth in the equation provided. In a preferred embodiment of the invention the carbonization/graphitization step of the process is conducted on a reliable and stable basis wherein the desired tenacity is achieved without the necessity of resorting to the exertion of high longitudinal tensions upon the preoxidized acrylic fibrous material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.