Process for forming surface diffusion alloy layers on refractory metallic articles
US4096296A · kind A · utility
37Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1976 |
| Grant date | Jun 20, 1978 |
| Priority date | — |
| Expiry date | Mar 5, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49339
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A metal article having perforations therein whose transverse cross-sectional dimension is less than 0.4 mm has formed thereon a surface diffusion alloy by applying a refractory filter element to the workpiece surface prior to the diffusion treatment, the filter element being a refractory felt based on metal fibres including chromium in a proportion by weight of from 10 to 60%. The felt is oxidized to give a layer of chromium oxide. This is followed by conventional thermochemical powder diffusion treatment in the presence of at least one chromium oxide-reducing element selected from aluminium, yttrium, titanium and the lanthanides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.