Process for the production of carbon fibres which are vapor-deposited from methane
US4770867A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1986 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Jan 9, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y30/00
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
The invention concerns a process for the production of vapor-deposited carbon fibres wherein a gaseous or vaporized hydrocarbon which is entrained by a carrier gas is pyrolyzed on a substrate in a flow reactor at a temperature of between 950.degree. and 1300.degree. C. in two successive stages, a germination stage and a growth stage. The process comprises the following steps: PA0 preparing a gaseous mixture comprising from 50 to 90% and preferably from 85 to 65% by volume of hydrogen and/or helium and from 10 to 40% and preferably from 15 to 35% by volume of methane; PA0 circulating the mixture in the reactor over a substrate comprising from 10.sup.-8 to 10.sup.-4 g/cm.sup.2 of a catalyst selected from iron, nickel, cobalt and alloys thereof; PA0 initiating germination and growth of the carbon fibres in respect of length at a temperature t1 which is stabilized at between 950.degree. and 1050.degree. C., with a substantially constant velocity of the gaseous mixture of between 10 and 50 centimeters per minute for a period of between 10 and 90 minutes; PA0 causing growth of the carbon fibres in respect of diameter at a temperature t2 which is higher than 1050.degree. C. and which can …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.