Method for diffusion coating a workpiece with Cr, Si, Al or B by placing coated ceramic alumino-silicate fibers next to the workpiece and heating to diffuse the diffusion coating into the workpiece
US5135777A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1991 |
| Grant date | Aug 4, 1992 |
| Priority date | — |
| Expiry date | Apr 25, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C10/18
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for diffusion coating a workpiece with chromium (Cr), silicon (Si), aluminum (Al), or boron (B) by placing coated ceramic alumino-silicate fibers next to the workpiece and heating to diffuse the diffusion coating into the workpiece. A ceramic carrier is fabricated from the alumino-silicate fibers woven into a predetermined fashion. Alternately the ceramic carrier may be an elongated ceramic carrier. The aqueous diffusion coating composition is applied to the ceramic carrier and then the ceramic carrier is heated at a temperature of between about 150.degree. F. to 250.degree. F. prior to positioning the ceramic carrier proximate a surface of the workpiece. The ceramic carrier and the workpiece are subjected to an elevated temperature in a controlled environment for a sufficient time to cause at least one diffusion element to diffuse into the workpiece to provide the diffusion coating for the external, the internal, or both surfaces of the workpiece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.