Process of making a spring member
US5503783A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1994 |
| Grant date | Apr 2, 1996 |
| Priority date | — |
| Expiry date | Jun 1, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2237/385
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A spring member made of a carbon fibers/carbon composite material in which carbon fibers are dispersed in a matrix of graphite, and a process for producing such a spring member. The process includes the steps of: (a) forming raw preformed yarns; (b) shaping the raw preformed yarns in a form of a yarn member, a taper member or a sheet member; (c) coiling the thus shaped member around a core rod together with a coiling spacer; (d) molding the coiled member by hot pressing at about 300.degree. C.-2000.degree. C. under a given pressurized pressure; and graphitizing the coiled member at 1500.degree. C.-3000.degree. C., after carbonizing at 700.degree.-1200.degree.C. if necessary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.