Firing process for alumina yarn
US3953561A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 19, 1975 |
| Grant date | Apr 27, 1976 |
| Priority date | — |
| Expiry date | Feb 19, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/19
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for producing continuous alumina multifilament yarns which comprises preparing an aqueous spinning mix containing selected alumina particles and water-soluble precursors of alumina in selected amounts, spinning filaments from the mix, forming a continuous filament package on a collapsible, refractory bobbin at a windup speed which attenuates the filaments, firing the package in a furnace at selected temperatures in either one or two steps, and then firing the yarn while backwinding it. A bobbin is obtained which is wound with strong substantially straight yarn of at least five aligned polycrystalline .alpha.-alumina continuous filaments, which yarn can be backwound from the bobbin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.