Production of metal ion containing carbon fibers useful in electron shielding applications
US3997638A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1974 |
| Grant date | Dec 14, 1976 |
| Priority date | — |
| Expiry date | Sep 18, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/19
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An improved process is provided for the formation of metal ion containing carbon fibers which particularly are suited for utilization in electron shielding applications. An acrylic fibrous material is formed having substantially uniformly dispersed therein a halide of a transition metal. The metal halide (e.g. a chloride) present within the fibrous material is (1) converted to an oxide, (2) the fibrous material containing the metal oxide is heated in an oxygen-containing atmosphere until thermally stabilized, and (3) the thermally stabilized fibrous material is carbonized or carbonized and graphitized at a more highly elevated temperature in an appropriate atmosphere. The resulting product comprises ions of a transition metal substantially uniformly dispersed in an amorphous carbon or graphitic carbon matrix. The halide of a transition metal may be incorporated into the acrylic precursor by co-spinning and/or padding prior to thermal stabilization. The conversion of the halide of a transition metal to an oxide prior to thermal stabilization may be conducted by contact with a base or with an oxidizing agent as described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.